B2992 Diagnostic Trouble Code

B2992 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 B2992 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
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 :

Defective ECU strategies or components will prevent proper regeneration
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.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B2992 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 B2992.

Fortunately, B2992 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2992 Trouble Code For Specific Cars

B2992 Infiniti Q45 SCP (J1850) Invalid or Missing Data for External Lamps
B2992 Dacia Logan Ii Fuel Temperature Sensor A Circuit Malfunction
B2992 Mercedes Sprinter Air Bag Driver Circuit Open - Loop #2
B2992 Sunbeam-talbot 90 Mass or Volume Air flow Circuit Range/Performance Problem
B2992 Lamborghini Urraco Speed Control Actuator Assembly Cable Release Failure
B2992 Atalanta 1.5-litre Air Temperature External Sensor Circuit Short To Ground
B2992 American Roadster Air Suspension Height Sensor Power Circuit Short To Battery