Q: My car is jerking from 2nd to 3rd gear and downshifts. Will jerk a little

asked by on

After a little driving my car will jerk from 2nd to 3rd gear and downshift. It will jerk a little too. Sometimes it will smooth out on the highway and sometimes it won't do it at all. They hooked it up to the computer and got a code for P0661 but I can't seem to understand why that would affect it. My transmission was rebuilt 45000 miles ago and it's been on and off like this for a year and a half and I already performed a fluid change and filter. Any help would be greatly appreciated.

My car has 230000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. Your car has what is called a secondary shifter valve or solenoid valve that is operated or directed by the PCM (Powertrain Control Module) which is what controls the drivetrain and transmission. Code P0661 is related to this and is what is causing the jerking between shifts. This can happen when the solenoid itself is bad or faulty or simply due to a poor connection or shorted harness. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make or suggest any repairs as needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My car is jerking from 2nd to 3rd gear and downshifts. Will jerk a little

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: Car overheating, but reservoir full

To start, a coolant pressure test should be done to check for any leaks in the cooling system. If there are leaks, the coolant level will be low and there will be air pockets in the system causing frequent overheating....

Q: Automatic position in dualogic doesn't work properly

Hello! I'll be happy to help. A common component on your particular vehicle that fails is the gearbox communication unit. When they fail it will cause the transmission to shift into neutral without command. Fiat is assessing this problem and...

Q: Possible issue with the shift solenoid or TCM?

It could be either one and it's impossible to say without inspecting the car. The difference between the O'Reilly diagnosis and the dealer's is probably one of equipment. O'Reilly uses a generic OBD-II scanner and the dealer should be using...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.