OBD-II code · Powertrain (generic)
P07D8 Unable To Engage Gear 8
The TCM commands a shift to 8th gear but the gear-ratio measurement does not confirm engagement — friction element does not lock up, slipping clutch, or shift solenoid does not respond. Falls back to the previously engaged gear.
Is it safe to drive with P07D8?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySolenoid stuck closed
- PossibleSlipping clutch in 8th gear element
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, Clutch Pack
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.