C1965 Diagnostic Trouble Code

C1965 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 C1965 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code C1965 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 C1965.

Fortunately, C1965 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1965 Trouble Code For Specific Cars

C1965 Ferrari 348 Intake Air Temperature Circuit High Input
C1965 Riley One-point-five Hydraulic Clutch Actuator Valve Circuit Failure
C1965 Koenigsegg Ccxr Servo Motor Potentiometer Coolair Circuit Short To Ground
C1965 Rovin Motocar Ignition Key-In Circuit Short To Battery
C1965 Ferrari 801 Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)
C1965 Sunbeam Rapier Manually Shifted Automatic (MSA) Sw Circuit Malf
C1965 Chrysler Viper Exhaust Pressure Sensor Low