P0EC1A/C Refrigerant Temperature Sensor B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EC1 covers a circuit fault of a second refrigerant temperature sensor, found mainly on electrified cars whose heat pump or battery chiller measures the refrigerant at several points. The module receives no usable value from sensor B. No manufacturer publishes P0EC1 or says which of its sensors counts as B. Volkswagen's e-Golf shows how such networks look: up to five combined pressure/temperature senders (G395, G826 to G829) share two LIN lines, and because early parts could not be auto-addressed, bulletin 87-17-02 requires replacing every sender on the affected line. Without B the heat pump or A/C may shut down. Detailed faults of sensor B: P0EC2 to P0EC4; sensor A: P0EBC.
- What you may notice
- Heat pump or A/C switched off or limited
- Fault stored in the climate control module
- Likely causes
- LikelyFailed sensor B or combined pressure/temperature sender
- PossibleWiring, connector or shared LIN line fault
- RareMixed part versions on one LIN line after a repair
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €120 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.