P0A68 code meaning
Drive Motor B Phase U Current High
Powertrain system Generic code P0Axx codes Check engine light
What P0A68 means
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.
P0A68 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1.5 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A68
- Hybrid warning and MIL, often with an insulation fault code
- Sudden loss of drive from motor B
Common causes of P0A68
- Most 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)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b phase uInverter
What each part of P0A68 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 68 | The exact fault in that area. |
What to do next
- Note P0A68 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A68
What does P0A68 mean?
P0A68 means "Drive Motor B Phase U Current High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A68?
Drive gently and only to a workshop. With P0A68 the car can go into limp mode (reduced power) to protect itself.
Will P0A68 fail an emissions test?
Yes, it can. P0A68 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A68 to fix?
Difficulty: workshop only. A typical repair takes 1.5 to 10 hours of work. This is a job for a workshop.
Will P0A68 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.