P028A code meaning
Charge Air Cooler Cooling Fan Control Circuit/Open
Powertrain system Generic code P02xx codes Check engine light
What P028A means
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.
P028A at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P028A
- Check engine light on
- Fan does not run
- Loss of power in heat or traffic
- Follow-up code P026A possible
Common causes of P028A
- Most likelyWire or connector to the fan open or corroded
- PossibleFan relay or fan control module faulty
- PossibleFan motor open internally
- Less likelyFuse blown
- Less likelyDriver stage in the engine module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Charge air cooler fanFan relayFan wiring
What each part of P028A means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2 | Area: fuel and air metering (injector circuit). |
| 8A | The exact fault in that area. |
What to do next
- Note P028A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P028A
What does P028A mean?
P028A means "Charge Air Cooler Cooling Fan Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P028A?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P028A fail an emissions test?
Yes, it can. P028A is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P028A to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P028A clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.