P1077 Diagnostic Trouble Code

P1077 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 P1077 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
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 vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly 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 P1077 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 P1077.

Fortunately, P1077 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1077 Trouble Code For Specific Cars

P1077 Ac Cobra ABS Function Enabled Input Circuit Failure
P1077 Emf 30 Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
P1077 Renault Manager Head Rest Switch Circuit Failure
P1077 Saturn Sl Incorrect Module Design Level
P1077 Ferrari Pinin Key Off Voltage High
P1077 Ducati Monster 821 Illuminated Entry Input Short Circuit To Ground
P1077 Holden Tg Power Window Master Circuit Short To Battery