C2394 Diagnostic Trouble Code

C2394 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 C2394 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
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
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. 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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code C2394 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 C2394.

Fortunately, C2394 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2394 Trouble Code For Specific Cars

C2394 Bitter Cd Brake Pedal Input Open Circuit
C2394 Trabant 601 Passenger Sid, Side mount Airbag Circuit Short to Ground
C2394 Lada Largus Shift Solenoid B Control Circuit Range/Performance
C2394 Italdesign Medici SCP (J1850) Lack of Acknowledgment for Mirrors
C2394 Ford M350 Mirror Driver Up/Down Motor Stalled
C2394 Mercedes-benz T Class Air Suspension Gate Solenoid Output Circuit Short To Battery
C2394 Mazda Premacy 3-2 Downshift Error