OBD-II code · Powertrain (generic, extended)
P2B5B Engine Coolant Flow Control Valve Control Circuit High
The engine coolant flow control valve reports a control circuit high condition. Coolant routing between engine and radiator branches cannot be commanded as expected.
Is it safe to drive with P2B5B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl wire shorted to B+
- PossibleOpen valve motor
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Engine Coolant Flow Control Valve, Wiring Harness, Ecm
Related codes
- P2B58Engine Coolant Flow Control Valve Motor Current High
- P2B59Engine Coolant Flow Control Valve Control Circuit/Open
- P2B5AEngine Coolant Flow Control Valve Control Circuit Low
- P2B5CEngine Coolant Flow Control Valve Supply Circuit Low
- P2B5DEngine Coolant Flow Control Valve Position Sensor Circuit
- P2B5EEngine Coolant Flow Control Valve Position Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.