P2BD8Motor Electronics Coolant Temperature Sensor B Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyLoose, unplugged or corroded connector at sensor B
- PossibleDamaged signal or reference wire between sensor B and the module
- PossibleFailed thermistor in sensor B
- RareFaulty input circuit in the controlling module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.