OBD-II code · Powertrain (generic)
P0EC9 A/C Refrigerant Temperature Sensor B Circuit Range/Performance
The ECM detects a range/performance fault on the a/c refrigerant temperature sensor b circuit. Reading cannot be used reliably for control.
Is it safe to drive with P0EC9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySensor characteristic drifted
- PossibleSensor mounting displaced
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- AC Refrigerant Temp Sensor B, Wiring Harness
Related codes
- P0EC4A/C Refrigerant Temperature Sensor A Circuit Range/Performance
- P0EC6A/C Refrigerant Temperature Sensor A Circuit High
- P0EC7A/C Refrigerant Temperature Sensor A Circuit Intermittent/Erratic
- P0EC8A/C Refrigerant Temperature Sensor B Circuit
- P0ECAA/C Refrigerant Temperature Sensor B Circuit Low
- P0ECBA/C Refrigerant Temperature Sensor B Circuit High
- P0ECCA/C Refrigerant Temperature Sensor B Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.