B0078 Diagnostic Trouble Code

B0078 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 B0078 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
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

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

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.

Process Tips

Diagnostic trouble code B0078 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 B0078.

Fortunately, B0078 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0078 Trouble Code For Specific Cars

B0078 Infiniti Q45 SCP (J1850) Invalid or Missing Data for External Lamps
B0078 Lamborghini Espada Shift Time Too Short
B0078 Bmw X6 Column Reach Feedback Potentiometer Circuit Short to Ground
B0078 Mercedes-benz Cls Class Air Suspension Compressor Relay Circuit Open
B0078 Lexus Lf TCM Power Relay Sense Circuit Low
B0078 Asa 1000 Air Suspension Reservoir Pneumatic Failure
B0078 Citroen C1 Ii Front Sounder Circuit Short to Vbatt