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Engine-Codes – Generic – U111E

U111E Code - Lost Communication with EVAP Purge Pump

Quick Answer

The U111E code indicates that the vehicle's engine control module (ECM) has lost communication with the evaporative emission (EVAP) purge pump. Common causes include Faulty Purge Pump: The purge pump itself may be malfunctioning, causing the communication loss with the ECM, Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and purge pump can disrupt communication, ECM Malfunction: A faulty ECM can also prevent communication with the purge 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
U111E indicates Lost Communication with EVAP Purge Pump.
Common causes
Common causes include Faulty Purge Pump: The purge pump itself may be malfunctioning, causing the communication loss with the ECM, Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and purge pump can disrupt communication, ECM Malfunction: A faulty ECM can also prevent communication with the purge 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 06, 2024
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Code U111E Description

The U111E code indicates that the vehicle's engine control module (ECM) has lost communication with 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 component of this system that helps to control the flow of fuel vapors. When communication is lost with the purge pump, it can lead to issues with the EVAP system's functionality, potentially causing emissions to exceed acceptable levels.

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

Common Causes of U111E

  1. Faulty Purge Pump: The purge pump itself may be malfunctioning, causing the communication loss with the ECM.
  2. Wiring Issues: Corroded, damaged, or loose wiring connections between the ECM and purge pump can disrupt communication.
  3. ECM Malfunction: A faulty ECM can also prevent communication with the purge pump.
  4. Electrical Problems: Other electrical issues within the EVAP system or related components can lead to a loss of communication.

Symptoms of U111E

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Rough Idle: The vehicle may experience a rough or unstable idle when the purge pump is not functioning correctly.
  3. Decreased Fuel Efficiency: A malfunctioning EVAP system can lead to reduced fuel efficiency as fuel vapors are not being properly captured and recycled.
  4. Failed Emissions Test: If the vehicle's emissions exceed legal limits due to the EVAP system issue, it may fail an emissions test.

How to Fix U111E

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the U111E code and further investigate the cause of the communication loss.
  2. Inspect Wiring: Check the wiring harness between the ECM and purge pump for any damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test Purge Pump: Test the purge pump to determine if it is functioning correctly. Replace if it is found to be faulty.
  4. Check ECM: Inspect the ECM for any signs of damage or malfunction. Replace if necessary.
  5. Clear Codes: Once the repairs have been completed, clear the U111E code from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U111E

The cost of repairing a U111E code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair for this code can range from $200 to $500, including parts and labor. However, it is recommended to contact local auto repair shops for a more accurate estimate based on your vehicle make and model, as well as the severity of the issue. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the communication loss.

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Code U111E 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 U111E Code

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

The common symptoms include the check engine light coming on, rough idling, decreased fuel efficiency, and potential issues with the EVAP system.

2. What are the possible causes of OBDII code U111E?

Possible causes of U111E can include faulty wiring or connections in the EVAP purge pump circuit, a malfunctioning EVAP purge pump, or issues with the powertrain control module (PCM).

3. How can I diagnose OBDII code U111E?

Diagnosing U111E typically involves using a diagnostic scanner to retrieve the trouble code, conducting a visual inspection of the EVAP system components, checking the wiring and connections related to the EVAP purge pump, and performing tests to pinpoint the exact cause of the communication loss.

4. Can I still drive my vehicle with OBDII code U111E?

While it is possible to drive the vehicle with code U111E, it is recommended to have the issue diagnosed and repaired as soon as possible to prevent potential damage to the EVAP system or other components.

5. How can I repair OBDII code U111E?

Repairing U111E may involve repairing or replacing damaged wiring or connections, replacing the EVAP purge pump if it is faulty, or addressing any issues with the PCM that are causing the communication loss.

6. Is it possible to reset OBDII code U111E without fixing the underlying issue?

While clearing the trouble code using a diagnostic scanner may temporarily turn off the check engine light, the code is likely to return if the root cause of the communication loss is not addressed.

7. Are there any DIY tips for troubleshooting OBDII code U111E?

DIY tips for troubleshooting U111E include checking the EVAP purge pump fuse, inspecting the wiring harness for damage, ensuring all connections are secure, and checking for any signs of corrosion or contamination.

8. Can a mechanic help me fix OBDII code U111E?

Yes, a qualified mechanic can diagnose and repair OBDII code U111E by conducting a thorough inspection, performing necessary tests, and making the appropriate repairs to resolve the communication loss with the EVAP purge pump.

9. How much does it cost to repair OBDII code U111E?

The cost of repairing U111E can vary depending on the root cause of the issue, the extent of the repair needed, and the labor rates of the mechanic. It is recommended to obtain quotes from different repair shops for an accurate estimate.

10. Will OBDII code U111E affect my vehicle's emissions or performance?

Code U111E, if left unresolved, can potentially impact your vehicle's emissions and performance by causing issues with the EVAP system, leading to decreased fuel efficiency and increased emissions. It is best to address the issue promptly to maintain optimal vehicle operation.

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