C0744 Diagnostic Trouble Code

C0744 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 C0744 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
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.
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

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.

Process Tips

Diagnostic trouble code C0744 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 C0744.

Fortunately, C0744 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0744 Trouble Code For Specific Cars

C0744 Holden Zafira Pressure Control Solenoid "C" Short Circuit
C0744 Lada Vaz Shift Solenoid C Electrical
C0744 Nissan Ideo Clutch Switch Input Circuit Malfunction
C0744 Moretti 1000 Battery Saver Relay Coil Circuit Failure
C0744 Bristol Beaufighter Crankshaft Position Sensor A Circuit Low Input
C0744 Toyota Runx Park Lamp Relay Coil Short to Battery
C0744 Lada Vesta Shift Solenoid C Malfunction