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Engine-Codes – GMC – U111E 2020 GMC Sierra

U111E 2020 GMC Sierra Code - Lost Communication with EVAP Purge Pump

Quick Answer

The U111E code for a 2020 GMC Sierra indicates that there is a communication error between the vehicle's engine control module (ECM) and the evaporative emission (EVAP) purge pump. Common causes include Faulty wiring connections, Malfunctioning EVAP purge pump, Damaged ECM. 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
U111E 2020 GMC Sierra indicates Lost Communication with EVAP Purge Pump.
Common causes
Common causes include Faulty wiring connections, Malfunctioning EVAP purge pump, Damaged ECM.
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 13, 2024
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Code U111E 2020 GMC Sierra Description

The U111E code for a 2020 GMC Sierra indicates that there is a communication error between the vehicle's engine control module (ECM) and the evaporative emission (EVAP) purge pump. The EVAP system is responsible for capturing and storing fuel vapors to prevent them from being released into the atmosphere. The purge pump is a crucial component of this system as it helps to control the flow of fuel vapors from the charcoal canister to the engine for combustion.

OBDII Code U111E 2020 GMC Sierra - Lost Communication with EVAP Purge Pump
U111E 2020 GMC Sierra Code - Lost Communication with EVAP Purge Pump

Common Causes of U111E 2020 GMC Sierra

  1. Faulty wiring connections
  2. Malfunctioning EVAP purge pump
  3. Damaged ECM
  4. Communication error within the vehicle's network system

Symptoms of U111E 2020 GMC Sierra

  1. Check engine light illuminated
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Failed emissions test

How to Fix U111E 2020 GMC Sierra

  1. Begin by conducting a thorough inspection of the wiring connections between the ECM and the EVAP purge pump. Repair or replace any damaged wires.
  2. Test the EVAP purge pump to ensure it is functioning correctly. Replace the purge pump if necessary.
  3. Check the ECM for any signs of damage or malfunction. Repair or replace the ECM as needed.
  4. Clear the diagnostic trouble codes from the vehicle's memory using a scan tool.
  5. Perform a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix U111E 2020 GMC Sierra

The typical repair costs for addressing a U111E code on a 2020 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair could range from $100 to $300, while labor costs may range from $100 to $200. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 U111E 2020 GMC Sierra Code

1. What are the common symptoms of OBDII code U111E in a 2020 GMC Sierra related to lost communication with the EVAP purge pump?

- Common symptoms include the check engine light illuminating, rough idling, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code U111E indicating lost communication with the EVAP purge pump in a 2020 GMC Sierra?

- Potential causes can include a faulty EVAP purge pump, damaged wiring or connectors, a failed EVAP system control module, or a communication error within the vehicle's network.

3. How can I diagnose and troubleshoot OBDII code U111E in a 2020 GMC Sierra related to lost communication with the EVAP purge pump?

- Diagnosing this code typically involves checking the EVAP purge pump for proper operation, inspecting wiring and connectors for damage, scanning the vehicle's network for communication issues, and testing the EVAP system control module.

4. Is it safe to continue driving a 2020 GMC Sierra with OBDII code U111E indicating lost communication with the EVAP purge pump?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to potential emissions issues and affect the vehicle's performance. It is best to address the problem promptly.

5. Can I repair OBDII code U111E in a 2020 GMC Sierra related to lost communication with the EVAP purge pump myself?

- Depending on your experience and tools, you may be able to address this issue yourself by checking and repairing wiring connections, replacing the EVAP purge pump if necessary, or resetting the vehicle's computer after fixing the problem.

6. How much does it typically cost to repair OBDII code U111E in a 2020 GMC Sierra caused by lost communication with the EVAP purge pump?

- The cost of repair can vary depending on the exact cause of the issue. It may range from a simple fix like reconnecting a loose wire to replacing the EVAP purge pump or control module. Costs can range from a few dollars for parts to a few hundred dollars for more extensive repairs.

7. Will resetting the OBDII code U111E in a 2020 GMC Sierra related to lost communication with the EVAP purge pump make it go away permanently?

- Resetting the code may clear the check engine light temporarily, but if the underlying issue causing the code is not addressed, the code is likely to reappear. It's essential to diagnose and fix the root cause of the problem to prevent recurring issues.

8. How long does it typically take to repair OBDII code U111E in a 2020 GMC Sierra due to lost communication with the EVAP purge pump?

- The repair time can vary depending on the exact cause of the code and the complexity of the fix. Simple issues like a loose connector can be resolved quickly, while more involved repairs may take several hours or longer if parts need to be ordered.

9. Can OBDII code U111E in a 2020 GMC Sierra related to lost communication with the EVAP purge pump cause any long-term damage to the vehicle?

- Ignoring this code can potentially lead to emissions system failures or affect the vehicle's overall performance. It is important to address the issue promptly to prevent any long-term damage to the vehicle.

10. Are there any preventive maintenance tips to avoid encountering OBDII code U111E in a 2020 GMC Sierra due to lost communication with the EVAP purge pump?

- Regularly inspecting the EVAP system components for signs of wear or damage, ensuring proper wiring connections, and addressing any check engine light warnings promptly can help prevent issues that may trigger this code.

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