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 Chiribiri Chiribiri Engine Coolant Temperature Signal Missing/Fault
P0177 Toyota Blizzard O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0177 Lexus Is200 TCM Power Relay Control Circuit Low
P0177 Locomobile 30 Timing Reference High Resolution Signal A Intermittent/Erratic Pulses
P0177 Volkswagen Santana Running Board Lamp Circuit Short to Battery
P0177 Ford Ecosport Mass or Volume Air flow Circuit High Input
P0177 Alfa Romeo 166 ABS Power Relay Coil Short Circuit To Battery