P2B6D
Engine Coolant Flow Control Valve Position Sensor Circuit Intermittent/Erratic
The position sensor signal of the engine coolant flow control valve drops out or jumps intermittently. Loose connector or vibration-sensitive contact.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Sensor connector not seatedCommon
- Harness chafing intermittently shorts the wirePossible
- Connector with intermittent contact under vibrationLess likely
Parts involved
- Engine Coolant Flow Control Valve Position Sensor
- Wiring Harness
- ECM
P2B6D is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.