P0966high severityPowertrain
Pressure Control Solenoid "B" Control Circuit Low
on 2003 Audi A6 3.0L V6 · AWD
What this code means
The control circuit for pressure control solenoid B reads lower voltage than expected. This typically indicates a short to ground or internal solenoid failure.
Symptoms
- Harsh shifting
- Transmission slipping
- Check engine light on
Common causes
- Short to ground in wiring
- Faulty pressure control solenoid B
- Damaged connector
- Faulty TCM/PCM
Diagnostic steps
- Scan and record freeze frame data
- Inspect wiring for shorts to ground
- Measure solenoid resistance
- Repair wiring or replace solenoid
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