C0143 Diagnostic Trouble Code

C0143 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 C0143 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
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

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Some aftermarket accessories and performance modifications

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. Now, clear the codes and test-drive the vehicle to see if the code is reset.

Process Tips

Diagnostic trouble code C0143 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 C0143.

Fortunately, C0143 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0143 Trouble Code For Specific Cars

C0143 Mercedes-benz Slk Class Air Suspension Front Inflator Solenoid Output Circuit Short To Battery
C0143 Chevrolet Silverado EIC Switch-2 Assembly Circuit Short To Ground
C0143 Geely Merrie Octane Adjust Pin Out Of Self Test Range
C0143 Abarth 1600
C0143 Skoda 110 IPR Circuit Failure
C0143 Singer 9 Internal Voltage Regulator Malfunction
C0143 Opel Ampera-e Damper RR Circuit Open