P2B9E
Coolant Pump A Control Module Overtemperature
Coolant pump A reports a control module overtemperature condition. Coolant circulation through the affected loop cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Ambient or under-bonnet temperature too highCommon
- Module cooling path blockedPossible
Parts involved
- Coolant Pump A
- Wiring Harness
- ECM
P2B9E 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.