Buzzing Noise After Turning Car Off

Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. Power steering system or the suspension is the reason for creating noise at low-speed turning. Yesterday i was spraying Meguiar's plastic/dash protectant on the steering wheel and all over the dash. When I’m turning the car around (so mid to hard turning), it sounds like a goose squawking underneath the car. Shortly after the fan turns on, the air conditioner should turn on and begin cooling the air. A humming, grinding or hissing car noise can end up costing you. As I said, the noise usually stops on its own after a little while anyway, so I can eventually turn the brightness up as far as I need with nothing in addition to the regular sounds of my laptop. Why does my HVAC make noise even when it's off? Discussion in 'E90/E91 and you will also hear noises from the HVAC when you turn the car off after a minute or two. What is that wind noise on my Subaru and how can I make it stop! One of the typical things that will happen to your Subaru is over time you will hear an increased amount of wind type noise coming into the cabin area of the car especially at freeway speeds. After driving a Land Rover for a while, you start to feel in tune with the vehicle. The "hours after" throws me a bit, BUT the whine/cooling fan noise is probably the after engine shut down turbo cooling pump. If i tap the gas pedal, the sound briefly goes away, and then starts up again. You hear the engine running after you turn off the ignition: Your engine is dieseling. Here’s a video that indicates wheel bearing noise. My car is perfectly quiet after the work was done. I don't hear anything when the car is cold but, after a few minutes, the car makes a low pitched humming sound when it's idling. Meanwhile, when the low pass knob is turned all the way to 60, there is no noise when the volume is set to zero as the cd plays. Upon entering garage about 4 hours later I heard this buzzing noise and isolated it to the rear underside of the car near the trunk. And then, something doesn't feel quite right. It seems to be on the left side of the engine. I have been very careful to be sure the radio, heater and lights are off to see if the sound stops. At least once, I tapped the gas and the sound stopped and stayed gone for a few minutes, and then came back. a noise coming from that part of truck. The first sign is noises when you turn. I hear the cooling fan on for maybe two minutes after I turn the car off. This condition only happens to cars with carburetors. It also sounds when I turn on the lights. This has been like this now for several hours today. Noticed today that after normal driving in normal conditions (14 degree outside) that some type of fan was still running after I switched the engine off. Here at Lancaster Brothers, our professional and experienced technicians are available to diagnose the problem quickly and fix it fast. When my air conditioning unit is off it makes a loud buzzing noise for a second or two (sometimes ending with a sound like the wall is vibrating) then doesn't happen again for 5-10 minutes. I've had my 2012 Golf TDI for about 2 weeks. it could be the wheel bearing making the buzzing sound. I have a 2 month old 18 Accord Hybrid EXL. I notice the humming when I have more than 2 people in the car, I notice the noise in all driving instances (i. Repair shop said it's an Actuator that's tied into the lend door that controls the air/heat. A hissing noise after turning the car off is actually caused by equalizing pressure, this is made by the Freon moving from the high-pressure side of the compressor down into the lower pressure side and is a completely normal occurrence and sound. So I have noticed on a few occasions, not all, after pulling into the garage and turning off the engine I hear a buzzing or humming coming from the engine. At first, I thought the noise was from the front as the acoustics in my garage fooled me. It is coming from a little gold box just to the right of the ECU! When I unplug a relay in the engine compartment labeled "ENGINE" the buzzing stops. when my car is off there is a electrical noise that sounds like a motor thats coming from below the engine by the radiator. The first sign is noises when you turn. When the home becomes exceptionally warm, the fan in the air conditioning unit turns on to remove some of the hot air from the space. Def sounds like a elec motor. It's hard to replicate for the dealer. Learn about this problem, why it occurs, and how to fix it. On 2 occasions when I went in my garage at home I heard the car humming from the center/rear (not under the hood). The noise is not constant but can be heard at almost any speed. The noise increases in pitch and volume as the car goes