Powertrain, generic · Hybrid propulsion

P0A34 Drive Motor B Temperature Sensor Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0A34 covers a motor B temperature signal that drops out or jumps for short moments instead of failing permanently. A winding temperature cannot change by tens of degrees within milliseconds, so such steps point to a loose contact, a chafed wire or a cracked solder joint. No manufacturer documents P0A34 publicly; GM and Mitsubishi only list the permanent faults P0A32 and P0A33 for this sensor, with debounce times of a few hundred milliseconds to seconds that a brief dropout may not meet. CARB 1968.2 requires circuit monitoring of emission-relevant hybrid components. The fault often comes and goes with vibration or heat, and the hybrid system may limit electric drive while it is active.

Likely causes

Loose or fretting terminal in the sensor connector
Wire insulation chafed through at a moving harness section
Cracked joint at the thermistor leads inside the motor

Symptoms

  • Hybrid warning that appears and clears on its own
  • Motor B temperature jumps in live data
  • Occasional loss of electric drive power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–3,000
Time1–6 h

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

Parts involved

drive motor b temp sensorwiring harnesshybrid control module

Related codes

P0A30P0A32P0A33P0A31P0A2E

References: law.cornell.edu, gsi.ext.gm.com, mitsubishitechinfo.com.