Skip the auto shop - Our mechanics make house calls

Q: Throttle body position sensor

asked by on

i have a 2007 chevy Tahoe that recently had a check engine code p0121 throttle body position sensor. The vehicle would rumble when deceleration or braking between 30 and 10 mph. I changed pedal position sensor and throttle body position sensor and still getting that rumble. It less frequent but it is still occurring. Your thoughts??

My car has 170000 miles.
My car has an automatic transmission.

A: The rumbling noise may be coming from the l...

The rumbling noise may be coming from the loose catalyst in the exhaust piping. It would need to be verified by a road test to listen to the noise. If the catalyst is breaking up in the exhaust then the catalyst would need to be replaced. Another possible cause is a vibration from the cooling fan.

If you can duplicate the noise by revving and letting off the gas then you may be able to isolate the noise and the failure. Either the fan clutch or the exhaust catalyst will be at fault.

If you need help with these checks, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the rumble firsthand for an accurate repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Repeated engine stalling, even when running and driving

An intermittent problem can be one the most difficult to correct, since the problem needs to be present to best diagnose it. But there are a few things that can lend to this problem. Some possibilities are the Mass Airflow...

Q: Engine turns off when driving, cannot restart

Hello. It sounds like you have a voltage problem. It may be a bad connection at the battery or at one of the ground connections. Both will commonly occur. Any loss of voltage will cause some serious module communication issues....

Q: P0420 code after idle relearn

Hello. P0420 is the code for catalyst efficiency below the correct threshold for bank 1. If you do not believe the catalytic converters are the issue, then the first thing I would do is check the bank 1 oxygen sensors....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.