faster, and sounds rather like the propeller noise on a turboprop airplane. Finally broke down and took it to the dealership and. Gear changes are smoother, there's less body roll in the corners and you can judge the turning circle properly. Maybe once or twice in the morning. The whining noise mostly arises due to a loose power steering belt. Hi any ideas, I have had this 1999 discovery TD5 for a few years now and every time i switch it off there is a buzzing noise coming from front drivers side and it lasts about 15 to 20 seconds then goes off now Ive not really been to concerned about that as its been doing it for years. Kind of concerns me since Cooling fan noise after turning car off - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum. When I turn off the car, there is usually a slight buzzing noise still going on. The car drives fine aside from this. most car i had made that noise. After I turn off my car I hear a loud humming sound like a motor running from a part under the hood on the right side and a black tube that goes to it is vibrating. It is the same noise I hear when I open my car door, like the hybrid battery is warming up. I started and stopped the car and the sound stopped. Replacing your Microwave:. If the fan is on after key off then the engine was turned off during an active regen rather than passive. Facebook's idyllic open campus hides a 6,000-person security force, sometimes armed, dedicated to guarding the social-networking company's workers. After short while it stops, so since its always done it, and it does stop after maybe a minute, I assumed it was like the computer shutting down, or entertainment unit (it is Entune system with apps). When I turn the volume up, the bass sound seems acceptable to me, but the buzzing/humming was still there. There will be a series of whines, ticks etc, just "interesting" noises. If your furnace blower motor hums when it’s switched on but at the same time does not actually turn, the capacitor may be damaged. Bearings – Bearings are what help your car turn from side to side. You hear a whistling noise coming from under the hood: Check the hoses for vacuum leaks. Then, I'll know it's exactly the same as in my car. Shortly after the fan turns on, the air conditioner should turn on and begin cooling the air. My 2006 titan LE is making a humming noise while turning right only. This has only started to happen recently and i havn,t a clue what it could be ?? any ideas ??? thanks in advance. Humming A humming sound generally isn't serious, but it still signals that something inside your air conditioner is off. Upon leaving for work yesterday and a few moments after openning the door to get inside the car, a buzzing static noise started playing from all of the speakers. What I have noticed is there is a mechanical/motor noise from the passenger side rear wheel area after I shut the car off. Noise from under the vehicle NOTE: You may hear a noise from under the vehicle approximately 5 to 10 hours after the engine is turned off. That will be the in-tank pump. This was recorded after I shut the PC off. Does anybody else’s polo make a humming noise after turning the engine off, it can last up to 30 seconds. An aftermarket radio installed, but it has been in the car now for over 4 years without any issues. The car had been off for 5 hours but it almost sounded like the fuel pump had started running. My Nissan Murano 2009 makes a high pitch ringing constant (non stop) sound when it's turned off. It happens a few times and is very noticeable. you can probably hear it as being inside the hood. Anyone else have this noise?? *. There are two possible solutions: (1) Replace the actuator outright. I don't hear it as much at higher speed, but that could just be because there's more ambient noise. If your car makes noise when accelerating or turning, don't ignore it. Put the car in park and the noise stopped. It turned out to be the security system. The "hours after" throws me a bit, BUT the whine/cooling fan noise is probably the after engine shut down turbo cooling pump. Not sure I’ve heard it before. Sizzling, popping, or crackling sounds when a wall switch is turned on and off may well mean the switch is defective or worn out. Water pump replaced by honda. The exact same thing happened to me the day after I bought my '17 CRV - I went out into the garage to turn on the outside garage light, and my car was making a buzzing/vibrating noise. Problem: There is a 'buzzing' noise after the engine is switched off. I tried jumping it with my brother's truck, and it started, but after I took the cables off, i pushed on the brakes to turn the car off and it died again. At least once, I tapped the gas and the sound stopped and stayed gone for a few minutes, and then came