C2528 Diagnostic Trouble Code

C2528 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C2528 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Faulty IMRC actuator/sensor

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C2528 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C2528.

Fortunately, C2528 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2528 Trouble Code For Specific Cars

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C2528 Opel Astra K Decklid Ajar Rear Door Circuit Open
C2528 Audi 4000 All Doors Unlock Relay Circuit Failure
C2528 Saturn Outlook Immobilizer/ECM Communication Error
C2528 Audi S6 Audio Compact Disk / Disk Jockey Unit is Not Responding
C2528 Maserati Khamsin Transmission Fluid Pressure Sensor/Switch E Circuit Intermittent