P0B48 Diagnostic Trouble Code

P0B48 is a kind of OBD-II Diagnostic P-Powertrain 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 P0B48 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
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.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P0B48 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 P0B48.

Fortunately, P0B48 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0B48 Trouble Code For Specific Cars

P0B48 Vauxhall Victor Pressure Control Solenoid Malfunction
P0B48 Seat Alhambra Injector Circuit Malfunction - Cylinder 7
P0B48 Infiniti Fx30
P0B48 Panhard 120 Driver Power Window Down Circuit Open
P0B48 Rolls-royce 20 Hydraulic Pressure Unit Cycling Period Too Short
P0B48 Diatto Type 20 Hydraulic Pump Relay Circuit Low
P0B48 Vauxhall Chevette Pressure Control Solenoid "B" Open Circuit