back. What Causes The Annoying Circuit Breaker Buzzing Noise? One of the most commonly asked questions that certified electricians often receive has to do with that circuit breaker buzzing that often annoys home owners in Arizona. The exact same thing happened to me the day after I bought my '17 CRV - I went out into the garage to turn on the outside garage light, and my car was making a buzzing/vibrating noise. Maybe you just have a case of -I worked on my bike and now I'm nervous i did something wrong. Cars with fuel injection will have a whining or whirring noise from the fuel pump when the key is turned 'on'. Thanks for your fast reply yes I give the car a few seconds to a min when starting never Acc hard or fast till engine is warm when coming to turn off engine I give the car again a few seconds to then turn off. It makes noise when i accelerate, but even more noise when i take my foot off of the gas after the acceleration, but is usually quiet when the car is at a stop. Buzzing underneath while off? law of the land we got reports of these strange noises long after the car was shut down. it could be the wheel bearing making the buzzing sound. It stopped after a while, but would start up again if you changed A/C Air Conditioning settings. Unlike home audio systems, car audio systems have many sources of noise to deal with. Since it started making noise as soon as I selected recirculate, I was fairly certain the recirculate door motor was the source. for the humming noise could be the AC motor. However, this does not indicate a malfunction. Chevrolet Silverado 1500 Replace ABS Control Module to Prevent Pump From Running After Ignition is Turned Off - 87 reports. Search: Search. Kinda like a buzzzzz-zot kinda sound. Tire and let the store manager know that something was wrong with my car. put car on lift took off tire - checked everything out When I turn off my 2007 I hear a high pitched noise for a second up front. Facebook's idyllic open campus hides a 6,000-person security force, sometimes armed, dedicated to guarding the social-networking company's workers. When I turn off the car it makes a clicking noise. This is my problem. for the humming noise could be the AC motor. It happens a few times and is very noticeable. None whatsoever. When I turn my steering wheel, I hear a buzzing noise. Grinding noise when key turns in ignition Inspection Service When you turn the key in your car’s ignition, you expect the engine to crank. It seems to come from the back of the vehicle. Occasionally, after pulling my car into the garage and turn it off, I notice a high pitch ringing sound. It turned out to be the security system. A few times I have been able to get the sound to stop after clicking the overhead light on and off. If you hear this noise, turn off the unit immediately, and give us a call. Has anyone else experienced this?. Does anyone know what could be happening?. It sounds like the tones used to test hearing. I have a 2014 Titanium with just over 2,000 miles on it. There are various possible reasons why a car makes a humming or whirring noise as these sounds could be a sign of a bad bearing in the steering system, water pump or alternator. Top 10 Ways to Beat a Car Dealer. I stop trying to start it and a buzzing sound happens from the back. I have been very careful to be sure the radio, heater and lights are off to see if the sound stops. It has been doing this for a few months. same for my alarm clock, I hear its speakers start humming as soon as its cd player gets enabled or it scans for a radio channel. Last year at EICMA, Kymco pulled the cover off its fully electric. Ford fiesta zetec making a hoover sounding noise when I switch off the engine? Not sure what the problem is but when switching off my engine the car makes a hoover noise I mean the sound when you switch off your hoover, the car makes that noise this car is never ending problems its a zetec 52 reg and I've decided to change it next year but any. And she also added there are typically surging noises on and off during the buzzing, and typically a clicking sound before the buzzing stops. I have a 2007 Impala and after turning off a/c, knocking noise for about 30-45 seconds. It is coming from a little gold box just to the right of the ECU! When I unplug a relay in the engine compartment labeled "ENGINE" the buzzing stops. About 8 hours later, I went in the garage to get one of my tools and the lexus started making a wierd noise. I spend a lot of time driving at night to get home and when I pull into the garage it is very quiet. It's hard to replicate for the dealer. Is that a sound that you've never heard before?. A buzzing or low pitched humming sound can be the result of a bad bearing in the steering system, water pump, or