C207A Diagnostic Trouble Code

C207A 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 C207A diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C207A 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 C207A.

Fortunately, C207A is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C207A Trouble Code For Specific Cars

C207A Durkopp 40 Hp Immobilizer/ECM Communication Error
C207A Lotus Esprit Traction Control Module Request Circuit Failure
C207A Lamborghini Jarama Signal Link Short to Ground (Non SCP) / From NGV Module
C207A Fiat Panda 3 Lamp Turn Signal Right Circuit Short To Battery
C207A Peugeot Touareg Engine Oil Pressure Sensor/Switch Range/Performance
C207A Hillman Speed PATS Received Invalid Format Of Key-Code From Ignition Key Transponder
C207A Daihatsu Micros Generator Field "F" Control Circuit Malfunction