C3845 Diagnostic Trouble Code

C3845 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 C3845 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C3845 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 C3845.

Fortunately, C3845 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3845 Trouble Code For Specific Cars

C3845 Kia Venga Servo Motor Coolair Bypass Circuit Failure
C3845 Rolls-royce 20 Hydraulic Pressure Unit Cycling Period Too Short
C3845 Ferrari 410 Intake Air Temperature Sensor 2 Circuit Low
C3845 Ferrari F430 Spider Internal Control Module ROM Error (Module Identification Defined by SAE J1979)
C3845 Lada 1600 Shift Solenoid A Control Circuit High
C3845 Volkswagen 181 Rear Echo Sensor Circuit Failure
C3845 Daewoo Chairman Fuel Volume Regulator Control Circuit Low