alternator. All is well with the Flex now! Just letting all you Flex Owners with the 78MPH Noise that If you try hard enough with your Ford Dealer and the 800 Number too Ford and start a Case Number. Posted on Feb 16, 2009. So tonight I was in the garage and noticed a humming noise that seemed to be coming from my '12 WRX. When I turn off my dart lately there is a suddle humming noise that comes from under the hood. I was worried what this noise was. Stopped the car today and turned the engine off, then turned the ignition key 2 clicks clockwise so I could open a window, the yellow engine management light came on and when I pressed the brake pedal I could hear a buzzing noise coming from the passenger side footwell area, it did this noise everytime I pressed the brake (stationary), sounded sort of like an electric motor whirring. TROUBLESHOOTING: If you have an electrical component that is humming loudly it will need to be replaced. And then, something doesn't feel quite right. Repair shop said it's an Actuator that's tied into the lend door that controls the air/heat. Noise goes away after 1-2 min of driving. Hazard lights ok. Only when you run the engine, or when the engine is off also? With the engine running, does the static/buzzing increase in pitch? More often than not, there is a ground issue either at the amp or the head unit. First, there are no daytime running lights? My wife wants this. A few times I have been able to get the sound to stop after clicking the overhead light on and off. Hearing Good AC Noises Many times a friend or customer will ask me to come listen to a strange hissing sound coming from their vehicle when it is turned off after running the air conditioner. Yesterday i was spraying Meguiar's plastic/dash protectant on the steering wheel and all over the dash. Yesterday I started to get a buzzing sound but was still able to crank after turning the key few times. Do you experience a weird buzzing noise when the speakers are NOT turned on? Although it may sound odd, some people always have their radio on, so the buzzing noise may get mistaken for the actual speaker as opposed to the cover itself. A buzzing sound in a standard wall switch is one of several indicators that the switch may be going bad. I have a 07 Accord coupe with 35,000 miles - yes! still under warranty - I've experienced this issue 4 times where I turn the key in the ignition, get as far as "accessory" and then hear a buzzing sound coming directly from the ignition. This happens when the tension on it increases during a turn. It sounds similar to the sound if you drop a bolt in the engine bay or shaking a spray paint twice. When I removed the oil cap and/or dipstick-it continued to whistle. Strange noise coming from back of 2018 crosstrek, car is off. There is a humming noise coming from under the car like the fuel pump is running. How to Fix You Car’s Humming Noise. I have a 2011 GC Overland (V8 5,7L). After I turn off my car I hear a loud humming sound like a motor running from a part under the hood on the right side and a black tube that goes to it is vibrating. It's not running rough & it's not the AC cooling off. even though it is in a garage I hit the lock button and the sound went away. It seems to come from the back of the vehicle. Like I said, there is no unusual noises at the front. It kind of sounds like a phone ringing. Humming Noise When Going 60 - 70 mph. It makes noise when i accelerate, but even more noise when i take my foot off of the gas after the acceleration, but is usually quiet when the car is at a stop. I can't recall if I only hear it after the headlight were on. Drove it home from the dealer, parked it and started to walk inside when there was a buzzing noise, pretty loud. Headlight Noises. Thanks for your fast reply yes I give the car a few seconds to a min when starting never Acc hard or fast till engine is warm when coming to turn off engine I give the car again a few seconds to then turn off. I stop trying to start it and a buzzing sound happens from the back. I think it is some sort of timer and something to do with the electronics. The noise will stop after approximately 15 minutes. A humming, grinding or hissing car noise can end up costing you. It seems to be on the left side of the engine. therefore, went and got a new one but still the same old song. My A/C unit is making a humming noise when I turn it on--- the unit outside the of the house. It was 05/19/2007 when this transmission noise issue occurred. Buzzing from engine compartment after shutting off I've had my '03 XC70 since this past September and a new sound has popped up. Some of these are sources of noise that even the best, highest dollar receivers and the best antenna systems in the world cannot overcome and should be