P0A67Drive Motor B Phase U 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
- P0A67 reports that phase U of drive motor B carries too little current at the moment it should peak, which GM interprets as an open circuit in that phase. In the 2016 Chevrolet Volt tables for motor control processor B the test runs while the rotor is within 30 degrees of the U axis, the inverter is above 50 V in normal PWM and the squared current command exceeds 900 A²; a peak below 9 A for 0.4 s within a 0.6 s window sets a Type A fault with MIL on the first trip. GM's 2018 tables shared by the Volt and the CT6 plug-in keep the test but raise the command threshold to 4,900 A². P0A68 is the high side, P0A6A and P0A6D are phases V and W, P0A5E the motor A counterpart. Motor B is disabled.
- What you may notice
- MIL on the first trip and propulsion system warning
- Jerky or weak electric drive, reduced power
- Likely causes
- LikelyOpen circuit in the phase U cable, connector or terminal of motor B
- PossiblePhase U switch of the motor B inverter not conducting
- PossiblePhase U current sensor stuck at zero
- RareOpen winding of phase U in drive 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.