B2958 Diagnostic Trouble Code

B2958 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 B2958 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 :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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 at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B2958 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 B2958.

Fortunately, B2958 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2958 Trouble Code For Specific Cars

B2958 Napier 8 CAN Communication Bus Fault
B2958 Volvo 120
B2958 Caterham 1700 Door Ajar LR Circuit Failure
B2958 Simca 11 Intake Manifold Runner Control (Bank 1) Stuck Open
B2958 Bentley 3-litre Battery Module Fault
B2958 Renault Express Generator Control Circuit Malfunction
B2958 Audi 75 Alternator Load Input Failed High