Error Code P0479: What It Means & What To Do?

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“Halt” they cried! Hate halts like we do? Wanting to combat this OBD Error Code P0479? Here’s an easy guide to keep you on a roll. This is a generic trouble diagnostic code stored by the PCM when there is a detection of an exceptionally unusual (high or low) voltage reading from the Exhaust Pressure Control Valve Circuit. The Error Code P0479 is particularly observed in the diesel and turbocharged gasoline engines, where the exhaust pressure is typically recorded.

In the turbocharged gasoline and diesel engines, the exhaust back pressure valve is in charge of controlling the exhaust pressure. From the data assembled from the throttle position sensor, tachometer and the other sensors the PCM evaluates and determines the desired exhaust back pressure which is also based according to the manufacturer’s recommendations. So consequently, if the variable resistance circuit that is in charge to supply data regarding the exhaust back pressure valve voltage records a voltage that is higher or lower than the desired pressure, the PCM stores the OBD-II generic code P0479.

What causes this problem with the Exhaust Pressure Control Valve "A" Intermittent

• Defective or corroded electrical wiring.
• Inoperative connectors.
• Open or disconnected circuits between the exhaust pressure sensor and the PCM.
• Overboost on a turbocharger.
• A damaged PCM (rarely happens).

1. Exhaust Pressure Sensor - Common causes leading to an Error Code P0479 could also root because of a damaged Exhaust Pressure Sensor. So why not get it changed? We at Parts Avatar guarantee our customers not only superior quality products but also price-worthy services. Tune in now.
2. Powertrain Control Module - Abbreviated PCM; this automotive part installed is an integral unit. So a distorted be should be changed immediately in order to overcome further complications caused by the Error Code P0479.
3. Malfunction Indicator Lamp (MIL) - Halt in your journey? Possible reasons behind it could also include an error in the Malfunction Indicator Lamp. A fault in the MIL could also lead to a more problematizing Error Code P0479. So get yours changed now.

Just can’t figure out how to go about the Error Code P0479? Don’t worry! You have just landed at the right place. We at Parts Avatar have listed a few symptoms that will help you diagnose the Error Code P0479

• The Malfunction Indicator Lamp light appearing on.
• Insufficient power
• Deficient Engine Brakes.
• Longer duration of time taken by cold engine to warm up.

Wishing to fight back the Error Code P0479? Here listed are a few steps that need to be followed to avoid or overcome the OBD Error Code P0479 –

• All the wires and connectors should be visually inspected and testified, and the ones come out to be damaged should be changed instantly.
• The code should be cleared from the PCM and thereafter the vehicle should be taken for a test drive to check if the Engine light returns.
• The back pressure to voltage conversion data should also be acquired as well as the back-pressure system schematics for the vehicle make and model. The back-pressure voltage using a digital volt/ohmmeter should be checked manually and the recordings should be compared to the manufacturer’s specifications.
• A thorough cleansing an mending of the exhaust back pressure tube and the sensor should be performed.
• Restore and repair any other shortened or faulty wiring or connectors in all circuits.
• The solenoid if required should be changed.

Here’s how you can easily diagnose the complicated Error Code P0479 with Parts Avatar-

Using an OBD-II Scanner, if the technician detects an Error Code P0479, a visual inspection should be performed of all the electrical wiring, connectors and other components of the Exhaust Pressure control system. Now, after that all the amendments have been made and the code has been cleared, it is advised that the technician should take the vehicle again for a test drive and observe whether the check engine light appears on again. If the Engine light does appear, the technician should further begin with repairing the other parts.

Common Mistakes When Diagnosing the P0479 Code

Terrorized by the constant reappearance of the Error Code P0479? Possibly, it could be due to a misdiagnosis. Parts Avatar, for the convenience our customers have listed a few commonly committed mistakes -

While diagnosing it is really common to confuse the code P0479 with Exhaust Gas Recirculation because of the close proximity in the location of the two valves. So the code should therefore be diagnosed and repaired cautiously and differently keeping the peculiarities of both these code in mind.