P0C04: Drive Motor B Current High

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.

Symptoms

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

Most 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

What to check, in order

Start with the simplest. You can tick off each step.

1. Read the codes with a hybrid-compatible scanner and write down the freeze frame data
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Make sure the battery cooling air intake is clean
4. Check the 12 V auxiliary battery, which can also trigger warnings
5. Leave any high-voltage measurements to a specialized repair shop

Good to know

• It can trigger limp mode.
• It affects emissions.

What each character of P0C04 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• C: Subsystem depends on the code range
• 04: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0C04?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0C04?

The most common causes are: 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.

Related codes

• P0C02Drive Motor B Current
• P0C03Drive Motor B Current Low
• P0C01Drive Motor A Current High
• P0C08Drive Motor B Phase U-V-W Circuit/Open
• P0BFEDrive Motor B Phase U-V-W Current Sensor Correlation
• P0BF1Drive Motor B Phase U Current Sensor Circuit
• P0BF5Drive Motor B Phase V Current Sensor Circuit
• P0BF9Drive Motor B Phase W Current Sensor Circuit

Sources

• gsi.ext.gm.com: 11OBDG01 HYBRID Diagnostics
• gsi.ext.gm.com: 12OBDG06 Hybrid Diagnostics
• gsi.ext.gm.com: 18OBDG02 Hybrid Diagnostics
• gsi.ext.gm.com: 19OBDG01 Hybrid Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.