OBD-II code · Powertrain (generic)
P0786 Shift Timing Solenoid A Range/Performance
Shift timing solenoid A is electrically intact, but the actual shift time does not match the model — shifts too fast (harsh) or too slow (slipping under load). Often aged solenoid with weakened force or contaminated ATF restricting the regulating port.
Is it safe to drive with P0786?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyAged solenoid with weakened magnetic force
- PossibleOld, contaminated transmission fluid
- Less likelySensor element aged beyond calibration window
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
- 2–8 h
- Emissions test
- Usually unaffected
- Parts involved
- Shift Timing Solenoid A, Transmission Fluid
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.