C0345 Diagnostic Trouble Code

C0345 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 C0345 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
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.
Defective ECU strategies or components will prevent proper regeneration

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C0345 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 C0345.

Fortunately, C0345 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0345 Trouble Code For Specific Cars

C0345 Geely Bo O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
C0345 Ferrari 288 Input-shaft-speed input circuit failure
C0345 Auto-union Dkw Aux Heater Fuel Pump Circuit Short to Ground
C0345 Maserati Royale Transmission Fluid Temperature Sensor Circuit Range/Performance
C0345 Rover 2300 Ignition Coil - Cylinder 1 - Early Activation Fault
C0345 Ferrari F355 Intermediate Speed Sensor (ISS) Malfunction
C0345 Fisker Tramonto Left Rear Center Sensor Circuit Short to Vbat