P028BCharge Air Cooler Cooling Fan Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- 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. P028B means the module commands the fan on but sees no effect – no speed or current feedback from a fan control module, or the charge air does not cool – although the circuit is electrically sound (circuit faults are P028A, P028D and P028E). The charge air then gets hotter, which can limit boost and power. 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 seized or worn
- PossibleFan blocked (debris, dirt, ice)
- PossibleFan relay or fan control module without output
- RareFan fuse or supply
- 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: €80 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.