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Engine-Codes – Generic – U110C

U110C Code - Lost Fuel Level Message

Quick Answer

The U110C code indicates that the vehicle's Engine Control Module (ECM) has lost communication with the Fuel Level Sensor Module (FLSM). Common causes include Faulty Fuel Level Sensor Module, Loose or corroded wiring connections between the ECM and FLSM, ECM software or hardware issues. 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
U110C indicates Lost Fuel Level Message.
Common causes
Common causes include Faulty Fuel Level Sensor Module, Loose or corroded wiring connections between the ECM and FLSM, ECM software or hardware issues.
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 07, 2024
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Code U110C Description

The U110C code indicates that the vehicle's Engine Control Module (ECM) has lost communication with the Fuel Level Sensor Module (FLSM). This means that the ECM is no longer receiving accurate fuel level information from the sensor, which can lead to various issues with the vehicle's fuel system. The fuel level sensor is responsible for measuring the amount of fuel in the tank and sending this data to the ECM, which uses it to calculate fuel consumption, optimize engine performance, and trigger the low fuel warning light when necessary.

OBDII Code U110C - Lost Fuel Level Message
U110C Code - Lost Fuel Level Message

Common Causes of U110C

  1. Faulty Fuel Level Sensor Module
  2. Loose or corroded wiring connections between the ECM and FLSM
  3. ECM software or hardware issues
  4. Water or debris contamination in the fuel tank affecting the sensor
  5. Electrical interference or signal disruption from other vehicle components

Symptoms of U110C

  1. Inaccurate fuel level readings on the dashboard gauge
  2. Low fuel warning light coming on unexpectedly
  3. Decreased fuel economy
  4. Rough idling or stalling
  5. Engine hesitation or misfires

How to Fix U110C

  1. Perform a visual inspection of the wiring connections between the ECM and FLSM to check for any loose or corroded connections.
  2. Test the Fuel Level Sensor Module using a multimeter to ensure it is functioning properly.
  3. Check for any software updates for the ECM and perform a reflash if necessary.
  4. Inspect the fuel tank for any contamination and clean or replace the Fuel Level Sensor Module as needed.
  5. Reset the ECM and clear the code to see if the issue persists after repairs have been made.

Cost to Fix U110C

The typical repair costs for addressing a U110C code can range from $100 to $500, depending on the specific cause of the issue and any parts that need to be replaced. This estimate includes the cost of diagnostic testing, labor, and potentially replacing the Fuel Level Sensor Module or repairing wiring connections. It's important to note that the actual cost can vary based on factors such as the vehicle make and model, location, and the rates charged by the auto repair shop. It's recommended to get a detailed quote from a trusted mechanic before proceeding with the repairs.

What does this mean?

Tech Notes for U110C

The Powertrain Control Module (PCM) continuously monitors the fuel level from the Fuel Level Sensor through the Body Control Module (BCM). The U110C code indicates that the PCM lost fuel level communication from the BCM. Start by checking the PCM and BCM harness connectors, retighten the connectors, and clear the code. Also, check the battery charge, as a low battery charge has been reported to trigger this code. If the problem persists, replacing the BCM will be necessary to repair the issue.

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Code U110C 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 U110C Code

1. What are common symptoms of OBDII code U110C (Lost Fuel Level Message)?

- Common symptoms include inaccurate fuel level readings on the dashboard, fluctuating fuel gauge, and potential illumination of the check engine light.

2. What causes the OBDII code U110C to trigger?

- The U110C code is typically triggered by communication issues between the fuel level sensor and the vehicle's electronic control module (ECM).

3. How can I diagnose the U110C code related to a lost fuel level message?

- It is important to start by checking the wiring and connectors related to the fuel level sensor, inspecting for any damage or loose connections that may be causing the issue.

4. Are there any quick fixes for the U110C code related to the lost fuel level message?

- In some cases, simply resetting the ECM by disconnecting the battery for a few minutes can resolve the communication error causing the U110C code.

5. Should I be concerned about driving with the U110C code present?

- While the U110C code itself may not directly affect the drivability of the vehicle, it is important to address the underlying issue to ensure accurate fuel level readings and proper functioning of the fuel system.

6. Can a DIY enthusiast repair the U110C code related to a lost fuel level message?

- Depending on the root cause of the issue, DIY enthusiasts with knowledge of automotive electrical systems may be able to address the U110C code by checking and repairing wiring connections.

7. Is it necessary to replace the fuel level sensor when dealing with the U110C code?

- In some cases, the issue causing the U110C code may be related to wiring or communication errors rather than a faulty fuel level sensor, so it's important to diagnose the problem accurately before replacing any parts.

8. Will the U110C code reset on its own after the issue is fixed?

- Once the issue causing the U110C code is resolved, the code may reset on its own after several successful drive cycles during which the ECM confirms proper communication with the fuel level sensor.

9. Can extreme weather conditions contribute to the U110C code appearing?

- Extreme temperature changes or moisture can potentially affect the electrical connections related to the fuel level sensor, leading to the U110C code triggering a lost fuel level message.

10. How can a professional mechanic help in diagnosing and repairing the U110C code?

- Experienced mechanics have the tools and expertise to perform advanced diagnostics, accurately pinpoint the cause of the U110C code, and make necessary repairs to ensure the issue is resolved effectively.

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