C2689 Diagnostic Trouble Code

C2689 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 C2689 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
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

Possible Causes :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code C2689 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 C2689.

Fortunately, C2689 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2689 Trouble Code For Specific Cars

C2689 Renault Modus Heated Backlite Relay Circuit Open
C2689 Toyota Sport Passenger Airbag Disable Module Sensor Obstructed
C2689 Buick Lacrosse Cylinder 8 Injector Circuit High
C2689 Allard Lwb Air Bag Driver Circuit Resistance Low or Shorted Together
C2689 Opel Gt Dim Panel Increase Input Circuit Short To Battery
C2689 Rover 600 Ignition Coil C Primary/Secondary Circuit Malfunction
C2689 Toyota Camry O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)