P0EC3A/C Refrigerant Temperature Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P0EC3 stands for a sensor B signal pulled down toward ground. Because a thermistor of the NTC type lowers its resistance as it warms, the module reads a refrigerant temperature far above anything the system could reach. Typical culprits are a harness pinched against the body, water inside the plug or a sensor that has failed shorted. P0EC3 appears in no public manufacturer document. GM's evaporator sensor check on the 2012 Volt (P0537, below roughly 0.1 V, two trips) is the nearest documented model. On cars that cool the traction battery through the refrigerant loop the controller may restrict that cooling as well as the cabin A/C. Open-circuit side: P0EC2; sensor A equivalent: P0EBE.
- What you may notice
- A/C compressor held off, cabin not cooled
- Charging or driving power possibly limited if battery cooling depends on the loop
- Likely causes
- LikelyHarness pinched against the body, signal shorted to ground
- PossibleWater ingress in the sensor plug
- PossibleSensor B shorted internally
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.