OBD-II code · Powertrain (generic, extended)
P2C3A Cylinder Head Temperature Sensor B Circuit Low
The ECM detects a circuit low fault on the cylinder head temperature sensor b circuit. Reading cannot be used reliably for control.
Is it safe to drive with P2C3A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- PossibleInternal sensor short
- Less likelyConnector pins corroded - high contact resistance
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
- P2C37Cold Start Engine Coolant Pump Performance
- P2C38Cylinder Head Temperature Sensor B Circuit
- P2C39Cylinder Head Temperature Sensor B Range/Performance
- P2C3BCylinder Head Temperature Sensor B Circuit High
- P2C3CCylinder Head Temperature Sensor B Circuit Intermittent/Erratic
- P2C3DCylinder Head Temperature Sensor A/B Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.