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Engine-Codes – Generic – U11D9

U11D9 Code - Lost Engine Off Time Message

Quick Answer

The U11D9 diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Engine Off Time (EOT) message. Common causes include Faulty engine off time sensor, Wiring or connection issues in the EOT message circuit, Malfunctioning onboard computer 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
U11D9 indicates Lost Engine Off Time Message.
Common causes
Common causes include Faulty engine off time sensor, Wiring or connection issues in the EOT message circuit, Malfunctioning onboard computer 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 10, 2024
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Code U11D9 Description

The U11D9 diagnostic trouble code indicates that the vehicle's onboard computer system has lost communication with the Engine Off Time (EOT) message. This message is crucial for tracking the amount of time the engine has been off, which is used for various functions such as calculating fuel efficiency, emissions control, and system diagnostics. When this message is lost, it can lead to a variety of issues affecting the vehicle's performance and overall functionality.

OBDII Code U11D9 - Lost Engine Off Time Message
U11D9 Code - Lost Engine Off Time Message

Common Causes of U11D9

  1. Faulty engine off time sensor
  2. Wiring or connection issues in the EOT message circuit
  3. Malfunctioning onboard computer system
  4. Corrosion or damage to related components
  5. Software or programming errors

Symptoms of U11D9

  1. Check Engine Light illuminated on the dashboard
  2. Decreased fuel efficiency
  3. Rough idling or stalling
  4. Difficulty starting the vehicle
  5. Inaccurate or fluctuating fuel gauge readings

How to Fix U11D9

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and identify the specific issue related to the lost Engine Off Time message.
  2. Inspect the engine off time sensor and related wiring for any visible damage or corrosion. Replace any faulty components as needed.
  3. Check the connections in the EOT message circuit for loose or damaged wiring, ensuring a secure connection.
  4. If the issue persists, troubleshoot the onboard computer system to determine if there are any software or programming errors causing the communication loss.
  5. Clear the trouble codes from the system and perform a test drive to ensure that the issue has been resolved.

Cost to Fix U11D9

The repair costs for addressing the U11D9 code 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 $100 to $300 for parts and labor. However, it's important to note that auto repair shops may charge between $80 to $150 per hour for labor, and rates can vary based on location, vehicle make and model, and the complexity of the repair. It's advisable to obtain quotes from multiple shops to compare prices and ensure you're getting a fair deal.

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Code U11D9 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 U11D9 Code

1. What are the common symptoms of the OBDII code U11D9 (Lost Engine Off Time Message)?

The common symptoms of U11D9 may include issues with the engine shutting off unexpectedly, difficulty starting the engine, and the vehicle stalling while driving.

2. What could cause the OBDII code U11D9 (Lost Engine Off Time Message) to appear?

U11D9 can be triggered by a malfunction in the engine control module (ECM), a faulty ignition switch, wiring issues, or a weak battery.

3. How can I diagnose the OBDII code U11D9 (Lost Engine Off Time Message)?

To diagnose U11D9, you can use an OBDII scanner to retrieve the code, inspect the ignition switch and wiring for any visible damage, and test the battery and charging system.

4. Are there any DIY repair tips for resolving the OBDII code U11D9?

DIY repair tips for U11D9 include checking and replacing a faulty ignition switch, repairing damaged wiring, ensuring a strong battery connection, and clearing the code with an OBDII scanner.

5. Can driving with the OBDII code U11D9 (Lost Engine Off Time Message) cause further damage to the vehicle?

Continuing to drive with U11D9 may lead to more severe issues such as engine stalling at inconvenient times or complete engine failure, so it is recommended to address the problem promptly.

6. Is it safe to ignore the OBDII code U11D9 (Lost Engine Off Time Message)?

Ignoring U11D9 can result in unexpected engine shutdowns, which may pose a safety risk while driving. It is advisable to address the underlying cause of the code as soon as possible.

7. How much does it typically cost to repair the OBDII code U11D9 (Lost Engine Off Time Message)?

The cost of repairing U11D9 can vary depending on the specific cause of the code and the labor rates in your area. Simple fixes like replacing an ignition switch may be relatively inexpensive, while more complex issues could be costly.

8. Can a mechanic easily reset the OBDII code U11D9 (Lost Engine Off Time Message) after repair?

Yes, a mechanic can reset the U11D9 code using an OBDII scanner after the underlying issue has been fixed. This will clear the code from the system and turn off the check engine light.

9. Will the OBDII code U11D9 (Lost Engine Off Time Message) prevent my vehicle from passing an emissions test?

If U11D9 is causing the engine to run improperly or stall, it may affect your vehicle's ability to pass an emissions test. It is recommended to address the issue before taking the vehicle for testing.

10. How long does it typically take to repair the OBDII code U11D9 (Lost Engine Off Time Message)?

The repair time for U11D9 can vary depending on the complexity of the underlying issue. Simple fixes may take a few hours, while more involved repairs could require a day or more to complete.

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