C127A Diagnostic Trouble Code

C127A 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 C127A diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. 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 C127A 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 C127A.

Fortunately, C127A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C127A Trouble Code For Specific Cars

C127A Bmw-isetta 600 Communication Bus Error (Non SCP)
C127A Pontiac Trans Sport Front Crash Sensor Internal Fault
C127A Ford Fpv Mirror Driver Drive Circuit Failure
C127A Rochet-schneider 30 Hydraulic Pressure Sensor Circuit Low Input
C127A Honda Inspire PSP Switch Out of Self Test Range
C127A Triumph Toledo Pedal Correlation PDS1 and PDS2
C127A Oldsmobile 76 Cylinder 5 Injector Circuit High