Powertrain, generic · Hybrid propulsion

P0A61 Drive Motor A Phase V Current Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A61 indicates that phase V of drive motor A carries, or reports, too little current when it should be near its peak, pointing to an open phase V circuit. GM uses the same peak-axis test as for phase U on the 2016 Chevrolet Volt motor control processor and in its 2018 hybrid tables, here with the rotor within 30 degrees of the V phase axis: inverter above 50 V in normal PWM, squared current command above 900 A2 in 2016 and 4,900 A2 from 2018, a peak phase current under 9 A for 0.4 s within 0.6 s, Type A with MIL on the first trip. On inverters that sense only two phases a dead V sensor also corrupts the calculated third phase. A Caterpillar patent detects such a sensor by a near-zero phase reading. P0A62 is the high side, P0A5E and P0A64 cover U and W.

Likely causes

Open circuit in the phase V cable, connector or terminal
Phase V current sensor reads zero
Phase V switch of the inverter not conducting
Open winding of phase V in drive motor A

Symptoms

  • MIL and propulsion system warning
  • Jerky or weak electric drive

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 a phase vinverter

Related codes

P0A60P0A62P0A5EP0A64P0A6A

References: gsi.ext.gm.com, gsi.ext.gm.com, patents.google.com.