Powertrain, generic · Fuel and air metering (injector circuit)
P028E Charge Air Cooler Cooling Fan Control Circuit High
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. P028E means the fan's control circuit reads high – typically the control wire shorted to voltage or, on some drivers, an open circuit, detected by the driver stage. The fan then cannot be switched as commanded. No manufacturer document using this code was found; the description rests on CARB's output component requirement.
Likely causes
Control wire shorted to voltage
Control wire open (on some drivers)
Moisture or corrosion in the connector
Driver stage in the engine module faulty
Symptoms
- Warning light (manufacturer-dependent)
- Fan does not switch as commanded
- Loss of power in heat possible
Repair estimate
DifficultyMediumDIY possible
Parts and labour€30–300
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.