P0A68Drive Motor B Phase U Current High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0A68 means the current measured in phase U of drive motor B rises above its plausible maximum, either because a real overcurrent flows, for example through damaged insulation, a winding short or a shorted power switch, or because the phase sensor reads too high. No manufacturer documents P0A68 publicly. For the motor A counterpart P0A5F, Hyundai links phase-high codes on the 2017 Ioniq Hybrid to coolant leaking inside the traction motor, together with an insulation fault. A Toyota patent explains why the inverter must react quickly: overcurrent loads the power switches and can destroy them, so the drive is cut. CARB requires monitoring of electric drive components. P0A67 is the low side, P0A6B and P0A6E cover V and W. Motor B is shut down.
- What you may notice
- Hybrid warning and MIL, often with an insulation fault code
- Sudden loss of drive from motor B
- Likely causes
- LikelyWinding short or insulation breakdown in phase U of motor B (e.g. coolant ingress)
- PossibleShorted power switch in the phase U leg of the inverter
- PossiblePhase U current sensor reading too high (gain or offset fault)
- 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: €400 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.