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.

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

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・Fair and transparent pricing

Get a quote

What others are asking

Q: How much do mechanics charge to fix a blown head gasket on a 1996 BMW

Hey there. You are looking at a minimal charge just to remove the head and install the head with a new gasket to be 9.0 hours. There is always additional charges like disassembly of cylinder head to prepare to go...

Q: I have a 99 Yukon when I put it in reverse it goes forward. It has only done it twice

Hello and thank you for contacting YourMechanic. Make sure the linkage on the side of trans moves along with the shifter cable as the cable moves. If that's okay, then drop pan and check the linkage to manual valve...

Q: Grinding noise when I shift into gear, when in "park", car rolls down driveway.

Hi there. The issue with your transmission seems to have a few problems. First there is a park arm that locks your transmission in park. If the park arm is working, the transmission will not move the car. First check...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.