C0048 Diagnostic Trouble Code

C0048 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 C0048 diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Poor acceleration

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 C0048 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 C0048.

Fortunately, C0048 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0048 Trouble Code For Specific Cars

C0048 Bmw 2800 Can Link ECM/ABSCM Circuit / Network Malfunction
C0048 Fiat 507 Lamp Backup Switch Input Circuit Open
C0048 Buick 6 Cylinder 4 Contribution/Balance Fault
C0048 Bmw 428 Chime Circuit Failure
C0048 Fiat Tipo Left Front Sensor Circuit Fault
C0048 Mercedes-benz Cw Air Suspension Compressor Relay Circuit Short To Ground
C0048 Peugeot 1007 Dual Alternator Upper Fault