C0800 Diagnostic Trouble Code

C0800 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 C0800 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
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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.

Process Tips

Diagnostic trouble code C0800 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 C0800.

Fortunately, C0800 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0800 Trouble Code For Specific Cars

C0800 Lamborghini Lm Slip Solenoid System
C0800 Nissan 350z CID High
C0800 Dodge Durango Ignition Coil Primary Circuit Failure
C0800 Vignale 125 PWM Input Circuit Failure
C0800 Suminoe Flying MAF Sensor In Range But Lower Than Expected
C0800 Lagonda 11.9 Shift Solenoid C Stuck On
C0800 Venturi 400 Pump Rotor Control Underfueling