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P20E8 2014 GMC Sierra Code - Reductant Low Pressure

Quick Answer

The P20E8 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the Reductant Low Pressure system. Common causes include Low AdBlue fluid level, Faulty Reductant Pressure Sensor, Clogged Reductant Injector. 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
P20E8 2014 GMC Sierra indicates Reductant Low Pressure.
Common causes
Common causes include Low AdBlue fluid level, Faulty Reductant Pressure Sensor, Clogged Reductant Injector.
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 17, 2024
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Code P20E8 2014 GMC Sierra Description

The P20E8 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates an issue with the Reductant Low Pressure system. In vehicles equipped with Selective Catalytic Reduction (SCR) technology, such as this GMC Sierra, the Reductant system is responsible for injecting a urea-based solution (AdBlue) into the exhaust stream to reduce harmful emissions. The Reductant Low Pressure code suggests that there is a problem with the pressure in the system, which can lead to inadequate injection of the urea solution, resulting in increased emissions and potential damage to the catalytic converter.

OBDII Code P20E8 2014 GMC Sierra - Reductant Low Pressure
P20E8 2014 GMC Sierra Code - Reductant Low Pressure

Common Causes of P20E8 2014 GMC Sierra

  1. Low AdBlue fluid level
  2. Faulty Reductant Pressure Sensor
  3. Clogged Reductant Injector
  4. Wiring or electrical issues
  5. Faulty Reductant Pump

Symptoms of P20E8 2014 GMC Sierra

  1. Check engine light illuminated
  2. Reduced engine power
  3. Poor fuel efficiency
  4. Increased emissions
  5. Difficulty starting the vehicle

How to Fix P20E8 2014 GMC Sierra

  1. Check the AdBlue fluid level and refill if low.
  2. Inspect the Reductant Pressure Sensor for any damage or malfunction and replace if necessary.
  3. Clean or replace the Reductant Injector if clogged.
  4. Inspect the wiring and connections related to the Reductant system for any faults and repair as needed.
  5. Test the Reductant Pump for proper operation and replace if faulty.

Cost to Fix P20E8 2014 GMC Sierra

The cost of repairing a Reductant Low Pressure issue can vary depending on the specific cause of the problem. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could fall between $200 and $800. It is important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the extent of the repairs needed. Additionally, diagnostic time and labor rates at auto repair shops can influence the final cost. It is recommended to obtain quotes from local shops for a more accurate estimate.

What does this mean?

Tech Notes for P20E8 2014 GMC Sierra









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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 P20E8 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P20E8 (Reductant Low Pressure) in a 2014 GMC Sierra?

The common symptoms of P20E8 may include the illumination of the Check Engine Light (CEL), reduced engine power, and potential exhaust emission issues.

2. What are the possible causes of OBDII code P20E8 in a 2014 GMC Sierra?

Possible causes of P20E8 include a faulty reductant pressure sensor, issues with the reductant pump, a clogged reductant tank, or a malfunctioning reductant injector.

3. How serious is OBDII code P20E8 in a 2014 GMC Sierra?

While P20E8 may not cause immediate drivability issues, it can lead to increased emissions and potential long-term engine problems if left unresolved. It is advisable to address this code promptly.

4. Can I continue driving my 2014 GMC Sierra with OBDII code P20E8 (Reductant Low Pressure)?

It is generally not recommended to drive the vehicle with an active P20E8 code, as it may lead to decreased engine performance and increased emissions. It is best to address the issue as soon as possible.

5. How can I diagnose OBDII code P20E8 in my 2014 GMC Sierra?

Diagnosing P20E8 typically involves using a diagnostic scanner to read the code, checking the reductant system components for any visible damage or leaks, and testing the reductant pressure sensor and pump for proper functionality.

6. What are some repair tips for fixing OBDII code P20E8 in a 2014 GMC Sierra?

Repair tips for P20E8 may include inspecting and cleaning the reductant tank, replacing a faulty reductant pressure sensor or pump, clearing any blockages in the reductant system, and ensuring proper reductant fluid levels.

7. Can a DIY enthusiast fix OBDII code P20E8 in a 2014 GMC Sierra?

While some aspects of addressing P20E8 may be tackled by experienced DIY enthusiasts, diagnosing and repairing reductant system issues may require specialized tools and expertise. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. How much does it cost to repair OBDII code P20E8 in a 2014 GMC Sierra?

The cost of repairing P20E8 can vary depending on the underlying cause of the code, replacement parts needed, and labor costs. It is advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

9. Are there any recalls or technical service bulletins related to OBDII code P20E8 in a 2014 GMC Sierra?

It is recommended to check with GMC or authorized service centers for any recalls or technical service bulletins related to P20E8 in your specific vehicle model year to see if there are any related issues addressed by the manufacturer.

10. How can I prevent OBDII code P20E8 from recurring in my 2014 GMC Sierra?

To prevent the recurrence of P20E8, it is essential to maintain regular servicing of the reductant system components, use high-quality reductant fluid, and address any related warning signs promptly to ensure optimal performance and emissions compliance.

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