P00B7
Engine Coolant Flow Low/Performance
Coolant flow through the engine is below the expected level. Risk of overheating.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Water pump impeller broken or wornCommon
- Coolant passage blockedPossible
Parts involved
- Water Pump
- Coolant Lines
- Thermostat
P00B7 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.