momentarily turned off while listening. This has been like this now for several hours today. I've had my 2012 Golf TDI for about 2 weeks. That can be removed and the car driven to see if the noise is from that source. I notice that every time i turn the car off after a short or long trip, i hear several noises coming from the engine compartment. It's not running rough & it's not the AC cooling off. I have a humming sound when I turn the key on my craftsman 273143 tractor could it be the starter or solenoid( the engine will not turn over) % off. When I turn off the car it makes a clicking noise. And then, something doesn't feel quite right. I have a 2014 Titanium with just over 2,000 miles on it. If you take the belt off and turn the alternator does it make any sound? Mine squeaks a little bit when you turn it by hand but when turning by engine speed it does not squeak at all. I have a 07 Accord coupe with 35,000 miles - yes! still under warranty - I've experienced this issue 4 times where I turn the key in the ignition, get as far as "accessory" and then hear a buzzing sound coming directly from the ignition. I've sat in my chargers after turning the engine off and they would make a noise like everything else shutting down. It is noticeable outside the car any could be normal. Re: Odd humming noise coming from engine. There are various possible reasons why a car makes a humming or whirring noise as these sounds could be a sign of a bad bearing in the steering system, water pump or alternator. Hi, I've a 1. isn't necessarily humming because of overuse. had to disconnect the battery cable to get it to stop making the humming sound. If you hear this noise, turn off the unit immediately, and give us a call. Tried Heavy Rain for a few days - that was quite good, but have settled on Brown Noise with the pitch set to the lowest setting. The car drives fine aside from this. Car starter motors use a small device called an overrunning clutch, or one-way clutch. Getting a high pitched ringing / buzzing noise after turning off the engine. I have an intermittent buzzing noise (starts off like a fly buzzing then gets louder like a beehive). Chevrolet Silverado 1500 Replace ABS Control Module to Prevent Pump From Running After Ignition is Turned Off - 87 reports. Another check would be to turn the engine off and leave the key ON so the HVAC works. The aspirator motor in the In-Car Sensor operates whenever the ignition switch is on (even when the ATC system off button is pushed). you'll also hear it if you turn on your accessories without turning the car fully on. I thought I was crazy because it stopped shortly thereafter and I've never heard it since. Humming Noise When Going 60 - 70 mph. when my car is off there is a electrical noise that sounds like a motor thats coming from below the engine by the radiator. The humming happens only when I'm. I conclude the sound was coming from the car and that turning the engine on must have turned the noise off. The sound stops as I discontinue full lock and return the wheel to its normal point (wheels straight). They are present whether i've had the AC on or off as well. Sorry for the slight static, my camera's not the best, but you can still hear the buzzing sound through it. The third time it happened, I had driven about 45 minutes, but only had the air on about 20 minutes into the trip and turned it off about 10 minutes before arriving. Not sure I’ve heard it before. I notice the humming when I have more than 2 people in the car, I notice the noise in all driving instances (i. I Just Hear A Whirring Sound. It sounds like something is running. There are various possible reasons why a car makes a humming or whirring noise as these sounds could be a sign of a bad bearing in the steering system, water pump or alternator. Since I can't afford a replacement pump, I've just been refilling the brake fluid as needed (maybe once a week). How to Fix You Car’s Humming Noise. Sounds like an electric motor. When it has gone loose, it does not follow its normal trajectory over the pulley but slips. The noise is not constant but can be heard at almost any speed. You may have to register before you can post: click the register link above to proceed. This is an early US model. Also noticed that the hood of the car is very hot. I have a 2006 Accord VP and when i turn the ignition switch forward to the point right before the car is going to turn on there is a soft buzzing noise coming from under the driver's side dash or somewhere in the steering column. First i heard a click noise turning left. So im back to square one trying to find the issue. This goes on for hours after it has been turned off. Yesterday I started to get a buzzing sound but was still able to crank after turning the key few