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Engine-Codes – Generic – P2059

P2059 Code - Reductant Injection Air Pump Control Circuit/Open

Quick Answer

The P2059 diagnostic trouble code indicates a problem with the reductant injection air pump control circuit on a vehicle. Common causes include Faulty reductant injection air pump control module, Damaged wiring or connectors in the control circuit, Blown fuse related to the reductant injection air pump. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2059 indicates Reductant Injection Air Pump Control Circuit/Open.
Common causes
Common causes include Faulty reductant injection air pump control module, Damaged wiring or connectors in the control circuit, Blown fuse related to the reductant injection air pump.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P2059 Description

The P2059 diagnostic trouble code indicates a problem with the reductant injection air pump control circuit on a vehicle. The reductant injection air pump is a crucial component of the vehicle's emissions control system, specifically in vehicles equipped with a diesel engine and a selective catalytic reduction (SCR) system. The purpose of the reductant injection air pump is to supply air to the reductant injector to help reduce harmful emissions by converting nitrogen oxides (NOx) into nitrogen and water vapor.

OBDII Code P2059 - Reductant Injection Air Pump Control Circuit/Open
P2059 Code - Reductant Injection Air Pump Control Circuit/Open

Common Causes of P2059

  1. Faulty reductant injection air pump control module
  2. Damaged wiring or connectors in the control circuit
  3. Blown fuse related to the reductant injection air pump
  4. Corrosion or moisture in the circuit causing poor connections
  5. Issues with the PCM or other related control modules

Symptoms of P2059

  1. Check Engine Light: The most common symptom associated with the P2059 code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning reductant injection air pump control circuit can lead to decreased fuel efficiency as the engine may not be running at optimal levels.
  3. Increased Emissions: The vehicle may produce higher emissions than usual due to the improper functioning of the emissions control system.
  4. Limp Mode: In some cases, the vehicle may go into a reduced power or limp mode to prevent further damage to the engine.

How to Fix P2059

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific fault code and pinpoint the exact cause of the problem.
  2. Inspect Wiring and Connectors: Check the wiring and connectors related to the reductant injection air pump control circuit for any signs of damage or corrosion. Repair or replace as needed.
  3. Test the Pump: Test the reductant injection air pump to ensure it is functioning properly. Replace if necessary.
  4. Check Fuses: Inspect the fuses related to the reductant injection air pump circuit and replace any blown fuses.
  5. Clear Codes and Test Drive: Clear the fault codes from the PCM, then test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2059

The typical repair costs for addressing a P2059 code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the cost of replacing a faulty reductant injection air pump control module can range from $200 to $500, including parts and labor. However, additional costs may be incurred if other components need to be replaced or if further diagnosis is required. It's important to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more precise estimate.

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Code P2059 Information for Specific Makes

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 P2059 Code

1. What are common symptoms of OBDII code P2059 (Reductant Injection Air Pump Control Circuit/Open)?

Common symptoms include the check engine light illuminating, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code P2059?

Possible causes include a faulty reductant injection air pump, damaged wiring or connectors in the control circuit, or a problem with the powertrain control module (PCM).

3. How can I diagnose the cause of OBDII code P2059?

Diagnosis typically involves using a scan tool to retrieve the code, inspecting the reductant injection air pump and its components, checking the wiring and connectors for damage, and testing the control circuit for proper function.

4. Can I still drive my vehicle with OBDII code P2059?

It is not recommended to drive your vehicle with this code present, as it can lead to decreased engine performance and potential emissions issues. It's best to address the problem as soon as possible.

5. How can I repair OBDII code P2059?

Repair options may include replacing the reductant injection air pump, repairing or replacing damaged wiring or connectors, or addressing any issues with the PCM. It's advisable to consult a professional mechanic for proper diagnosis and repair.

6. Is OBDII code P2059 a serious issue?

While it may not cause immediate harm to your vehicle, ignoring this code can lead to more significant problems over time, such as failing emissions tests or reduced engine efficiency. It's best to address the issue promptly.

7. Can a DIY enthusiast fix OBDII code P2059 at home?

Depending on your skill level and access to tools, you may be able to address this code at home. However, due to the complexity of the emissions system and electrical components involved, it's recommended to seek professional help for an accurate diagnosis and repair.

8. Will resetting the OBDII code P2059 make it go away permanently?

Simply clearing the code without addressing the underlying issue will not fix the problem permanently. The code is likely to reappear until the root cause is identified and repaired.

9. How much does it typically cost to repair OBDII code P2059?

Repair costs can vary depending on the specific cause of the code, the extent of the damage, and labor rates in your area. It's best to get a diagnostic from a mechanic to determine the exact cost of repairs.

10. Can OBDII code P2059 cause damage to other vehicle components if left unresolved?

While the immediate risk may be minimal, ongoing issues with the reductant injection air pump or related components can potentially lead to damage to other parts of the emissions system or affect overall engine performance if not addressed in a timely manner.

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