P0CF1Hybrid/EV Electronics Coolant Temperature Sensor A 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
- The sensor signal rises nearly to the 5 V reference, the typical picture of an open circuit, an unplugged connector or a signal wire shorted to voltage. GM sets it above 98 % of the reference (4.9 V) in all published tables from the 2011 Volt to the 2019 HPC2 controller, 16 of 20 samples at 250 ms or 4 s within 5 s, Type B, two trips. Chrysler's Pacifica Hybrid shows it in practice: STAR case S2008000119 (2020, revised 2021) links P0CF1 together with P1B71-00 and B12B0-00 and the message Service Hybrid Electrical System to water entering the grey 16-pin inline connector XY291A under the battery skid plate. Cleaning and dielectric grease cure light moisture; corroded pins mean new dash and underbody harnesses. P0CF0 is the grounded counterpart.
- What you may notice
- Service Hybrid Electrical System or similar warning
- Scan tool shows an implausibly low coolant temperature
- Charging or drive power limited
- Likely causes
- LikelyWater or corrosion in an underbody inline connector (Chrysler Pacifica Hybrid XY291A)
- LikelyOpen signal or ground wire, or unplugged sensor
- PossibleSensor element open internally
- RareSignal wire shorted to a voltage source
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.