If a vehicle has a P0968 DTC, it means that the computer has detected an open circuit (usually some sort of electrical problem), related to the pressure control solenoid C. If this is the case, the ECU will not be able to set the appropriate amount of hydraulic pressure for each shift.
How Serious is the Code?
Most of the time, the transmission problems associated with a P0968 diagnostic trouble code aren’t very severe at first. However, the symptoms of a bad pressure control solenoid circuit will eventually cause a number of serious drivability issues like slipping and engine stalling.
Symptoms of a P0968 include:
- Transmission slipping
- Transmission shifts harshly
- Transmission overheating
- Engine stalls unexpectedly
- Engine misfire-like symptoms
- Limp mode
- Dirty transmission fluid/filter
- Damaged wiring and/or connectors
- Faulty pressure control solenoid
- Faulty transmission pump
- Valve body failure
- TCM/ECU problems
How to Diagnose the Code?
The process of diagnosing a P0968 diagnostic trouble code should start with an examination of the transmission fluid. If it’s clean and bright, then the wiring and connectors along the transmission wiring harness will need to be checked for signs of damage and corrosion. Should no issues be found up to this point, then the pressure control solenoid(s), transmission pump, valve body and even the TCM and/or ECU will need to be considered.
What Repairs Will Fix P0968?
- Change the transmission fluid and filter
- Repair or replace damaged wiring and connectors
- Install new pressure control solenoid(s)
- Repair or replace transmission pump
- Repair or replace the valve body
- Reprogram or replace the ECU or TCM
- P0969 – Pressure Control Solenoid “C” Control Circuit Range/Performance
- P0970 – Pressure Control Solenoid “C” Control Circuit Low
- P0971 – Pressure Control Solenoid “C” Control Circuit High