What it means
The control module monitors charge-air-cooler fan operation when the fan is commanded on. It sets this code when the fan does not operate as expected, indicating a performance fault or that it may be stuck off.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The charge air cooler fan helps remove heat from the intercooler when the control module commands it on. The module compares expected fan operation with its response and sets this code when the fan does not run or perform as expected, including when the motor is seized or debris prevents it from turning.
Common causes
Most likely first.
- Fan motor seized
- Carbon or debris buildup preventing free movement
- Component wear with age - mechanical play
Symptoms
- Check-engine light
- Reduced engine power
- Higher intake-air temperature
- Possible engine protection warning
How to diagnose it
- Save the freeze-frame data and review live intake-air temperature and fan command or status data to see when the performance fault occurs.
- With the engine off and the fan safe to access, inspect the charge air cooler fan for debris, obstruction, damage, or visible signs that it cannot turn freely.
- Inspect the fan connector, wiring, and grounds for corrosion, damage, loose terminals, or signs of overheating.
- Use the manufacturer's procedure to command the fan on and check whether it responds and receives the expected circuit supply and control.
- If the wiring and command are correct but the fan remains off or sluggish, test the fan motor and control components against the manufacturer's specification.
Common fixes
- Remove debris or other obstruction preventing the charge air cooler fan from turning.
- Repair loose, corroded, or damaged fan wiring, terminals, or grounds.
- Replace the seized or worn charge air cooler fan motor if testing confirms failure.
- Repair or replace a failed fan control component identified by the manufacturer's diagnostic procedure.
Can I keep driving?
With a steady warning light and normal temperatures, limit driving and avoid sustained boost, towing, or hard acceleration until fan operation is restored. Stop if an engine protection warning appears, intake temperatures rise, or power is reduced, because the vehicle may be limiting output to protect the engine.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.