P068A
ECM or PCM Power Relay De-Energized Performance Too Early
The main power relay drops out earlier than the calibrated post-run window allows. The ECU loses power before completing housekeeping (e.g. saving adaptions, parking the throttle), which causes adaptive learning to reset.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Common causes
Ordered by how often each turns out to be the cause.
- Relay coil weak - drops earlyCommon
Parts involved
- ECM Power Relay
P068A 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.