B2771 Diagnostic Trouble Code

B2771 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 B2771 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
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
Fuel with a large percentage of sulfur will clog the DPF quickly

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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code B2771 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 B2771.

Fortunately, B2771 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2771 Trouble Code For Specific Cars

B2771 Chevrolet Constantia Driver Sid, Side mount Airbag Low resistance on Squib
B2771 Invicta 4.5-litre
B2771 Talbot 2500 Mirror Passenger Horizontal Feedback Potentiometer Circuit Open
B2771 Bugatti Chiron Cylinder #3 High To Low Side Short
B2771 Buick 2235 Cylinder 3 Contribution/Balance Fault
B2771 Nsu Autonova Cylinder 11 Injector Circuit High
B2771 De Tomaso Bigua Horn Relay Coil Circuit Short to Vbatt