Powertrain, generic · Hybrid propulsion

P0AF0 Drive Motor Inverter Temperature Sensor A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0AF0 reports a signal from inverter temperature sensor A above its valid range, which for an NTC sensor reads as an extremely cold inverter: open wire, lost ground or a broken sensor. GM's 2016 to 2019 hybrid tables set it below -50 °C for 2.6 of 3.65 s, but only after at least 90 s of inverter warm-up at 20 Nm or more, so a really cold car does not trigger it; Type B, two trips. The 2011 Volt uses below -58 °C (Type A), eAssist below -70 °C and the two-mode trucks below -40 °C (Type B). Kia's 2025 Sorento Hybrid bulletin lists P0AF0 with P0A3C and P1B77 after intermittent motor operation during engine clutch learning and fixes it with a motor control unit update.

Likely causes

Open sensor or circuit inside the power inverter module
Motor control unit software (Kia Sorento Hybrid 2025)
Loose or corroded connector at the inverter

Symptoms

  • Malfunction indicator lamp and hybrid warning
  • Reduced electric drive power
  • Traction motor noise or inoperative A/C (Kia)

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–5,000
Time0.5–6 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

Related codes

P0AEFP0AEDP0AEEP0AF1P0A3CP0AF5

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