Powertrain, generic · Hybrid propulsion

P0C11 Drive Motor A Inverter Phase U Over Temperature

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0C11 is a protective code: the temperature sensor at phase U of the motor A inverter reads a valid but excessive value. GM uses it across its hybrids. The 2011 Volt reads PIM sensor A against 98 °C, the 2012 two-mode trucks against 88 °C with a reset at 85 °C, both Type A; the 2016 Volt sets it above 126 °C for 1.2 s within 2 s, the 2019 table above 128 °C, Type A, one trip. On eAssist the single inverter code P0C11 sets above 118.2 °C as Type B, two trips. Sensor faults such as P0AEE block it. Phase V and W are P0C12 and P0C13. GM advises finding the cause of poor cooling. The inverter cuts power to protect itself.

Likely causes

Low coolant level or air in the power electronics cooling loop

Failed or weak electric coolant pump of the inverter loop

Clogged power electronics radiator or inoperative cooling fan

Sustained heavy load such as towing uphill in high ambient heat

Symptoms

Malfunction indicator lamp, often with a hybrid system overheat message
Reduced propulsion power until the inverter cools down
Electric drive unavailable, engine runs continuously

Repair estimate

DifficultyHardWorkshop job

Parts and labour€50–3,500

Time0.5–5 h

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

Parts involved

drive motor a inverter phase u

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