P0CF2Hybrid/EV Electronics Coolant Temperature Sensor A Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- This code catches a coolant temperature signal that jumps around faster than a liquid can actually change temperature, without necessarily leaving the valid voltage window. GM computes a string length: the controller adds up the absolute steps between four consecutive readings taken 250 ms apart. If that total exceeds 90 °C (2016 Volt, 19OBDG01) or 95 °C (16OBDG02), the window counts as failed; 4 of 5 windows, 5 of 7 windows or 1 s in a 1.25 s window then set the code, Type B, two trips. Loose terminals, a cracked solder joint in the sensor or a chafed wire that touches intermittently produce such spikes. Steady faults are P0CF0/P0CF1, a stable but wrong value P0CEF. The erratic reading can make the pump and power limits react without reason.
- What you may notice
- Malfunction indicator lamp, sometimes coming and going
- Coolant temperature value jumps in live data
- Pump speed or power limits change without reason
- Likely causes
- LikelyLoose or spread terminal in the sensor connector
- PossibleChafed wire making intermittent contact with ground or another circuit
- PossibleCracked internal connection in the sensor
- 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: €30 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.