P2BDCMotor Electronics Coolant Temperature Sensor C 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
- P2BDC reports a general fault in the circuit of coolant temperature sensor C, a third measuring point that some drives use in the loop cooling the inverter, converter and motor. The code stands for a signal the module cannot use without assigning it to the low, high or plausibility codes P2BDE, P2BDF and P2BDD. No manufacturer documents P2BDC, or a third sensor of this kind, publicly. As a guide to what such a module accepts as a valid signal, GM's 2011 Volt tables keep their single electronics coolant sensor between 2 % and 98 % of the 5 V reference and treat an exit from that window in 16 out of 20 readings, one every 250 ms, as a Type B fault. CARB requires circuit checks on these inputs. Without the value, cooling falls back to safe defaults.
- What you may notice
- Warning lamp for the hybrid or drive system
- Fan and electronics pump running at high output as a precaution
- Possibly reduced electric power
- Likely causes
- LikelyPoor contact at the sensor C connector
- PossibleChafed or broken wiring between sensor C and the module
- PossibleDefective sensor C
- RareFault on a 5 V reference or sensor ground shared with other sensors
- 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.