B0999 Diagnostic Trouble Code

B0999 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 B0999 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
Diminished fuel efficiency

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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. 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.

Process Tips

Diagnostic trouble code B0999 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 B0999.

Fortunately, B0999 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0999 Trouble Code For Specific Cars

B0999 Hillman Super Minx PCM - IDM Communications Error
B0999 Mercedes E 300 ABS Pump Switch Circuit Failure
B0999 Hyundai Stellar
B0999 Allard Safari Air Bag Driver Inflator Circuit Resistance Low on Squib - Loop #2
B0999 Rover 2300 Ignition Coil - Cylinder 1 - Early Activation Fault
B0999 Moretti 850 Blend Door Failure
B0999 Jowett 9 Seat Headrest Feedback Potentiometer Circuit Open