C0027 Diagnostic Trouble Code

C0027 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 C0027 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
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. 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 C0027 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 C0027.

Fortunately, C0027 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0027 Trouble Code For Specific Cars

C0027 Bmw X6 Column Reach Feedback Potentiometer Circuit Short to Ground
C0027 Daihatsu Move Glass Break Sensor Failure
C0027 La Fayette 6 Servo Motor Potentiometer Foot Circuit Short To Battery
C0027 Toyota Aygo O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
C0027 Dodge Wc Ignition Tamper Circuit Failure
C0027 Maserati 6 Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
C0027 Ford Fairmont