Engine and gearbox (P)
P0780: Transmission shift malfunction
The transmission has detected an incorrect or failed shift, which can affect vehicle performance.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Harsh or delayed shifting
- Transmission slipping
- Check engine light on
Common causes
- Fluid issue
- Solenoid fault
- Valve body wear
- Wiring problem
- Transmission control module fault
How to check it yourself
- Read transmission module data
- Check fluid level and condition
- Inspect wiring and connectors
- Test solenoids
- Examine valve body
Can I keep driving?
Avoid driving if the transmission is slipping or shifting harshly, as it may cause further damage.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer