C0989 Diagnostic Trouble Code

C0989 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 C0989 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 :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 C0989 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 C0989.

Fortunately, C0989 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0989 Trouble Code For Specific Cars

C0989 Aston Martin Db1 Air Suspension RR Air Compress Request Exceeded Max Timing
C0989 Hyundai Xg350 SCP (J1850) Invalid or Missing Data for Engine Systems Other
C0989 Nissan Primera Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor B)
C0989 Lancia Ardea Speed Wheel Sensor All Coherency Failure
C0989 Mercedes Sl 350 Air Bag Crash Sensor #2 Feed/Return Circuit Failure
C0989 Kia Sportage 3 Serial Communication Link Malfunction
C0989 Lagonda 12 Shift Solenoid D Control Circuit High