C3819 Diagnostic Trouble Code

C3819 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 C3819 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
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.
Faulty IMRC actuator/sensor

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code C3819 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 C3819.

Fortunately, C3819 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3819 Trouble Code For Specific Cars

C3819 Hindustan Motors Ambassador PCM Processor Fault
C3819 Opel Agila Damper RF Circuit Short To Battery
C3819 Humber 16 Right Rear Backup Lamp Circuit Failure
C3819 Rover Vitesse Ignition Key-In Circuit Open
C3819 Toyota Vanguard Passenger Power Window Motor Circuit Short To Ground
C3819 Nissan President Crankshaft Position (CKP)/Ignition Coil - Cylinder 4 - Early Activation Fault
C3819 Iso Grifo SCP (J1850) Invalid or Missing Data for Primary Id / Vehicle Speed