C0846 Diagnostic Trouble Code

C0846 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 C0846 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
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code C0846 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 C0846.

Fortunately, C0846 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0846 Trouble Code For Specific Cars

C0846 Peugeot 806 Electric Current Circuit Malfunction
C0846 Citroen C Front Lateral Accelerometer Circuit Failure
C0846 Holden Hb Power Door Memory Lock Relay Circuit Failure
C0846 Mercedes Cl 55 ABS Inlet Valve Coil RF Circuit Open
C0846 Daihatsu Feroza Gear Shift Position Control Error
C0846 Triumph Daytona Passenger's Seat Recline Back Switch Circuit Short to Battery
C0846 Zundapp Janus Seat Belt Switch Circuit Short To Ground