P2B59
Engine Coolant Flow Control Valve Control Circuit/Open
The engine coolant flow control valve reports a control circuit/open condition. Coolant routing between engine and radiator branches cannot be commanded as expected.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open in valve control wireCommon
- Open valve motorPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Engine Coolant Flow Control Valve
- Wiring Harness
- ECM
P2B59 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.