C3806 Diagnostic Trouble Code

C3806 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 C3806 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
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
Dirty air cleaner element Damaged DPF

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. 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 C3806 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 C3806.

Fortunately, C3806 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3806 Trouble Code For Specific Cars

C3806 Playboy Convertible Evaporative Emission Control System Control Valve
C3806 Vaillante Grand Defi Power Window LR Motor Circuit Short To Battery
C3806 Renault Express Generator Control Circuit Malfunction
C3806 Dodge Dynasty Ignition Coil Primary/Secondary Circuit Malfunction
C3806 Nissan 260 Chime Input Request Circuit Short To Battery
C3806 Jensen Cv8 Seat Driver Recline Forward Switch Circuit Open
C3806 Mercedes-benz Cls Class Air Suspension Compressor Relay Circuit Open