OBD-II code · Powertrain (generic)
P0EA9 Auxiliary Cooling System Performance
The auxiliary cooling system performance is below calibration. Coolant flow or temperature drop insufficient under load.
Is it safe to drive with P0EA9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAux pump output degraded
- PossibleRadiator partially blocked
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Aux Cooling Pump, Aux Cooling Radiator, Aux Cooling Fan
Related codes
- P0EA6DC/DC Converter Current Sensor C Circuit High
- P0EA7DC/DC Converter Current Sensor C Circuit Intermittent/Erratic
- P0EA8DC/DC Converter B Performance
- P0EAAA/C Compressor Motor Voltage Sensor B Circuit
- P0EABA/C Compressor Motor Voltage Sensor B Circuit Range/Performance
- P0EACA/C Compressor Motor Voltage Sensor B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.