Powertrain, generic · Hybrid propulsion

P0C04 Drive Motor B Current High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0C04 is the overcurrent check of drive motor B and protects the IGBTs of its inverter. GM flags it when the highest phase current exceeds 725 A on the 2011 Volt or 600 A on the 2012 two-mode trucks and in the 2016 to 2019 hybrid tables; the newer tables also fail a d-axis current below a stator-temperature curve of roughly -556 to -315 A. Fast and slow counters cover sudden and intermittent peaks, Type A, one trip. Stellantis names P0C04 with P0C01 on the 2026 Jeep Wagoneer S and Cherokee: cross-threaded or loose bolts on the three-phase cables between transmission and drive motor power inverter, checked by resistance against a 29 to 32 milliohm window. The car goes into limp mode with the MIL on.

Likely causes

Cross-threaded or loose three-phase cable bolts with metal debris (Stellantis S2608000006)

Shorted or damaged stator winding of motor B

Failing power switch or current measurement in the motor B inverter

Symptoms

Limp mode with red wrench or malfunction lamp
Sudden loss of electric drive power

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–6,000

Time1–10 h

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

Parts involved

drive motor bdrive motor b inverter

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