C0986 Diagnostic Trouble Code

C0986 is a kind of OBD-II Diagnostic C-Chassis 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 C0986 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
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.
Faulty IMRC actuator/sensor

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 C0986 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 C0986.

Fortunately, C0986 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0986 Trouble Code For Specific Cars

C0986 Moretti Ss Booster Mechanical Failure
C0986 Denzel Wd Hydraulic Pump Relay Circuit Failure
C0986 Hispano Suiza Barcelona Pedal Correlation PDS2 and HPDS
C0986 Mitsubishi Galant Autolamp Delay Increase Circuit Failure
C0986 Mitsubishi Proudia Aux Heater Coolant Sensor Circuit Short to Ground
C0986 Volvo 480 SCP (J1850) Invalid or Missing Data for Electric Traction Drive (Inverter)
C0986 Pontiac Executive Exhaust Pressure Sensor Low