P0EA9
Auxiliary Cooling System Performance
The auxiliary cooling system performance is below calibration. Coolant flow or temperature drop insufficient under load.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Aux pump output degradedCommon
- Radiator partially blockedPossible
Parts involved
- Aux Cooling Pump
- Aux Cooling Radiator
- Aux Cooling Fan
P0EA9 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.