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DTC codes / P0Axx · Hybrid propulsion / P0A67

P0A67Drive Motor B Phase U Current Low

P0A67 indicates that the inverter controller has detected an abnormally low current in phase U of drive motor B during operation. The computer compares commanded current with actual current feedback and flags this code when the measured phase U current falls below the expected threshold, which can be caused by a faulty current sensor, damaged wiring, or an internal motor or inverter fault.

SystemPowertrain
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • Illumination of the hybrid system warning light or service vehicle soon message
  • Reduced power or limp-home mode with limited acceleration
  • The vehicle may refuse to start or shift into gear
  • Intermittent stalling or sudden loss of motive power while driving
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty current sensor inside the inverter or motor controller
  2. Damaged or corroded wiring in the phase U circuit between inverter and motor
  3. Loose or degraded electrical connector at the motor or inverter
  4. Internal short or open in the motor phase U winding
  5. Failed inverter power module or gate driver affecting phase U
  6. Software glitch or outdated calibration in the hybrid control module

How to diagnose and fix it

  1. Connect a scan tool and record all hybrid system freeze-frame data and related codes
  2. Inspect the phase U wiring and connectors for chafing, corrosion, or loose pins
  3. Perform a resistance and insulation test on the phase U motor winding and compare with phases V and W
  4. Check the current sensor signal with an oscilloscope or manufacturer-specific live data
  5. Verify the inverter power module and gate driver operation according to service information
  6. Reprogram or update the hybrid control module if a software bulletin applies
  7. Replace the faulty current sensor, inverter assembly, or motor as diagnosed

What the phase U current code hides

  • A low current reading often results from a poor connection or high-resistance joint rather than a failed motor, so always perform a voltage drop test under load.
  • The current sensor itself can drift and report low current even when the motor is functioning correctly, leading to unnecessary motor replacement.
  • Intermittent faults may only appear under specific load or temperature conditions, so road-testing with live data is essential.
  • This code can be set by a weak 12-volt auxiliary battery causing unstable logic power to the inverter controller, so check battery health first.
  • Related codes in the P0A6x range often accompany this one, but P0A67 specifically points to phase U, so do not assume a general motor fault.

Can I keep driving with P0A67?

Do not continue driving with this code active, as it can cause sudden loss of power and increase the risk of a crash. Have the vehicle towed to a qualified hybrid service facility for diagnosis.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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