Powertrain, generic · Fuel and air metering (injector circuit)

P028F Charge Air Cooler Cooling Fan Control Circuit Driver Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Fan motor or wiring shorted (driver overload)
Driver in the engine or fan module faulty
Supply voltage or ground of the module poor

Symptoms

  • Warning light (manufacturer-dependent)
  • Loss of power in heat or at low speed
  • High charge air temperature, possibly P026A

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–700
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

charge air cooler fanfan relayfan wiringengine control module

Related codes

P028AP028BP028CP028DP028EP026A

References: law.cornell.edu, patents.google.com.