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P2039 Dodge Code - Reductant Injection Air Pressure Sensor 'A' Circuit Low

Quick Answer

The P2039 diagnostic trouble code for Dodge vehicles indicates a problem with the Reductant Injection Air Pressure Sensor 'A' Circuit being too low. Common causes include Faulty Air Pressure Sensor: The sensor itself may be malfunctioning and providing incorrect readings to the PCM, Wiring Issues: Damaged or corroded wiring connections between the sensor and PCM can cause communication errors, DEF Contamination: Contaminated or low-quality DEF can cause issues with the reductant injection system. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means
P2039 Dodge indicates Reductant Injection Air Pressure Sensor 'A' Circuit Low.
Common causes
Common causes include Faulty Air Pressure Sensor: The sensor itself may be malfunctioning and providing incorrect readings to the PCM, Wiring Issues: Damaged or corroded wiring connections between the sensor and PCM can cause communication errors, DEF Contamination: Contaminated or low-quality DEF can cause issues with the reductant injection system.
Severity
Low - monitor the vehicle and repair when practical.
Can I drive?
The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2039 Dodge Description

The P2039 diagnostic trouble code for Dodge vehicles indicates a problem with the Reductant Injection Air Pressure Sensor 'A' Circuit being too low. In modern diesel vehicles, the reductant injection system is responsible for injecting a precise amount of urea solution (also known as diesel exhaust fluid or DEF) into the exhaust stream to reduce harmful nitrogen oxide emissions. The air pressure sensor in this system monitors the pressure of the air entering the reductant injection system to ensure proper operation.

OBDII Code P2039 Dodge - Reductant Injection Air Pressure Sensor 'A' Circuit Low
P2039 Dodge Code - Reductant Injection Air Pressure Sensor 'A' Circuit Low

Common Causes of P2039 Dodge

  1. Faulty Air Pressure Sensor: The sensor itself may be malfunctioning and providing incorrect readings to the PCM.
  2. Wiring Issues: Damaged or corroded wiring connections between the sensor and PCM can cause communication errors.
  3. DEF Contamination: Contaminated or low-quality DEF can cause issues with the reductant injection system.
  4. Exhaust System Leaks: Leaks in the exhaust system can disrupt the flow of air and affect sensor readings.
  5. PCM Malfunction: A faulty PCM can also be a potential cause for the P2039 code.

Symptoms of P2039 Dodge

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or reduced acceleration due to improper reductant injection.
  3. Poor Fuel Economy: A decrease in fuel efficiency may be noticed as the engine compensates for the faulty air pressure sensor readings.
  4. Increased Emissions: The vehicle may produce higher levels of harmful emissions due to the improper functioning of the reductant injection system.

How to Fix P2039 Dodge

  1. Diagnose the Issue: Use a scan tool to read the code and perform a thorough inspection of the reductant injection system to identify the root cause.
  2. Replace Air Pressure Sensor: If the sensor is found to be faulty, replace it with a new one following manufacturer guidelines.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as necessary.
  4. Test DEF Quality: Ensure that the DEF being used is of high quality and not contaminated.
  5. Clear Codes and Test Drive: Clear the code from the PCM memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2039 Dodge

The cost of repairing a P2039 code for a Dodge vehicle can vary depending on the specific cause of the issue and the labor rates in your area. In general, replacing the air pressure sensor can cost anywhere from $100 to $300, including parts and labor. Additional costs may be incurred if wiring repairs or other components need to be replaced. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's make and model. Keep in mind that diagnostic time and labor rates can also impact the final repair cost.

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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.

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