C3757 Diagnostic Trouble Code

C3757 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 C3757 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code C3757 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 C3757.

Fortunately, C3757 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3757 Trouble Code For Specific Cars

C3757 Kia Picanto Ii Seatbelt Passenger Pretensioner Circuit Resistance Low on Squib
C3757 Bugatti Type 13 Cylinder #7 High To Low Side Open
C3757 Buick Model 2x-4x Cylinder 9 Contribution/Balance Fault
C3757 Fiat 500x Lamp Anti-Theft Indicator Circuit Failure
C3757 Nissan Langley Cold Start Injector 2 Malfunction
C3757 Healey Westland Passengers Seat Belt Buckle Switch Circuit Short to Ground
C3757 Vanden Plas Princess Power Window Master Circuit Short To Battery