Powertrain, generic · Hybrid propulsion

P0BDA Drive Motor Inverter Temperature Sensor D Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P0BDA covers an inverter temperature sensor D signal that changes in steps or drops out briefly. Real temperatures of a liquid-cooled inverter move smoothly, so such jumps suggest a contact problem or interference from the high-voltage switching, which a Hitachi patent on inverter systems names as a typical disturbance of the small sensor signal. No manufacturer documents this exact code publicly; GM's tables cover sensor D, the second sensor of the motor B inverter, only with P0BD7, P0BD8 and P0BD9. CARB requires hybrid sensor inputs to be monitored for erratic behaviour as well. Because the fault comes and goes, freeze-frame data and live data during a wiggle test are the most useful clues.

Likely causes

Loose or corroded contact at the inverter module
Intermittent fault inside the power inverter module
Interference from the high-voltage circuit on the sensor signal

Symptoms

  • Warning lamp that comes and goes
  • Brief power reductions while driving
  • Jumping inverter temperature in live data

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–6 h

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

Parts involved

drive motor inverter temp sensor dwiring harnesshybrid control module

Related codes

P0BD6P0BD7P0BD8P0BD9P0AF6P0BD5

References: law.cornell.edu, patents.google.com, gsi.ext.gm.com.