C0177 Diagnostic Trouble Code

C0177 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 C0177 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Malfunction Indicator Lamp (MIL) illuminated

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
Dirty air cleaner element Damaged DPF

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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 C0177 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 C0177.

Fortunately, C0177 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0177 Trouble Code For Specific Cars

C0177 Ferrari Mondial IPR Circuit Failure
C0177 Hyundai Azera SAI System Incorrect Downstream Flow Detected
C0177 Kia Ceed Seat Recline Forward/Backward Potentiometer Feedback Circuit Short To Battery
C0177 Ford Equator Mass or Volume Air flow Circuit Malfunction
C0177 Chevrolet Beretta Driver Mirror Power Driver Circuit Short Ground
C0177 Chevrolet Diplomata Driver's Door Unlock Relay Circuit Failure
C0177 Mitsubishi Jeep Autolamp Sensor Input Circuit Failure