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U111E Chevrolet Code - Lost Communication with EVAP Purge Pump

Quick Answer

The U111E diagnostic trouble code for Chevrolet vehicles indicates that there is a communication problem with the EVAP (Evaporative Emission Control System) purge pump. Common causes include Faulty EVAP purge pump, Wiring or connector issues, ECM communication error. 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 Chevrolet indicates Lost Communication with EVAP Purge Pump.
Common causes
Common causes include Faulty EVAP purge pump, Wiring or connector issues, ECM communication error.
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 07, 2024
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Code U111E Chevrolet Description

The U111E diagnostic trouble code for Chevrolet vehicles indicates that there is a communication problem with the EVAP (Evaporative Emission Control System) purge pump. The EVAP system is responsible for capturing and storing fuel vapors to prevent them from escaping into the atmosphere. The purge pump is a component of the EVAP system that helps to control the flow of fuel vapors from the charcoal canister to the engine for combustion.

OBDII Code U111E Chevrolet - Lost Communication with EVAP Purge Pump
U111E Chevrolet Code - Lost Communication with EVAP Purge Pump

Common Causes of U111E Chevrolet

  1. Faulty EVAP purge pump
  2. Wiring or connector issues
  3. ECM communication error
  4. EVAP system leaks
  5. Vacuum hose leaks

Symptoms of U111E Chevrolet

  1. Check Engine Light illuminated
  2. Decreased fuel efficiency
  3. Rough idling or engine stalling
  4. Failed emissions test
  5. Strong fuel odor

How to Fix U111E Chevrolet

  1. Begin by performing a visual inspection of the EVAP purge pump, wiring, and connectors to check for any visible damage or loose connections.
  2. Use a scan tool to retrieve and clear the U111E trouble code from the ECM memory.
  3. Test the EVAP purge pump with a multimeter to ensure it is functioning correctly.
  4. Inspect the EVAP system for any leaks or damaged components that could be affecting the purge pump's operation.
  5. Replace the EVAP purge pump if necessary, and reset the ECM to clear the code and monitor the system for proper operation.

Cost to Fix U111E Chevrolet

The cost of repairing a lost communication with the EVAP purge pump can vary depending on the extent of the issue and the cost of parts and labor. On average, the repair cost for this type of problem ranges from $150 to $400, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary significantly, so it is advisable to check with local shops for a more accurate estimate based on your specific vehicle make and model.

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Information for Specific Chevrolet Models

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 Chevrolet Code

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

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

2. What are some possible causes of the U111E code indicating lost communication with the EVAP purge pump in a Chevrolet?

- Possible causes may include a faulty EVAP purge pump, damaged wiring or connectors, a blown fuse related to the EVAP system, or issues with the vehicle's onboard diagnostic system.

3. How can I diagnose the U111E code in a Chevrolet related to lost communication with the EVAP purge pump?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the EVAP purge pump for proper functionality, inspecting the wiring and connectors for damage, and ensuring the relevant fuses are intact.

4. Is it safe to continue driving my Chevrolet with the U111E code indicating lost communication with the EVAP purge pump?

- It is generally not recommended to drive the vehicle for an extended period with this code present, as it can lead to potential issues with emissions compliance and overall engine performance.

5. What are some repair tips for addressing the U111E code in a Chevrolet related to lost communication with the EVAP purge pump?

- Repair tips may include replacing the EVAP purge pump if it is found to be faulty, repairing or replacing damaged wiring and connectors, and checking and replacing any blown fuses as needed.

6. Can I reset the U111E code indicating lost communication with the EVAP purge pump in a Chevrolet using an OBDII scanner?

- Yes, you can typically reset the code using an OBDII scanner after addressing the underlying issue. However, if the problem persists, the code may reappear.

7. How serious is the U111E code related to lost communication with the EVAP purge pump in a Chevrolet?

- While the code itself may not pose an immediate danger, it is important to address it promptly to prevent potential issues with emissions compliance and overall vehicle performance.

8. Are there any DIY steps I can take to troubleshoot the U111E code in my Chevrolet before seeking professional help?

- DIY steps may include checking for loose or damaged wiring, ensuring the EVAP purge pump is functioning properly, and inspecting relevant fuses before considering professional assistance.

9. Can weather conditions or driving habits contribute to the occurrence of the U111E code in a Chevrolet indicating lost communication with the EVAP purge pump?

- Extreme weather conditions, rough driving habits, or other external factors may indirectly contribute to issues that trigger the U111E code, making regular maintenance and care important.

10. How much does it typically cost to repair the U111E code related to lost communication with the EVAP purge pump in a Chevrolet?

- The cost of repairs can vary depending on the specific underlying issue, parts needed for replacement, labor costs, and whether the repair is done at a dealership or an independent mechanic. It's advisable to get estimates from different sources before proceeding with repairs.

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