P0177 Diagnostic Trouble Code

P0177 is a kind of OBD-II Diagnostic P-Powertrain 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 P0177 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Lack of power

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.
Some aftermarket accessories and performance modifications

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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 P0177 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 P0177.

Fortunately, P0177 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0177 Trouble Code For Specific Cars

P0177 Izh Oda Seat Direction Switch Assembly Circuit Short To Ground
P0177 Porsche Kremer Fuel Pump Secondary Circuit Low
P0177 Tata E 220 Mirror Passenger Up Circuit Short To Ground
P0177 Mercedes-benz 130 Air Bag Driver Circuit Short to Ground - Loop #2
P0177 Fiat Grande Punto Lamp Turn Signal Front Output Circuit Failure
P0177 Hudson Italia Right Front Center Sensor Circuit Fault
P0177 Porsche Cayenne Type 9pa