Powertrain, generic · Hybrid propulsion

P0A69 Drive Motor B Phase V Current

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A69 flags a general fault in the current of phase V of drive motor B. No manufacturer documents P0A69 publicly. Phase V matters doubly on many inverters: a Hyundai patent describes designs that measure only two of the three phase currents and calculate the remaining one, so a faulty V reading also distorts the computed phase. A Caterpillar patent detects a failed sensor through the zero-sum rule of the three phase currents and can then estimate the missing value. CARB requires monitoring of electric drive components for circuit faults and plausibility. P0A6A and P0A6B are the low and high variants, P0A66 and P0A6C phases U and W, P0A60 the motor A equivalent. The driver sees a hybrid warning and motor B is taken out of service.

Likely causes

Phase V current sensor of motor B failed
Fault on the motor B inverter board or power stage
Phase V high-voltage cable or terminal loose or damaged

Symptoms

  • Hybrid system warning and MIL
  • Reduced power, motor B no longer contributes

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–6,000
Time1.5–8 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor b phase vinverter

Related codes

P0A6AP0A6BP0A66P0A6CP0A60P0A55

References: patents.google.com, patents.google.com, law.cornell.edu.