U0177 Diagnostic Trouble Code

U0177 is a kind of OBD-II Diagnostic U-Network 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 U0177 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 U0177 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 U0177.

Fortunately, U0177 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0177 Trouble Code For Specific Cars

U0177 Chevrolet Omega EGR Metering Orifice Restricted
U0177 Obvio! 828 Cylinder 2 Misfire Detected
U0177 Suzulight Van Mirror Driver Vertical Switch Circuit Short To Ground
U0177 Renault Alaskan Gear Select position short to Battery
U0177 Holden Torana Power Window Master Circuit Short To Ground
U0177 Berkeley Bandit Booster Solenoid circuit Failure
U0177 Peugeot 504 EIC Switch-2 Assembly Circuit Open