C1065 Diagnostic Trouble Code

C1065 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 C1065 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code C1065 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 C1065.

Fortunately, C1065 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1065 Trouble Code For Specific Cars

C1065 Bristol 403 Cooling Fan Power/Ground Circuit Malfunction
C1065 Citroen 10 Hp Fan Control Circuit Malfunction
C1065 Lincoln Capri Throttle Position Input Out of Range Low
C1065 Porsche 911 Type 991 FTS High - Fuel Pump Temperature Sensor High
C1065 Suzuki Alto Vi Memory 1 Switch Circuit Open
C1065 Dodge Kingsway Ignition Cylinder Sensor Open Circuit
C1065 Panoz Q9 Driver Power Window Up Switch Circuit Failure