B2849 Diagnostic Trouble Code

B2849 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 B2849 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

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.
Defective ECU strategies or components will prevent proper regeneration

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 at the plug wires to make sure they are not burnt or laying on the exhaust. 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 B2849 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 B2849.

Fortunately, B2849 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2849 Trouble Code For Specific Cars

B2849 Nissan Cefiro Climate Control Temperature Differential Circuit Short To Ground
B2849 Td Cars Td2000 Misfire Detected - Rough Road Data Not Available
B2849 Bristol Britannia Crankshaft Position Sensor B Circuit High Input
B2849 Suzuki Ignis Ii Mirror Driver Down Circuit Failure
B2849 Lagonda 2.5-litre Shift Solenoid D Control Circuit Range/Performance
B2849 Dodge Super 8 Ignition Tach Circuit Failure
B2849 Land Rover Discovery 4 Steering Phase A Circuit Short To Ground