P028ACharge Air Cooler Cooling Fan Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some vehicles – mainly commercial and off-road machines, or cars with a separate cooler for a coolant-cooled charge air cooler – have their own fan for the charge air cooler; a Deere patent describes such a fan that the module switches and reverses to blow out dirt. P028A means the fan's control circuit is open or has a general fault, detected by the driver stage. Without the fan the charge air is cooled less at low speed or in heat, which can lead to P026A and boost limitation. No manufacturer document using P028A was found; the description rests on CARB's output component requirement.
- What you may notice
- Check engine light on
- Fan does not run
- Loss of power in heat or traffic
- Follow-up code P026A possible
- Likely causes
- LikelyWire or connector to the fan open or corroded
- PossibleFan relay or fan control module faulty
- PossibleFan motor open internally
- RareFuse blown
- RareDriver stage in the engine module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.