C127D Diagnostic Trouble Code

C127D 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 C127D 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.
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code C127D 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 C127D.

Fortunately, C127D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C127D Trouble Code For Specific Cars

C127D Citroen Xsara Fuel Rail Pressure Sensor Circuit Range/Performance
C127D Studebaker Avanti Lamp Turn Signal Rear Output Circuit Failure
C127D Maybach Exelero Transmission Transfer Case 2-Wheel Drive Solenoid Circuit Failure
C127D Fairthorpe Zeta Injector Circuit Malfunction - Cylinder 8
C127D Mercedes-benz 300 Air Bag Passenger Circuit Short to Ground - Loop #2
C127D Mercedes-benz Viano Air Suspension Height Sensor Power Circuit Open
C127D Bmw Isetta Closed Throttle Position Switch Malfunction