Q: My car is jerking for an unknown reason

asked by on November 01, 2016

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.

Transmission Fluid Service $125.08 - $440.73 Get a Quote
Speed Sensor Replacement $92.92 - $1189.26 Get a Quote
Wheel Speed Sensor Replacement $103.84 - $582.33 Get a Quote
Throttle Position Sensor Replacement $129.21 - $646.10 Get a Quote
Car is hesitating and bucking Inspection $79.99 - $89.99 Get a Quote

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.

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

What others are asking

Can't turn off immobilizer on 2002 Jetta 2.0l.

The Immobilizer System Control has failed and is stuck in lock mode. I recommend either flashing the Immobilizer System Control or replacing it. If you need further assistance with your engine not starting, then seek out a professional, such as...

Unable to shift into gear

Hello. If the shifter will not move than that is typically a failure in the shift interlock which keeps the shifter locked in park until the brakes are applied. See if the brake lights are working. If they are not...

Rotor specifications?

Front rotors are BMW part number 34116864047. You will need 2 of course. Rear rotors are BMW part number 34216864052. You will need 2. If you input these part numbers on-line, you will find the rotors easily. Shipped they are...

My car died and won't start what could the problem be?

Hello. A no start condition can be caused by many things. If you believe that the engine may not be getting fuel then I would start with examining the vehicle's fuel system. It may be possible that one of the...

My car cranks but won't start.

Hello, thanks for writing in about your 2002 Pontiac Grand AM. There are several possible causes for a vehicle to not start. There could be a fuel supply problem, an ignition problem, or even a failed sensor. For an issue...

Has reverse, but no drive after sitting for months and was working before being parked.

A cause of this can be a stuck manual valve in the valve body. You can check to see if the shift linkage actually moves to the drive position when commanded. If it does, there is a hydraulic fault in...

Clunking noise when i turn and stays but stops when i pressed the brakes, and come back on. Noise starts after i make a turn.

The tires that you bought are wider (by 0.79 inches) than the ones you had originally installed. However, if the larger tire size is listed in the tire catalog as a direct interchange for the original size, on your year,...

Transmission only is in 1st and reverse.

Hi there. Today's modern automatic transmissions are much more complex than in years past. Because of this, your shifting issue may be caused by several individual internal components such as the ring gear, central gear, or even the torque converter....

Car cranks but won't start. Security system was supposedly removed by previous owner.

This vehicle does have a built in factory alarm system and if the system is altered to try to remove it then you would need to either find out what was altered or have a mechanic like one from YourMechanic...

Related articles

2007 Nissan Versa vs. 2007 Saturn Ion: Which One Should I Buy?
Compact cars as a class are generally meant to be commuter vehicles: with excellent gas mileage, an entry-level price point, and decent safety ratings for those who are on the road the majority of their time. These cars also make...
How to Drive a Toyota Prius
For For someone who has never driven a Prius, it may feel a bit like stepping into the cockpit of an alien spaceship when sliding into the driver’s seat. That’s because the Toyota Prius is a hybrid electric car and...
Saturn Certified Pre-Owned (CPO) Car Program
Drivers Drivers who are shopping around for a used Saturn vehicle may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on to...