Powertrain, generic (extended)

P2BD8 Motor Electronics Coolant Temperature Sensor B Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Some hybrid and electric drives measure the coolant in the inverter and motor electronics loop at more than one point; J2012 names these sensors A, B and C, and which spot each letter marks is left to the manufacturer. P2BD8 is the general circuit code for sensor B: the signal cannot be used, but none of the specific low, high or plausibility verdicts applies. No manufacturer documents P2BD8 publicly. For sensor A, GM's 2013 Two-Mode hybrid trucks only use the specific codes P0A01 to P0A03, and CARB obliges makers to monitor the electrical inputs used for inverter cooling. Low and high faults of sensor B are P2BDA and P2BDB, plausibility P2BD9. Without a reading the system usually runs the pump harder and may limit power.

Likely causes

Loose, unplugged or corroded connector at sensor B
Damaged signal or reference wire between sensor B and the module
Failed thermistor in sensor B
Faulty input circuit in the controlling module

Symptoms

  • Hybrid or drive system warning, often with the check engine light
  • Electronics coolant pump and fan running more than usual
  • Possible reduction of electric drive power

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2.5 h

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

Parts involved

motor electronics coolant temp sensor bwiring harnesshybrid control module

Related codes

P2BD9P2BDAP2BDBP2BDCP0A00

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