P2BDAMotor Electronics Coolant Temperature Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BDA is set when the sensor B signal in the electronics coolant loop falls below its valid window. These sensors are normally NTC thermistors, so a low voltage translates into an impossibly hot reading; a signal wire touching ground or a shorted sensor is the classic cause. No manufacturer documents P2BDA publicly. On sensor A of GM's 2013 Two-Mode hybrid trucks, the low fault P0A02 sets when the converted value reaches 162.1 °C in 30 of 50 samples taken every 100 ms, after propulsion has been active for more than 10 s; it is Type B. CARB requires such inputs to be tested against their valid limits. The opposite fault is P2BDB. The system may cut power because it believes the electronics are overheating.
- What you may notice
- Check engine light and hybrid system warning
- Scan tool shows an implausibly high electronics coolant temperature
- Power reduction even with a cold vehicle
- Likely causes
- LikelySignal wire of sensor B shorted to ground
- PossibleInternally shorted sensor B
- PossibleMoisture in the sensor connector creating a leakage path to ground
- RareFaulty input stage in the evaluating 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.