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 Ds Ds7 Crossback Ignition/Distributor Engine Speed Input Circuit Range/Performance
B2784 Lea-francis 18 System Voltage Unstable
B2784 Honda Concerto Pressure Control Solenoid Intermittent
B2784 Volkswagen Quantum RPM Input Circuit Failure
B2784 Daimler 4-litre Head Lamp Relay Coil Short to Battery
B2784 Turner 1500 Pedal Position Sensor B Circuit Intermittent
B2784 Bristol 410 Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor B)