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DTC codes / P02xx · Fuel and air metering (injector circuits) / P028F
P028F indicates that the powertrain control module (PCM) has detected a performance fault in the control circuit for the charge air cooler cooling fan, which is an auxiliary fan used to lower the temperature of the compressed intake air after the turbocharger. The computer monitors the driver circuit for expected electrical behavior and sets this code when the circuit does not respond as commanded, often due to an open, short, or faulty driver inside the PCM.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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