C0959 Diagnostic Trouble Code

C0959 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 C0959 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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 :

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C0959 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 C0959.

Fortunately, C0959 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0959 Trouble Code For Specific Cars

C0959 Hillman Super Minx PCM - IDM Communications Error
C0959 Dodge Kingsway Ignition Cylinder Sensor Open Circuit
C0959 Alvis Tb Air Pump Circuit Malfunction/ (AIR) System Bank 1
C0959 Nissan Cedric Climate Control Temperature Differential Circuit Short To Battery
C0959 Lada 21 Shift Solenoid A Control Circuit Low
C0959 Mercedes Vaneo Air Bag Driver Circuit Resistance Low or Shorted Together
C0959 Lancia Medusa Split Air #1 Circuit Malfunction