Powertrain, generic · Hybrid propulsion

P0C13 Drive Motor A Inverter Phase W Over Temperature

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0C13 covers phase W of the motor A inverter: the controller sees a credible sensor reading that exceeds the overtemperature limit. GM's 2011 Volt uses PIM sensor E with 98 °C, the 2012 two-mode trucks 88 °C, the 2016 and 2018 tables 126 °C for 1.2 s within a 2 s window and the 2019 table 128 °C for 1.5 s, always Type A, one trip, so the MIL comes on at once. The check is blocked while circuit or performance faults of the thermistor are active. Siblings are P0C11 for phase U and P0C12 for phase V; P0C16 is phase W on motor B. Because the code reports a real heat condition, the cooling system of the power electronics is the first place to look; output stays limited.

Likely causes

Coolant loss or air pocket in the power electronics loop

Electric coolant pump for the inverter stopped or running slow

Debris on the low-temperature radiator or cooling fan not running

Symptoms

Malfunction indicator lamp immediately after the fault
Reduced propulsion until temperatures drop
Engine runs more often, little or no electric driving

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 w

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.