Powertrain, generic · Hybrid propulsion

P0AEF Drive Motor Inverter Temperature Sensor A Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0AEF means the signal of inverter temperature sensor A is below its valid range. GM describes it as an NTC thermistor with a pull-up on the sensing board, so a low voltage reads as an impossibly hot inverter, usually a short to ground or an internal sensor fault. GM's thresholds: above 170 °C for 2.5 of 3.5 s, Type B, in the 2016 to 2019 hybrid tables; above 159 °C, Type A, one trip, in another 2019 table; above 150 °C on eAssist; above 130 °C, Type A, on the 2011 Volt; above 125 °C, Type B, on the 2011 and 2013 two-mode trucks. Stellantis lists P0AEF-11 for the 2026 Jeep Compass PHEV outside the US among codes behind an Electric Traction System Fault and a no-start, repaired by replacing the inverter.

Likely causes

Shorted sensor or circuit inside the power inverter module

Sensor signal shorted to ground in external wiring, where present

Moisture or coolant inside the inverter housing

Symptoms

Malfunction indicator lamp and hybrid warning
Electric drive power cut back strongly
Vehicle may not start (Jeep Compass PHEV)

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€300–5,000

Time1–6 h

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

Parts involved

drive motor inverter temp sensor ahybrid control modulewiring harness

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