times. It stopped after a while, but would start up again if you changed A/C Air Conditioning settings. I wonder if we have the same thing - fuel system evaporative leak test that's performed after the car is shut off. Naturally, this is after running the system for a while on a hot summer day. Obviously turbos run hot and the bearings in the units reside in a rather brutal environment and that becomes worse when the engine is turned off and bearings sit in oil that is cooking from the heat (term is called coking)…basically a turbo creates extremely high. Here are a few tips for how to diagnose a car sound while the vehicle is moving. Gear changes are smoother, there's less body roll in the corners and you can judge the turning circle properly. What kind of noise is it? It is a grinding noise (starter like) or a chirping noise (belt)? Possible that the belt is slipping on you on a cold start - they can make quite a bit of noise (chirping, squealing, humming, buzzing) until the engine warms up enough to drive the moisture off the belt. Warranty Coverage There may also be a no start condition or a OPERATION DESCRIPTION TIME discharged battery. I hear the fuel pump priming so I dont think its that. a noise coming from that part of truck. I've noticed it when the car was warm and cold. Everytime I turn the engine off (regardless of how long it has been running) there is noise that sounds like a rev up, I don't really know how else to describe it, kind of like pressure building, it lasts a couple of seconds and then stops. About 8 hours later, I went in the garage to get one of my tools and the lexus started making a wierd noise. That will be the in-tank pump. It seems as if the longer I've been driving, the louder the noise will start off once I turn off my car. It last for about 3 seconds then goes off for about 5 or 6 seconds then repeats itself over and over again. Louder near the trunk. This is an early US model. Maybe that's what it sounds like with the hood up standing by it. A grinding noise is most frequently associated with problems with brakes,. The sound will last for at least 10 seconds. Sounds like an electric motor. I have a humming sound when I turn the key on my craftsman 273143 tractor could it be the starter or solenoid( the engine will not turn over) % off. As I said, the noise usually stops on its own after a little while anyway, so I can eventually turn the brightness up as far as I need with nothing in addition to the regular sounds of my laptop. If the parts are not replaced, the car will also begin to bounce during turns. I was worried what this noise was. So I have noticed on a few occasions, not all, after pulling into the garage and turning off the engine I hear a buzzing or humming coming from the engine. It may look like the contactor in the picture or it may be similar, but have a metal bar across the top. I thought I was crazy because it stopped shortly thereafter and I've never heard it since. So im back to square one trying to find the issue. Top 10 Ways to Beat a Car Dealer. Honda CR-V Noises and Sounds. On Lawn Mowers. Unlike home audio systems, car audio systems have many sources of noise to deal with. Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. Stopped the car today and turned the engine off, then turned the ignition key 2 clicks clockwise so I could open a window, the yellow engine management light came on and when I pressed the brake pedal I could hear a buzzing noise coming from the passenger side footwell area, it did this noise everytime I pressed the brake (stationary), sounded sort of like an electric motor whirring. My A/C unit is making a humming noise when I turn it on--- the unit outside the of the house. That is the buzzing sound I hear. TROUBLESHOOTING: If you have an electrical component that is humming loudly it will need to be replaced. The whistling sound you are hearing could be air escaping through these holes. Last night my wife came home and told me that the car was making some whirring/whining sound with the engine turned off and no key in the ignition. The squealing happens a few feet before the truck comes to a stop and for a long time after I have released the brakes. First thought was bearings but they seems to all be ok. Replaced t/s switch, still does it. When I am waiting in my van for my kids activities to end I notice a whirling noise (electric motor running) with van turned off and key out of the ignition. If the In-Car Sensor is open or shorted on this system, the digital display will turn off. I also hear a high pitched noise coming from the car after the engine is turned off. There is a sound like running water which I hear at various intervals during the day, irrespective if water is being drawn off or not. 3 Ecoflex Meriva, 