C212D Diagnostic Trouble Code

C212D 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 C212D 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
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Defective ECU strategies or components will prevent proper regeneration

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. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code C212D 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 C212D.

Fortunately, C212D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C212D Trouble Code For Specific Cars

C212D Alfa Romeo 1750 ABS Power Relay Output Circuit Failure
C212D Simca 2 Litres Intake Valve Control Solenoid Circuit Low (Bank 1)
C212D Nissan Armada Climate Control Air Temperature Internal Sensor Motor Circuit Failure
C212D Maserati Boomerang Transmission Fluid Pressure Sensor/Switch C Circuit Intermittent
C212D Singer 8 Internal ECM Malfunction
C212D Volkswagen K70 Right Front Vertical Accelerometer Circuit Failure
C212D Chevrolet Sail EIC Switch-2 Assembly Circuit Short To Battery