Powertrain, generic · Hybrid propulsion

P0A2C Drive Motor A Temperature Sensor A Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The motor A sensor is an NTC thermistor, so its signal voltage falls as the winding heats; Hyundai's Sonata Hybrid bulletin gives about 11 to 13 kOhm at 20 °C for 2014-15 units. P0A2C means the voltage is too low, which the module reads as an impossibly hot motor: GM sets it on 2013 two-mode trucks above 230 °C (near 0 V), Type B, two trips; the 2011 table uses 184 °C, the 2013 MGU mild hybrid 236 °C. The usual cause is a signal wire shorted to ground or a shorted sensor. P0A2D is the opposite fault, P0A2F a real over-temperature that only counts while the sensor is in range. Hyundai reports a stuck 417 °F reading as a circuit fault. The driver sees a warning and derated electric drive.

Likely causes

Sensor signal wire shorted to ground
Thermistor internally shorted (often only with transaxle or motor)
Chafed extension harness between drive unit and inverter
Faulty sensor input in the inverter/motor control module

Symptoms

  • Hybrid system warning or check engine light
  • Motor temperature shows a very high fixed value in live data
  • Electric drive power reduced or disabled

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–4,000
Time1–12 h

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

Parts involved

drive motor amotor temperature sensor

Related codes

P0A2AP0A2BP0A2DP0A2FP2DAE

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