Engine-Codes - Generic - P2039

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

- Code Popularity: 12,442 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P2039?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Reductant Injection Air Pressure Sensor
  • Reductant Injection Air Pressure Sensor harness is open or shorted
  • Reductant Injection Air Pressure Sensor circuit poor electrical connection
  • Faulty Reductant Pump Assembly
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How to Fix the DTC P2039?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P2039 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P2039 Code Mean?

The reductant system uses a selective reduction catalyst to improve exhaust emissions and fuel efficiency by injecting a reductant into the exhaust system. The reductant also referred to as diesel exhaust fluid is a 32.5% solution of urea in deionized water. The reductant system reduces Nitrogen Oxides (NOx) present in the exhaust stream to nitrogen and water.
The Reductant Injection Air Pressure Sensor sends voltage reading information to the Powertrain Control Module (PCM). The PCM interprets these readings as pressure or exhaust gas temperature. The code is set when the voltage sent from the sensor to the PCM is out of factory specifications.

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

Need more Information on the Code?

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Code P2039 Information for Specific Makes

  • P2039 Chevrolet Reductant Injection Air Pressure Sensor 'A' Circuit Low
  • P2039 Dodge Reductant Injection Air Pressure Sensor 'A' Circuit Low
  • P2039 Ford Reductant Injection Air Pressure Sensor 'A' Circuit Low
  • P2039 GMC Reductant Injection Air Pressure Sensor 'A' Circuit Low
  • P2039 Mercedes-Benz Reductant Injection Air Pressure Sensor 'A' Circuit Low

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