B1815 Diagnostic Trouble Code

B1815 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 B1815 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
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
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code B1815 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 B1815.

Fortunately, B1815 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1815 Trouble Code For Specific Cars

B1815 Toyota Sport Passenger Airbag Disable Module Sensor Obstructed
B1815 Opel Lotus Door Ajar Circuit Failure
B1815 Maserati Mistral Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance
B1815 Jeep Cj Seat Driver Rear Down Switch Circuit Open
B1815 Bmw Serie 1 Clutch Position Fault
B1815 Porsche 912 Fuel Composition Sensor Circuit Low Input
B1815 Nissan 720 Climate Control A/C Post Evaporator Sensor Circuit Failure