B1985 Diagnostic Trouble Code

B1985 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 B1985 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
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 :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. 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 B1985 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 B1985.

Fortunately, B1985 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1985 Trouble Code For Specific Cars

B1985 Bmw Serie 6 Clutch Solenoid Circuit Malfunction
B1985 Mercedes-benz Cls Class Air Suspension Compressor Relay Circuit Open
B1985 Mercedes Vaneo Air Bag Driver Circuit Resistance Low or Shorted Together
B1985 Pontiac Phoenix Fan Secondary Low With High Fan On
B1985 Gmc Terra Park Brake Switch # 2 Applied Circuit Short to Gnd
B1985 Bugatti Type 15 Cylinder #7 High To Low Side Short
B1985 Infiniti I30