P2788
Auto Shift Manual Adaptive Learning at Limit
The adaptive learning that compensates for clutch wear or hydraulic drift in an automated manual transmission has reached its limit. No more compensation is available.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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
Common causes
Ordered by how often each turns out to be the cause.
- Clutch worn beyond compensation rangeCommon
- Hydraulic pressure regulation has driftedPossible
Parts involved
- TCM
- Clutch
P2788 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.