AutoCodes – Cadillac – U111E Cadillac

U111E Cadillac 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 Cadillac 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 756

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

What does this mean?

What are the Possible Causes of the DTC U111E Cadillac?

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 Cadillac?

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 Cadillac 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.

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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.