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U111E Cadillac Code - Lost Communication with EVAP Purge Pump

Quick Answer

The U111E diagnostic trouble code for Cadillac vehicles indicates that there is a communication error with the EVAP (Evaporative Emission Control System) purge pump. Common causes include Faulty EVAP purge pump, Wiring or connector issues, Corrosion or damage to the EVAP system. 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 Cadillac indicates Lost Communication with EVAP Purge Pump.
Common causes
Common causes include Faulty EVAP purge pump, Wiring or connector issues, Corrosion or damage to the EVAP system.
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 Cadillac Description

The U111E diagnostic trouble code for Cadillac vehicles indicates that there is a communication error with the EVAP (Evaporative Emission Control System) purge pump. The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank to prevent them from escaping into the atmosphere. The purge pump plays a crucial role in this system by drawing fuel vapors into the engine to be burned during combustion.

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

Common Causes of U111E Cadillac

  1. Faulty EVAP purge pump
  2. Wiring or connector issues
  3. Corrosion or damage to the EVAP system
  4. Software or communication errors within the vehicle's computer system

Symptoms of U111E Cadillac

  1. Check engine light illuminated on the dashboard
  2. Poor fuel efficiency
  3. Rough idling
  4. Hesitation during acceleration
  5. Stalling

How to Fix U111E Cadillac

  1. Perform a diagnostic scan to confirm the U111E code and pinpoint the exact issue
  2. Inspect the EVAP purge pump, wiring, and connectors for any visible damage or corrosion
  3. Test the EVAP purge pump to ensure it is functioning correctly
  4. Repair or replace any faulty components, such as the purge pump or wiring
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved

Cost to Fix U111E Cadillac

The cost of repairing a U111E code on a Cadillac can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay between $200 and $500 for parts and labor. It's important to note that diagnostic time and labor rates can vary, so it's recommended to obtain quotes from multiple auto repair shops to get the most 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 Cadillac Code

1. What does the OBDII code U111E mean on a Cadillac?

The U111E code indicates a "Lost Communication with EVAP Purge Pump," meaning the vehicle's control module can't communicate with the EVAP purge pump.

2. What are the common symptoms of the U111E code on a Cadillac?

Symptoms include a check engine light, poor fuel efficiency, difficulty starting, or issues passing emissions tests due to EVAP system malfunction.

3. What causes the U111E code on a Cadillac?

Common causes include a faulty EVAP purge pump, wiring or connector issues, a malfunctioning control module, or software glitches.

4. Can I drive my Cadillac with the U111E code?

While the car may remain drivable, ignoring this code can lead to increased emissions and potential damage to the EVAP system over time.

5. How do I diagnose the U111E code on a Cadillac?

Diagnosis involves checking the EVAP purge pump's wiring, inspecting connectors for damage or corrosion, and using a scan tool to verify communication between the pump and control module.

6. How do I fix the U111E code on a Cadillac?

Repairs may include replacing the EVAP purge pump, repairing damaged wiring or connectors, or updating the vehicle's software if a glitch is identified.

7. What tools are needed to fix the U111E code on a Cadillac?

You'll need an OBDII scanner, a multimeter for testing electrical connections, and possibly replacement parts like the purge pump or wiring harness.

8. Is the U111E code specific to Cadillacs?

While U111E is commonly associated with Cadillac models, similar communication-related codes may appear in other vehicle brands with EVAP system issues.

9. How much does it cost to repair the U111E code on a Cadillac?

Repair costs can range from $150 to $500, depending on whether the issue is with wiring, connectors, or the EVAP purge pump itself.

10. Can a software update fix the U111E code on a Cadillac?

In some cases, a software update from the dealership can resolve the issue if the problem is due to a communication glitch between the module and the pump.

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