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P0479 Dodge Code - Exhaust Pressure Control Valve Intermittent

Quick Answer

The P0479 diagnostic trouble code (DTC) for Dodge vehicles refers to an issue with the Exhaust Pressure Control Valve (EPCV) that is intermittent. Common causes include Faulty Exhaust Pressure Control Valve: The most common cause of the P0479 code is a malfunctioning EPCV, which may be due to wear and tear or electrical issues, Wiring or Connection Issues: Corrosion, loose connections, or damaged wiring related to the EPCV can trigger this code, Exhaust System Blockage: Obstructions in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can disrupt the EPCV's operation. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0479 Dodge indicates Exhaust Pressure Control Valve Intermittent.
Common causes
Common causes include Faulty Exhaust Pressure Control Valve: The most common cause of the P0479 code is a malfunctioning EPCV, which may be due to wear and tear or electrical issues, Wiring or Connection Issues: Corrosion, loose connections, or damaged wiring related to the EPCV can trigger this code, Exhaust System Blockage: Obstructions in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can disrupt the EPCV's operation.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0479 Dodge Description

The P0479 diagnostic trouble code (DTC) for Dodge vehicles refers to an issue with the Exhaust Pressure Control Valve (EPCV) that is intermittent. The EPCV plays a crucial role in managing exhaust pressure in the vehicle's emission control system. When this valve fails intermittently, it can lead to a variety of performance issues and potential damage to other components in the exhaust system.

OBDII Code P0479 Dodge - Exhaust Pressure Control Valve Intermittent
P0479 Dodge Code - Exhaust Pressure Control Valve Intermittent

Common Causes of P0479 Dodge

  1. Faulty Exhaust Pressure Control Valve: The most common cause of the P0479 code is a malfunctioning EPCV, which may be due to wear and tear or electrical issues.
  2. Wiring or Connection Issues: Corrosion, loose connections, or damaged wiring related to the EPCV can trigger this code.
  3. Exhaust System Blockage: Obstructions in the exhaust system, such as a clogged catalytic converter or exhaust pipe, can disrupt the EPCV's operation.
  4. ECU Malfunction: A faulty Engine Control Unit (ECU) can send incorrect signals to the EPCV, leading to intermittent failures.
  5. Environmental Factors: Extreme temperatures, moisture, or road debris can impact the EPCV's performance and trigger the P0479 code.

Symptoms of P0479 Dodge

  1. Check Engine Light: The most common symptom associated with the P0479 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Engine Performance Issues: The vehicle may experience a decrease in engine performance, including reduced power, rough idling, or hesitation during acceleration.
  3. Increased Emissions: A faulty EPCV can lead to higher emissions output, which may fail emissions tests and contribute to environmental pollution.
  4. Reduced Fuel Efficiency: The engine may consume more fuel than usual due to improper exhaust pressure regulation by the EPCV.

How to Fix P0479 Dodge

  1. Diagnostic Testing: Begin by using a diagnostic scan tool to retrieve the specific fault codes, including P0479, and assess the EPCV's operation.
  2. Inspect EPCV and Wiring: Check the Exhaust Pressure Control Valve and its wiring for any visible damage, corrosion, or loose connections. Replace or repair as needed.
  3. Clear Fault Codes: After repairing the EPCV or wiring issues, clear the fault codes using the diagnostic tool and test drive the vehicle to ensure the problem is resolved.
  4. Monitor Performance: Keep an eye on the vehicle's engine performance, emissions output, and fuel efficiency to verify that the EPCV is functioning correctly after repairs.
  5. Professional Assistance: If you are unsure about diagnosing or repairing the EPCV issue, consider seeking help from a qualified mechanic or automotive technician to ensure proper resolution.

Cost to Fix P0479 Dodge

The cost of repairing the P0479 code for Dodge vehicles can vary depending on the extent of the issue, the specific components that need replacement, and labor rates in your area. On average, the parts for an Exhaust Pressure Control Valve replacement can range from $100 to $300, while labor costs may add an additional $100 to $200. Overall, the total repair cost for addressing the P0479 code could range from $200 to $500, including parts and labor.

What does this mean?

Tech Notes for P0479 Dodge

Check the Exhaust Back Pressure Valve (EBPV) butterfly valve is opening and closing freely and not sticking. If it seems to move freely you can then check the connector and circuit for the EBPV solenoid.

When is the Code Detected?

Problems with either the Exhaust Back Pressure (EBP) Device or the tube between the exhaust manifold and the EBP sensor can be detected during the exhaust back pressure step test, in which the Engine Control Module (ECM) commands and then measures a specific preprogrammed pressure and then measures time for pressure decay during the engine running test.

If the ECM detects an Exhaust Back Pressure (EBP), Engine Oil Temperature (EOT) or Intake Air Temperature (IAT) sensor fault it will disable the exhaust back pressure regulator.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0479 Dodge Code

1. What are common symptoms of OBDII code P0479 in a Dodge related to the Exhaust Pressure Control Valve Intermittent?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and potential black smoke coming from the exhaust.

2. What are the possible causes of OBDII code P0479 indicating an Exhaust Pressure Control Valve Intermittent issue in a Dodge?

- Possible causes include a faulty exhaust pressure control valve, wiring issues, a clogged exhaust system, or a malfunctioning exhaust gas recirculation (EGR) valve.

3. How can I diagnose the OBDII code P0479 in my Dodge related to the Exhaust Pressure Control Valve Intermittent?

- Diagnosis involves using an OBDII scanner to read the code, visually inspecting the exhaust pressure control valve and related components, and checking the wiring for any damage or corrosion.

4. What are some repair tips for addressing OBDII code P0479 in a Dodge indicating an Exhaust Pressure Control Valve Intermittent problem?

- Repair tips include cleaning or replacing the exhaust pressure control valve, checking and repairing any damaged wiring, clearing the code using an OBDII scanner, and conducting a test drive to ensure the issue is resolved.

5. Can driving with OBDII code P0479 related to the Exhaust Pressure Control Valve Intermittent in a Dodge cause further damage?

- Continuing to drive with this issue may result in reduced engine performance, decreased fuel efficiency, and potential damage to other engine components over time. It is recommended to address the problem promptly.

6. How much does it typically cost to repair OBDII code P0479 indicating an Exhaust Pressure Control Valve Intermittent issue in a Dodge?

- Repair costs can vary depending on the exact cause of the problem, but typically range from $100 to $500 for parts and labor at a professional repair shop.

7. Is it possible to reset the OBDII code P0479 related to the Exhaust Pressure Control Valve Intermittent in a Dodge without making any repairs?

- While you can clear the code using an OBDII scanner, it is not recommended to reset the code without addressing the underlying issue, as it may lead to continued problems and potential damage to the vehicle.

8. Can a DIY enthusiast with basic automotive skills repair OBDII code P0479 related to the Exhaust Pressure Control Valve Intermittent in a Dodge?

- Depending on the exact cause, DIY repair may be possible, such as cleaning or replacing the exhaust pressure control valve. However, more complex issues may require professional assistance.

9. How long does it typically take to repair OBDII code P0479 indicating an Exhaust Pressure Control Valve Intermittent problem in a Dodge?

- The repair time can vary based on the cause of the issue and the repair process involved, but it usually takes anywhere from 1 to 4 hours at a repair shop.

10. Are there any preventive measures to avoid OBDII code P0479 related to the Exhaust Pressure Control Valve Intermittent in a Dodge?

- Regular maintenance, including checking and cleaning the exhaust system components, inspecting wiring for damage, and using high-quality fuel, can help prevent issues leading to this OBDII code.

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