VW/AUDI · DTC LOOKUP
P0688 — ECM power relay sense circuit fault
VW/Audi diagnostic code. Below: what it means, common causes, symptoms, and the exact bench-programming fix path.
Common causes
- •ECU power relay fault
- •ECU EEPROM corruption
- •Wiring fault to ECM relay
Symptoms you'll see
- •Crank-no-start
- •P0688 active
- •Other ECM-power codes co-present
The fix path
If wiring + relay check OK, ECU internal data may need restoration via IMMO Delete process.
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