B146B Diagnostic Trouble Code

B146B 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 B146B diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 B146B 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 B146B.

Fortunately, B146B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B146B Trouble Code For Specific Cars

B146B Chevrolet Malibu 7 EEPROM Malfunction
B146B Toyota Corolla O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
B146B Mercedes A 180 ABS Function Enabled Input Circuit Failure
B146B Dodge 024 Ignition Coil A Primary/Secondary Circuit Malfunction
B146B Daihatsu Copen Gear Shift Module Communication Circuit High
B146B Nsu Sport Cylinder 12 Injector Circuit High
B146B Honda Vigor Reverse Output Circuit