Powertrain, generic · Hybrid propulsion

P0A2A Drive Motor A Temperature Sensor A Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

A thermistor in the stator of traction motor A reports winding temperature so the inverter can cut torque before the insulation overheats. P0A2A is the general circuit fault; the failure type sits in the extension byte. McLaren uses P0A2A1C on the Artura when a short or broken wire drives the sensor voltage out of range and P0A2A29 for an invalid signal. GM instead splits the electrical faults into P0A2C and P0A2D. Siblings: P0A2B plausibility, P0A2C low signal (hot), P0A2D high signal (cold or open), P0A2E dropouts, P0A2F real overheating; P2DAC is the same fault on a second sensor B. Hyundai shows the sensor sits inside the transaxle. Expect a hybrid warning and reduced electric power.

Likely causes

Broken or shorted sensor wire between motor and inverter
Loose or corroded connector at the drive unit
Thermistor failed inside the motor or transaxle
Faulty sensor input in the inverter/motor control module

Symptoms

  • Hybrid system warning or check engine light
  • Reduced electric drive power
  • Implausible motor temperature in live data

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 sensorwiring harness

Related codes

P0A2BP0A2CP0A2DP0A2EP0A2FP2DAC

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.