C1983 Diagnostic Trouble Code

C1983 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 C1983 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.
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 :

A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Faulty IMRC actuator/sensor
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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. 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.

Process Tips

Diagnostic trouble code C1983 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 C1983.

Fortunately, C1983 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1983 Trouble Code For Specific Cars

C1983 Proton Tiara Fuel Tank Temperature Sensor Circuit Malfunction
C1983 Toyota Celsior O2 Sensor Circuit Malfunction (Bank 2 Sensor 1)
C1983 Bmw 528 Chime Input Request Circuit Short To Ground
C1983 Ferrari 430 Intake Air Volume Circuit Malfunction
C1983 Austin Mini Aux A/C Blower Speed 1 Circuit Failure
C1983 Apollo B Air Suspension LF Height Sensor Circuit Short To Battery
C1983 Volvo S70 SCP (J1850) Invalid or Missing Data for Experimental #2