P0A6DDrive Motor B Phase W Current Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A6D completes GM's set of open-phase tests for drive motor B with phase W. Because each phase is only judged while the rotor sits within 30 degrees of its own axis, the code points to W alone rather than to the motor as a whole. GM's tables for the 2016 Volt require a running drive, more than 50 V on the inverter in normal PWM and a squared current command above 900 A²; the 2018 tables for Volt and CT6 use 4,900 A². If the W peak stays under 9 A for 0.4 s within 0.6 s, the Type A fault turns on the MIL after one trip. Typical findings are an interrupted W lead or terminal, a non-conducting switch or a sensor reading zero. P0A6E is the high side, P0A67 and P0A6A phases U and V, P0A64 the motor A test.
- What you may notice
- MIL on the first trip with propulsion warning
- Rough or reduced electric drive
- Likely causes
- LikelyPhase W lead or terminal of motor B interrupted
- PossiblePhase W switch of the inverter not conducting
- PossiblePhase W current sensor stuck at zero
- RareOpen phase W winding in motor B
- 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.