Powertrain, generic · Fuel and air metering (injector circuit)
P028A Charge Air Cooler Cooling Fan Control Circuit/Open
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; 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.
Likely causes
Wire or connector to the fan open or corroded
Fan relay or fan control module faulty
Fan motor open internally
Fuse blown
Driver stage in the engine module faulty
Symptoms
- Check engine light on
- Fan does not run
- Loss of power in heat or traffic
- Follow-up code P026A possible
Repair estimate
DifficultyMediumDIY possible
Parts and labour€30–500
Time0.5–2 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
charge air cooler fanfan relayfan wiring
Related codes
References: law.cornell.edu, patents.google.com.