B0378 Diagnostic Trouble Code

B0378 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 B0378 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
Diminished fuel efficiency

Possible Causes :

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.
Defective ECU strategies or components will prevent proper regeneration
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. 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.

Process Tips

Diagnostic trouble code B0378 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 B0378.

Fortunately, B0378 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0378 Trouble Code For Specific Cars

B0378 Honda Domani Pressure Transducer Main / Primary Input Circuit Failure
B0378 Ferrari 330 Insufficient RMP Increase During Spark Test
B0378 Innocenti A40 SCP (J1850) Invalid or Missing Data for Gateway
B0378 Mercedes-benz Slk Class Air Suspension Front Inflator Solenoid Output Circuit Short To Battery
B0378 Lada Vesta Shift Solenoid C Malfunction
B0378 Lexus Is TCM Power Relay Control Circuit High
B0378 Acura Rsx ABS Inlet Valve Coil LR Circuit Failure