P0946moderate severityPowertrain
Hydraulic Pump Relay Circuit Range/Performance
on 2002 Audi A6 3.0L V6 · AWD
What this code means
The hydraulic pump relay circuit is reading a value outside the expected range. The signal is present but not performing as the PCM expects.
Symptoms
- Erratic shifting
- Transmission warning light on
- Intermittent transmission problems
Common causes
- Failing hydraulic pump relay
- Poor electrical connection or corrosion
- Damaged relay circuit wiring
- Faulty PCM/TCM
Diagnostic steps
- Inspect relay and connector for corrosion
- Monitor relay circuit voltage with scan tool
- Test relay under load
- Check wiring for high resistance
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