AutoCodes – Generic – U1110

U1110 Code - Lost Communication with Clearance Warning ECU

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Clearance Warning ECU, Clearance Warning ECU harness is open or shorted. 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: U1110 indicates Lost Communication with Clearance Warning ECU.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Clearance Warning ECU, Clearance Warning ECU harness is open or shorted.
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 33,213

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 Mar 26, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1110 Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Clearance Warning ECU has not been received.

OBDII Code U1110 - Lost Communication with Clearance Warning ECU - AutoCodes.com — U1110 Code - Lost Communication with Clearance Warning ECU

What does this mean?

What are the Possible Causes of the DTC U1110?

Faulty Controller Area Network (CAN) Communication System
Faulty Clearance Warning ECU
Clearance Warning ECU harness is open or shorted
Clearance Warning ECU circuit poor electrical connection

How to Fix the DTC U1110?

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 does this mean?

Code Tech Notes

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1110 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.

Need more information about the U1110 code?

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Need Help with the Code?

Get the U1110 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1110 Chrysler — Lost Vehicle Speed Message
U1110 Dodge — Lost Vehicle Speed Message
U1110 Jeep — Lost Vehicle Speed Message
U1110 Lexus — Lost Communication with Clearance Warning ECU
U1110 Toyota — Lost Communication with Clearance Warning ECU

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 U1110 Code

1. What are common symptoms of OBDII code U1110 (Lost Communication with Clearance Warning ECU)?

- Common symptoms include the malfunction indicator light (MIL) illuminating, loss of communication with the clearance warning ECU, and potential issues with the clearance warning system.

2. What are possible causes of OBDII code U1110?

- Possible causes include damaged wiring or connectors, a faulty clearance warning ECU, software issues, or a communication network problem within the vehicle.

3. How can I diagnose OBDII code U1110?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking for any other related codes, inspecting the wiring and connectors for damage, and testing the clearance warning ECU for proper functionality.

4. Is it safe to continue driving with OBDII code U1110 present?

- It is generally not recommended to continue driving with this code present, as it may indicate a problem with an important safety system in the vehicle.

5. Can I reset the OBDII code U1110 on my own?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from recurring.

6. How much does it typically cost to repair OBDII code U1110?

- The cost of repairs can vary depending on the specific cause of the code. It is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.

7. Are there any DIY repair tips for OBDII code U1110?

- DIY repair for this code may involve checking and repairing any damaged wiring or connectors related to the clearance warning system, but it is advisable to seek professional help for a thorough diagnosis and repair.

8. Can a low battery voltage trigger OBDII code U1110?

- Yes, a low battery voltage or electrical issues in the vehicle can potentially disrupt communication and trigger code U1110. It is important to ensure the battery and the vehicle's electrical system are in good working condition.

9. How long does it take to repair OBDII code U1110?

- The repair time can vary depending on the specific cause of the code and the complexity of the repair needed. Some cases may be resolved quickly, while others may require more time for diagnosis and repair.

10. Will OBDII code U1110 cause my vehicle to fail an emissions test?

- If the code is related to a malfunction in the clearance warning system, it may not directly cause the vehicle to fail an emissions test. However, it is important to address the code to ensure all vehicle systems are functioning properly.