P2BDFMotor Electronics Coolant Temperature Sensor C Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2BDF is stored when the signal of coolant temperature sensor C climbs to nearly the full reference voltage. For the module this looks like coolant colder than any climate allows; in practice a pin that has backed out of the connector, a corroded or broken signal wire, or a short to a voltage source is behind it. No manufacturer documents P2BDF publicly. GM sets the matching code for its single electronics coolant sensor, P0CF1, above 98 % of the 5 V reference (4.9 V): 16 of 20 samples at 250 ms in the 2011 Volt tables, 4 s within a 5 s window in the 2019 tables, Type B in both. CARB requires out-of-range checks on all inverter cooling inputs. The low counterpart is P2BDE, sensor B uses P2BDB. A warning lamp and reduced power are possible.
- What you may notice
- Check engine or hybrid system warning
- Live data shows the lowest possible temperature for sensor C
- Pump and fan running in a fixed protective mode
- Likely causes
- LikelyBacked-out or loose pin in the sensor C connector
- PossibleCorroded or broken signal wire of sensor C
- PossibleOpen circuit inside sensor C
- RareSignal wire shorted to the 5 V reference or another supply
- 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: €40 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.