Fault code P0768 – a step-by-step guide to diagnosing and fixing it

Error code P0768 is displayed and the check engine light is on - what does this mean?

The OBD system has detected an error in the shift solenoid valve D of the automatic transmission. This DTC P0768 indicates a problem with the electrical circuit of the shift solenoid valve D, which is responsible for proper gear shifting. The exact designation may vary for different manufacturers, but the basic function remains the same.

What can cause this error code?

• Defective shift solenoid valve D
• Damaged wiring to the shift solenoid valve
• Corroded or loose plug connections
• Defective transmission control unit (TCM)
• Low transmission oil level
• Contaminated or old transmission oil
• Internal transmission damage
• Defective fuse for the shift solenoid valve

What symptoms occur in parallel with fault code P0768?

• Shifting problems: The transmission shifts hard or jerkily
• Gear change problems: Certain gears cannot be engaged
• Emergency running program: The transmission gets stuck in a gear
• Increased fuel consumption: Due to inefficient gear changes
• Vibrations: Noticeable unsteadiness while driving
• Delayed shifting: The transmission reacts sluggishly to gear changes

How can the problem of error code P0768 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Check the transmission oil level and top up if necessary, using the correct ATF oil
• Remove the shift solenoid valve D, clean it or replace it completely if it is defective
• Check the wiring and plug connections to the shift solenoid valve for damage and repair them
• Test transmission control unit (TCM) with diagnostic device and replace if defective
• Carry out a complete transmission oil change with filter change if the oil is contaminated
• Check transmission system fuses and replace defective fuses
• In the event of internal transmission damage, have the transmission repaired or replaced professionally