Skip the auto shop - Our mechanics make house calls

Q: My car is jerking for an unknown reason

asked by on

My car jerks when i'm switching from park to drive and drive to reverse. It also jerks while i'm driving. I went to a Firestone and they fixed my mounts but it's still jerking. What could be the problem ?

My car has 107000 miles.
My car has an automatic transmission.

A: Hey there. This may be a sign of a failing ...

Hey there. This may be a sign of a failing transmission control module or low transmission fluid. The transmission control module (TCM) helps regulate fuel efficiency and power while storing information about the transmission system in its memory. A faulty transmission control module may cause the car not to increase its speed even when pressing the gas pedal and may respond poorly when you shift the gear into drive.

The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other components controlled by the the TCM include a kick down switch, traction control system, and cruise control module.

Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your car. When this is not working properly, you may notice harsh shifting or delays in shifting. If you would like to have this scoped out, a certified professional from YourMechanic can come to your car’s location to diagnose the jerking problem and follow through with repairs.

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How to get car running again

Hi. The battery will definitely be dead at this point so you can charge it or try jumpstarting the car, it may still run. If the battery isn't too old, it should be able to hold a charge and the...

Q: Car is not going into reverse.

Hi there. If your shifter will go into every gear except for reverse then you either have a bad synchronizer in the transmission or you have a shifter assembly failure. If the shifter will go into reverse with the engine...

Q: Hard to turn steering wheel when on park.

Hey there. There is a check valve in the power steering pump that quite often sticks after a rebuild. Since these are "restoration" components, they tend to sit on shelves longer than present-day parts. Tap lightly on the power steering...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...