B0048 Diagnostic Trouble Code

B0048 is a kind of OBD-II Diagnostic B-Body 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 B0048 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Engine surge

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.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B0048 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 B0048.

Fortunately, B0048 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0048 Trouble Code For Specific Cars

B0048 Abarth Grande Punto A/C Clutch Magnetic Control Circuit Failure
B0048 Fiat 131 Knock Sensor 2 Circuit Low Input (Bank 2)
B0048 Plymouth Cambridge Evaporative Emission Control System Pressure Sensor High Input
B0048 Crossley Shelsley Fuel Tank Pressure Sensor Circuit Failure
B0048 Singer Gazelle Internal Vref Malfunction
B0048 Peugeot Quasar Engine Coolant Temperature Circuit Range/Performance Problem
B0048 Vaz 2120 PRNDL Input #3 Circuit Failure