P0A67

What it means

P0A67 means the hybrid or electric vehicle control unit has detected a low current in phase U of drive motor B. The inverter or motor control unit compares the measured phase current with what it commanded and with the expected range, and it set the code when the current was too low or missing. The exact trigger thresholds and the position of motor B vary by model, so check the manufacturer data for the vehicle.

Symptoms

• Hybrid or EV system warning light on the dashboard
• Reduced power or limp-home mode
• Vehicle will not enter Ready mode or will not move
• Shuddering, hesitation or rough drive when pulling away
• Engine running more than normal on a hybrid, or the electric motor assist missing
• Other drive motor or inverter fault codes stored alongside

Possible causes

• Fault in the phase U current sensor or its signal circuit inside the inverter or motor assemblylikely
• Open circuit, damaged or loose high-voltage phase cable or connector between the inverter and drive motor Blikely
• Inverter power stage fault affecting phase U outputpossible
• Drive motor B stator winding open circuit or insulation fault on phase Upossible
• Low-voltage supply, ground or communication problem to the inverter or motor control unitpossible
• Faulty motor control unit or outdated software where the manufacturer lists it as a known causerare

How to diagnose

1. Read and record all stored and pending codes with freeze frame data, noting vehicle speed, motor torque request and high-voltage battery state at the time
2. Check for related inverter, motor, resolver or high-voltage isolation codes, and look up any technical service information for the model
3. Check the 12-volt battery condition and the low-voltage supplies and grounds to the inverter, as low voltage can cause false current faults
4. Only if qualified in high-voltage work, shut down and isolate the high-voltage system following the manufacturer procedure and prove it dead before touching any orange cables or connectors
5. Visually inspect the phase cables and connectors between the inverter and motor B for damage, corrosion, heat marks, coolant ingress or loose terminals
6. Measure the phase U continuity and the motor winding resistance and insulation against the manufacturer specification
7. Use live data to compare the three phase current readings while the system is operating and see whether phase U is out of line
8. Check the inverter cooling system condition, as overheating can damage power components

How to fix

• Repair or replace damaged phase cables, connectors or terminals, and secure them to the correct torque
• Replace the current sensor or the inverter assembly if the phase U sensor or power stage is confirmed faulty, as the manufacturer specifies
• Repair or replace drive motor B if the winding is open or faulty
• Correct low-voltage supply, ground or wiring faults, and replace a weak 12-volt battery
• Update the motor control software only if the manufacturer identifies an outdated calibration as the cause
• Clear the code after repair and road test to confirm it does not return

Can I keep driving?

Nearby codes

• P0A66GenericDrive Motor B Phase U Current
• P0A68GenericDrive Motor B Phase U Current High