Prius (2004-09) :: Humming Sound When Car Is Coasting With Gas Engine Off
Aug 25, 2012
My 2008 Prius had a front quarter panel replaced after my wife back in to a fire hydrant.The body work looks fine , no issue there, but now when the car is coasting with the gas engine off you can hear a humming sound that was not there before the repair.Also it does,nt seem to be recharging the hybrid battery at the same rate.My thought is maybe the body shop caused some damage to MG1 by spinning the front tires on a emision testing machine or rollers.Does special precautions would have to be used when testing wheel clearances after a quarter panel replacement on a hybrid? Would a body shop need to do this ?
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My wife's 2006 Prius is having some problems. The car has 187,000 miles on it. When the engine starts it makes a continuous whirling or humming sound. WHen I try to drive it has minimal power and can not be driven above 15-20 mph on my street. I bought an inexpensive Actron code reader and got the following codes. P0A92 P0300 P0303 P0304 P3191. Does it sound like a definite transmission problem and those other codes are caused by the transmission problem.
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I had whining from the engine compartment when I am coasting and accelerating, much noiser than in the past. I had been getting a C1310 code along with C1253 , C1241 and C1300, but I changed out the Anti Skid ECU and these went away. However I still get the red triangle of death VSC and ABS lights on after driving on the highway for about 10 minutes at speeds over 65. So I then got P0A2B 250 codes, Drive motor A temperature sensor. After it rested a while and I restarted the car, all but the red triangle would go out. After two more starts the Red triangle went away too. This happened for a few weeks, until one day after a trip, the car just stopped. Would not start at all, no ready light went on. Testing gave me a P0AA6 526 code, Hybrid Battery Voltage System Isolation Fault. Now I know the 526 could be multiple faults but with the whining and the P0A2B, I am thinking the transaxle is the smoking gun.
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When my AC turns on or changes speed - a humming sound occurs. It only lasts for about 1 - 2 seconds.
Is this normal
It sounds similar (higher pitched, but not as loud) to the humming you hear when you turn the vehicle off.
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2007 GX470 - Just noticed a distinct whining/humming sound similar to tire hum you would have with aggressive off-road tread tires. Seems to come alive around 20mph (or at least that's when I can hear it) and gets louder with the increase in speed. As I slow the sound goes away. Only does it while moving and not in neutral with engine rev.
We bought the car at 59k and it just hit 70k . Only oil changes, tire rotation have been done since we bought it. The tires were new when purchased so they have about 10k on them. No noise when we first got the car so I tend to think it's not related to the tread.
I was planning to do the front/read diff and transfer case drain/fill. Wondering if that may be the cause.
Something else - at low speed in tight turn (i.e. backing out of garage, pulling into parking spots) I do feel some roughness - almost like the differential is locked. Not sure if that is an indication. Was thinking it may be a wheel bearing but there is no clunking when turning.
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Yesterday when driving at high elevation and extremely cold temperature I heard and felt a pulsing from rear of my car when coasting or idling.
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Noticed the barely audible (with good ears) high-pitched sound that emanates from the car when you let off the throttle enough to prevent any charge or discharge bar from showing? It goes away if you completely release the throttle or if you press the throttle a tad bit more.
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2004 Sienna LE with 193,500 miles. While driving home tonight I started hearing a grinding noise from the passenger front wheel. The noise goes away on acceleration and braking. Whenever I take my foot off the gas it starts to make the noise again. It sounds almost like a brake noise but I just replaced the caliper bracket this past weekend and the brakes look great (less than 20,000 miles on caliper, rotor and pads). I suspect a bearing may be going bad and want to know if these symptoms match a bad bearing. The wheel bearings are all original.
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My 2004 Santa Fe 2.4L manual transmission with 200,000km on it has this hard to explain noise when in gear and coasting. This is when my foot it off the gas and say I'm going down a slight incline. There is a pulsating humming noise, worse in the lower gears that coincides with the engine holding the car back. This only seems to happen during coasting and not when down gearing to slow down. And even when coasting if I press even ever so slightly on the gas so the engine is not holding the vehicle back, it goes away.
The clutch has never been replaced and I'm somewhat assuming it may be the clutch becoming worn.
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2004 Sienna LE with 193,500 miles. While driving home tonight I started hearing a grinding noise from the passenger front wheel. The noise goes away on acceleration and braking. Whenever I take my foot off the gas it starts to make the noise again. It sounds almost like a brake noise but I just replaced the caliper bracket this past weekend and the brakes look great (less than 20,000 miles on caliper, rotor and pads). I suspect a bearing may be going bad and want to know if these symptoms match a bad bearing. The wheel bearings are all original.
