C0774 Diagnostic Trouble Code

C0774 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 C0774 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. 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 C0774 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 C0774.

Fortunately, C0774 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0774 Trouble Code For Specific Cars

C0774 Lamborghini Jarama Signal Link Short to Ground (Non SCP) / From NGV Module
C0774 Toyota 105 Multiple Gears Engaged
C0774 Mazda 929 Transmission Transfer Case Contact Plate Power Circuit Failure
C0774 Chevrolet Corsa Driver Side Crash Sensor Communication Fault (Non SCP)
C0774 Daimler 4.5-litre Hazard Flash Output Circuit Short To Ground
C0774 Mazda R
C0774 Pininfarina Osee EV Battery Pack Temperature Fault