P028FCharge Air Cooler Cooling Fan Control Circuit Driver Performance
- 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, switched by the engine module; a Deere patent describes such a fan that is also reversed to blow out dirt. P028F concerns the driver stage that switches the fan: it reports an internal fault such as overcurrent or overheating, or its diagnosis does not match the command. A shorted fan motor or wiring can overload the driver; otherwise the driver in the engine or fan module is faulty. No manufacturer document using this code was found; the description rests on CARB's output component requirement.
- What you may notice
- Warning light (manufacturer-dependent)
- Loss of power in heat or at low speed
- High charge air temperature, possibly P026A
- Likely causes
- LikelyFan motor or wiring shorted (driver overload)
- PossibleDriver in the engine or fan module faulty
- RareSupply voltage or ground of the module poor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.