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Last week as I was returning home I had a strange event in my Prius. I was coasting at about 30 mph when I heard a very faint pop sound a bit like a balloon breaking. It sounded like it came from the right rear area of the car. Afterwards I thought I detected a very faint chemical smell. Could this have been something involving the HV battery?
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I hear this humming sound when hit 70mph and I am on the gas. However it lasts till 73mph or so and go away!. Below is the pattern I observed;
1. On gas (accelerating), when hit 70mph (not even 69 mph) I start hearing humming sound. It will last till 73mph and goes away. Not able to pin point the source. I feel it is originating somewhere closer to transmission shift.
2. Decelerate from above 73mph and no gas given, when hit 70 I don't hear the sound. Press the gas pedal, I hear.
3. Set the cruise at 70, I hear.
4. The hmmmm sound appears only between 70-73 mph speed and while on gas.
What is this sound?. What is the source?
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I have a 2004 Santa Fe (4 cyl 2.7 L FWD) with only 42,000 miles on it. Coming home from work I was stopped at a stop sign and after stepping on the gas (halfway thru the intersection) my engine stalled - coasting to a stop (while crossing a very busy intersection I might add). After putting it in park I try to restart it - the engine cranks over as usual and starts but roughly 4 to 7 seconds afterwards it stalls again. I did this 4 or 5 times again with the same results. I'm almost positive the check engine light is on. The next day I popped the hood to see if the belt broke but its fine so I tried to start it again (same results engine starts but after 4 to 7 sec. stalls again). Before this engine trouble I haven't had one ounce of trouble from my Santa Fe. Not to be funny but yes there is a half a tank of gas in it... with plenty of fluids in it. After some research I kind of think its the Crank-shaft sensor (seems to be a problem with them in the Santa Fe's).
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Finally got the Tech to acknowledge the Humming/Groaning from the Engine as I sat behind the wheel at my 5000 mile service visit. His response was that the sound we were hearing ( at start-up) was "NORMAL"
The RX drives and sounds fine after that mileage, but many times my destination is less, and I feel like I am driving a reject.This has persisted since new, @ frigid and high temps; as we approach 7500 miles.
Engine sound varies in pitch when acceleration increases the RPM's ?
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Symptom: A vibration that feels somewhat like a bouncing tire
Cause: Coasting in Drive (Applying the gas at all stops the vibration, putting the car in Neutral also stops the vibration)
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It's starting to get a little chilly, and I'm hearing a strange noise. When the car is cold and the heater fan is on 3 or 4 "marks", I can hear a hum coming from behind the dash on the drivers side. The hum will have a haearbeat type sound to it every second or so. It's definitely some type of motor sound. It seems to go away (or maybe I can't hear it) when the car heats up.
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In my 2007 Sonata, I hit a poorly placed high manhole cover in a dip in the road, in the dark, going 30MPH, whacked it good before I could adjust...
I then pulled the car over, it seemed to go dead, then the car did crank back up, the engine sounded much louder, like a loud rev/hum, not quiet like usual.
I next drove a mile to a c-store, transmission seemed OK, no leaks, did see a check engine light briefly, but it disappeared. Car cranked OK, headed home, same sound right at cranking and at moderate speed.
Finally, I jacked the car up on the front left, from research appears that the plastic engine shields got smacked good along the front and near the right tire and bent back quite a bit on the left side. There seems to be no other structural damage that my untrained eye could see, just one indention you'll see in a couple of the photos that I think is part of the car design at that spot.
Again, no leaks, no smoke, no caution lights of any kind now.
Photos are attached...
My Hyundai's engine now sounds like a Mustang! Hoping it's just the engine noise from these plastic covers now being bent/destroyed in some spots, exposing the engine and the typical noise you'd hear without them...
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I hear a weird humming sound when I press the gas pedal.it goes away when I press hard. Also it sounds while shifting gears...
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After I took my Ford Focus 2011 to the dealership for a free oil change I noticed a subtle, low hum coming from the car when I hit speeds past 40mph. At first it sounded like the engine of a louder car driving near me so it took me a couple days to realize that it was actually my car making the noise. I intended to bring the car right back to the dealership to complain about this but I kept getting preoccupied with my studies for my summer courses. It's been roughly 3 weeks now and the low hum has gotten a lot louder now and can be heard over music.
The noise begins when I approach 40mph. The noise is probably at its loudest at speeds of 40mph-70mph. The noise is made even when I am not stepping on the accelerator or using the breaks. I haven't tried putting the car in neutral at those speeds. What might be causing that noise? Although I don't really trust the dealership since my car seems to manifest a new problem after each visit.
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I just got my Prius in August. The car makes a humming sound when I accelerate and brake. Is this normal?
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My 2010 is humming like bad.....I think it's the rear. the faster you go, the louder it is. Put new tires on - same noise.
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