B2784 Diagnostic Trouble Code

B2784 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 B2784 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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 :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code B2784 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 B2784.

Fortunately, B2784 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2784 Trouble Code For Specific Cars

B2784 Volkswagen 1303 Rear Cargo Door Set Switch Stuck (Short to Ground)
B2784 Daihatsu Rocky Glow Plug Circuit High Side, High Input
B2784 Durant Star Immobilizer Code Not Programmed
B2784 Land Rover Discovery 3 Steering EVO Out-of-Range Fault
B2784 Shelby 1 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
B2784 Chevrolet El Camino Drivers Seat Belt Buckle Switch Circuit Open
B2784 Crossley Shelsley Fuel Tank Pressure Sensor Circuit Failure