C2665 Diagnostic Trouble Code

C2665 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 C2665 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
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 :

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. 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 C2665 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 C2665.

Fortunately, C2665 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2665 Trouble Code For Specific Cars

C2665 Saab 90 Ignition Run/Start Circuit Failure
C2665 Mercedes-benz 400 Air Bag Passenger Pressure Switch Circuit Short To Ground
C2665 Goggomobil Fleetwing Parklamp Output Relay Dirver Short to Battery
C2665 Chrysler Howler Evaporative Emission Control System leak Detected (small leak)
C2665 Packard 120 Downstream Heated O2 Sensors Swapped
C2665 Toyota Cami O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
C2665 Pininfarina Rossa Evap Emission Control Sys Leak Detected (Gross Leak/No Flow)