OBD-II code · Powertrain (generic)
P0781 1-2 Shift Malfunction
The TCM detects a fault during the 1-to-2 upshift. The actual gear ratio after the shift command does not match the expected ratio for second gear.
Is it safe to drive with P0781?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyShift solenoid A faulty
- Possible1-2 clutch slipping
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Solenoid A, Transmission Clutch Pack, Valve Body
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.