U111E Buick 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 Buick 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.
Code U111E Buick Description
What are the Possible Causes of the DTC U111E Buick?
- 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 Buick?
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 Buick 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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Frequently Asked Questions about U111E Buick Code
1. What does the OBDII code U111E mean on a Buick?
Code U111E indicates a "Lost Communication with EVAP Purge Pump," meaning the vehicle's control module is unable to communicate with the EVAP purge pump module.
2. What are the common symptoms of code U111E in a Buick?
Symptoms may include the check engine light turning on, poor fuel efficiency, difficulty starting the engine, or a failed emissions test.
3. What causes code U111E to appear in a Buick?
Possible causes include a faulty EVAP purge pump, damaged wiring or connectors in the EVAP system, a failed control module, or communication errors in the vehicle's network.
4. Can I drive my Buick with code U111E active?
While the car may still be drivable, ignoring the issue can lead to increased emissions, potential engine performance issues, and failure to pass an emissions test.
5. How do I diagnose code U111E in my Buick?
Start by inspecting the EVAP purge pump wiring and connectors for damage or corrosion. Use a scan tool to check for related codes and verify module communication.
6. How is code U111E repaired on a Buick?
Repairs may involve replacing the EVAP purge pump, repairing damaged wiring, cleaning corroded connectors, or reprogramming the control module.
7. What tools are needed to troubleshoot code U111E?
A diagnostic scan tool capable of reading U-codes, a multimeter to test wiring, and possibly a service manual for the specific Buick model.
8. How much does it cost to fix code U111E on a Buick?
Repair costs vary but could range from $100 to $400 depending on whether the issue is with the pump, wiring, or control module.
9. Can a loose gas cap trigger code U111E in a Buick?
No, a loose gas cap typically triggers EVAP leak codes like P0442 or P0455, not a communication error like U111E.
10. Will clearing the code U111E with a scan tool fix the issue?
Clearing the code will remove it temporarily, but the root cause must be addressed to prevent the code from returning.
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