12 plate, and when I turn the ignition off there is what I can only describe as a humming noise for a minute or so afterwards. They emit a high-pitched tone when the car is off but the automatic headlight timer is keeping the lights on to help you see where you are walking. MY CAR WAS TURNED OFF. What I have noticed is there is a mechanical/motor noise from the passenger side rear wheel area after I shut the car off. To check the pumps individually, you can pull out the in-tank fuel pump fuse after you do the above test, and repeat the test. The car drives fine aside from this. What kind of noise is it? It is a grinding noise (starter like) or a chirping noise (belt)? Possible that the belt is slipping on you on a cold start - they can make quite a bit of noise (chirping, squealing, humming, buzzing) until the engine warms up enough to drive the moisture off the belt. These conditions are caused by901803A 1985-86 LTD/Marquis 0. The engine had been off for about 30-60 seconds. You hear a whistling noise coming from under the hood: Check the hoses for vacuum leaks. Hi, I have a Lexus RX 350 [2008]. If your air conditioner is making a buzzing noise that is loud enough to become a distraction in your home, chances are that something is wrong with your unit. The trim doesnt effect it unless i trim up enough to cause the car to start moving. After the radio was turned off, static noise was heard. when my car is off there is a electrical noise that sounds like a motor thats coming from below the engine by the radiator. I try to start the car and it spins. But they were scratching their heads on what that pop sound could be and why the SMG pump sound would stop at that point. And then, something doesn't feel quite right. Thanks for the reply - I appreciate the feedback. Intially I had the radio on and just caught it during a quiet spell and so I turned off the radio and air-con and there is a faint humming / whirring noise that gets higher or lower depending on the speed of the car. My Car Won’t Start. You will need to scroll down and search the link for the information you need to read or discuss. SUV Crossover Sedan Coupe Truck Sports Car Wagon Van Hatchback Convertible Small Car Luxury Electric Hybrid. Ever since I got it, many times (but not all) when I pull in garage turn off engine I hear sort of a humming noise, seems to be from dash. Ok so with all the snow we got this weekend, I have a hard time finding parking on the street. Why in the world is my N75 solenoid buzzing after I turn off my car? 2002 Golf TDI / ~190k miles I've been trying to troubleshoot random limp mode for a while now, and one of the things that I did to troubleshoot was replace my N75 solenoid with my unused (EGR Delete) N18 solenoid. It turned out to be the security system. Just a buzzing from the flasher when t/s are used in either direction. 8T and heard this humming noise after I turned off the car. More info on page 9 of the owners manual. Passive regen is a regen that happens without changing engine mode, it uses the heat produced from normal combustion rather than post injecting fuel etc. Thanks for the reply - I appreciate the feedback. Obviously turbos run hot and the bearings in the units reside in a rather brutal environment and that becomes worse when the engine is turned off and bearings sit in oil that is cooking from the heat (term is called coking)…basically a turbo creates extremely high. Similar to Alfie's answer above, Our 2016 Highlander was making a similar noise from under the rear passenger side and I found this on page 8 of the owner's manual: "Noise from under vehicle after turning off the engine" "Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. I also hear a high pitched noise coming from the car after the engine is turned off. most car i had made that noise. It depends on the headlight technology your car has. This is the sound of a fuel evaporation leakage check and it does not indicate a malfunction. After 3 hours of fussing over it I finally figured it out. As I said, the noise usually stops on its own after a little while anyway, so I can eventually turn the brightness up as far as I need with nothing in addition to the regular sounds of my laptop. It last for about 3 seconds then goes off for about 5 or 6 seconds then repeats itself over and over again. It kind of sounds like a phone ringing. If you know how to do electrical work you may be able to do this yourself (remember to always turn off the power before working on your heat pump’s electrical system). When you take a turn, the belt travels through the steering wheel pump's pulley. Brand: Humming noise on road: Is it the tires or the wheels? This summer I noticed the tires were making a "humming" noise in a kind of off-on-off-on manner.