B2986 Diagnostic Trouble Code

B2986 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 B2986 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code B2986 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 B2986.

Fortunately, B2986 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2986 Trouble Code For Specific Cars

B2986 Mercedes-benz Cls Class Air Suspension Compressor Relay Circuit Open
B2986 Beijing Bj 750 Bank 2 Fuel Control Shifted Lean
B2986 Mazda Roadpacer 4X4 Initialization Failure
B2986 Chiribiri Chiribiri Engine Coolant Temperature Signal Missing/Fault
B2986 Ferrari F310 Intermediate Shaft Speed Sensor Circuit No signal
B2986 Ford Zx2 Motor Temperature Out of Range
B2986 Volkswagen Sedan SCAIR Solenoid Circuit Malfunction