B278D Diagnostic Trouble Code

B278D 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 B278D 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 :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

Process Tips

Diagnostic trouble code B278D 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 B278D.

Fortunately, B278D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B278D Trouble Code For Specific Cars

B278D Wartburg 311 SCP (J1850) Invalid or Missing Data for Interior Lamp Outage
B278D Autobianchi Stellina Aux Heater Flame Sensor Circuit Open
B278D Isuzu Irmscher SCP (J1850) Invalid or Missing Data for Traction Motor
B278D Suzuki Sj Mirror Driver Memory Position Error
B278D Bentley Continental Battery Power Supply ECU Circuit Short To Battery
B278D Mercedes B 200 ABS Hydraulic Pump Motor Circuit Failure
B278D Mercedes Clk 500 ABS Outlet Valve Coil Rear Circuit Open