C3785 Diagnostic Trouble Code

C3785 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 C3785 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
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
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 C3785 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 C3785.

Fortunately, C3785 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3785 Trouble Code For Specific Cars

C3785 Chevrolet Rezzo EIC Switch-1 Assembly Circuit Short To Ground
C3785 Jaguar Kensington Seat Driver Forward Switch Circuit Short To Ground
C3785 Smart Crossblade Lamp Adaptive Damping Warning Circuit Failure
C3785 Mercedes C 280 ABS Inlet Valve Coil LR Circuit Failure
C3785 Seat Ateca Injector Circuit Open / Shorted - Cylinder #2
C3785 Talbot Lago Mirror Passenger Horizontal Switch Circuit Short To Battery
C3785 Alfa Romeo Rl Air Bag Crash Sensor #1 Ground Circuit Short To Battery