OBD-II code · Powertrain (generic, extended)
P2BB9 Engine Coolant Temperature Sensor 6 Circuit High
The ECM detects a circuit high fault on the engine coolant temperature sensor 6. Reading cannot be used reliably for control.
Is it safe to drive with P2BB9?
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 B+
- PossibleOpen sensor
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Cooling fan runs constantly or not at all
- Cabin heater weak or excessively hot
- Possible long warm-up time or hard cold start
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
- Engine Coolant Temperature Sensor 6, Wiring Harness, Ecm
Related codes
- P01E6Engine Coolant Temperature Sensor 3 Circuit High
- P2185Engine Coolant Temperature Sensor 2 Circuit High
- P2AFFEngine Coolant Temperature Sensor 4 Circuit High
- P2B2EEngine Coolant Temperature Sensor 5 Circuit High
- P2BB6Engine Coolant Temperature Sensor 6 Circuit
- P2BB7Engine Coolant Temperature Sensor 6 Range/Performance
- P2BB8Engine Coolant Temperature Sensor 6 Circuit Low
- P2BBAEngine Coolant Temperature Sensor 6 Circuit Intermittent/Erratic
- P2BBBTurbocharger/Supercharger Bypass Valve A Position Sensor Circuit
- P2BBCTurbocharger/Supercharger Bypass Valve A Position Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.