AutoCodes – GMC – U111E GMC

U111E GMC Code - Lost Communication with EVAP Purge Pump

Quick Answer

Purge capacity is being reduced by technologies that improve fuel economy. Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection. 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 GMC indicates Lost Communication with EVAP Purge Pump.
Common causes: Common causes include Faulty Evaporative Emission Purge Pump, Evaporative Emission Purge Pump harness is open or shorted, Evaporative Emission Purge Pump circuit poor electrical connection.
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.

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Code Popularity 418

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 18, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U111E GMC Description

Purge capacity is being reduced by technologies that improve fuel economy. The Evaporative Emission Purge Pump is used to purge stored vapors from the Evaporative Emission Canister and is required to increase the purge volumes to meet LEV 3 Evaporative Emission requirements. The Evaporative Emission Purge Pump has an integral pressure sensor for controlling purge vapors from the canister. The Engine Control Module (ECM) monitors the Evaporative Emission Purge Pump, the Diagnostic Trouble Code (DTC) will be set when the serial data message from Evaporative Emission Purge Pump is not received for greater than 1 s.

OBDII Code U111E GMC - Lost Communication with EVAP Purge Pump - AutoCodes.com — U111E GMC Code - Lost Communication with EVAP Purge Pump

What does this mean?

What are the Possible Causes of the DTC U111E GMC?

Faulty Evaporative Emission Purge Pump
Evaporative Emission Purge Pump harness is open or shorted
Evaporative Emission Purge Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC U111E GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U111E GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U111E GMC code?

Need more information on how to fix the U111E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U111E GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

U111E 2019 GMC Sierra — Lost Communication with EVAP Purge Pump
U111E 2020 GMC Sierra — Lost Communication with EVAP Purge Pump
U111E 2021 GMC Sierra — Lost Communication with EVAP Purge Pump
U111E 2022 GMC Sierra — Lost Communication with EVAP Purge Pump

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 GMC Code

1. What are the common symptoms of OBDII code U111E GMC (Lost Communication with EVAP Purge Pump)?

- Common symptoms include the check engine light illuminating, rough idling, poor fuel efficiency, and potential issues with the EVAP system.

2. What are some possible causes of U111E GMC code?

- Possible causes include a faulty EVAP purge pump, damaged wiring or connectors in the EVAP system, a malfunctioning PCM, or a communication error within the vehicle's network.

3. How can I diagnose the U111E GMC code?

- Diagnosing the code involves using an OBDII scanner to read the trouble codes, performing a visual inspection of the EVAP system components, and testing the purge pump, wiring, and connectors for proper functionality.

4. What are the repair options for U111E GMC code?

- Repair options may include replacing the EVAP purge pump, repairing or replacing damaged wiring or connectors, reprogramming the PCM, or addressing any communication network issues within the vehicle.

5. Can I drive my vehicle with the U111E GMC code?

- It is not recommended to drive your vehicle with the U111E GMC code present, as it can lead to potential issues with the EVAP system and affect overall vehicle performance and emissions.

6. How much does it typically cost to repair U111E GMC code?

- The cost of repairing the U111E GMC code can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

7. Can I reset the U111E GMC code on my own?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Are there any preventive maintenance tips to avoid U111E GMC code?

- Regularly inspecting and maintaining the EVAP system components, such as the purge pump, hoses, and connectors, can help prevent issues that may trigger the U111E GMC code.

9. Will the U111E GMC code affect my vehicle's emissions test?

- Yes, the U111E GMC code can potentially cause your vehicle to fail an emissions test, as it indicates a problem with the EVAP system, which is crucial for controlling fuel vapors and emissions.

10. How long does it take to repair the U111E GMC code?

- The repair time for the U111E GMC code can vary depending on the specific issue and the availability of parts, but it may take anywhere from a few hours to a day to complete the repair.