P0A6CDrive Motor B Phase W Current
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A6C covers a general fault in the phase W current of drive motor B. No manufacturer documents P0A6C publicly. Where motor B sits on a separate axle, its three high-voltage phase leads are long and exposed, so cable and terminal faults are a realistic cause; for the motor A phase codes P0A5D, P0A60 and P0A63, Audi blames welding variances in the high-voltage wiring of the 2021-23 Q5 e quattro. On the sensing side, a Caterpillar patent recognises a dead phase sensor by its near-zero reading combined with a violated zero-sum of the three currents. CARB requires circuit and plausibility checks of drive components. P0A6D and P0A6E are the low and high cases, P0A66 and P0A69 phases U and V, P0A63 motor A. Motor B is switched off.
- What you may notice
- Hybrid warning lamp and MIL
- Loss of electric drive on the axle driven by motor B
- Likely causes
- LikelyPhase W high-voltage lead or terminal to motor B damaged or loose
- PossiblePhase W current sensor failed
- PossibleInternal fault of the motor B inverter
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.