OBD-II code · Powertrain (generic, extended)
P2C39 Cylinder Head Temperature Sensor B Range/Performance
The ECM detects a range/performance fault on the cylinder head temperature sensor b. Reading cannot be used reliably for control.
Is it safe to drive with P2C39?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySensor characteristic drifted
- PossibleSensor mounting displaced
- Less likelySensor element aged beyond calibration window
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Cylinder Head Temperature Sensor B, Wiring Harness, Ecm
Related codes
- P017BCylinder Head Temperature Sensor A Range/Performance
- P2C36Crankcase Pressure Sensor B Circuit Intermittent/Erratic
- P2C37Cold Start Engine Coolant Pump Performance
- P2C38Cylinder Head Temperature Sensor B Circuit
- P2C3ACylinder Head Temperature Sensor B Circuit Low
- P2C3BCylinder Head Temperature Sensor B Circuit High
- P2C3CCylinder Head Temperature Sensor B Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.