AutoCodes – Generic – U0151

U0151 Code - Lost Communication with Airbag 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 Airbag ECU, Airbag 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: U0151 indicates Lost Communication with Airbag ECU.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Airbag ECU, Airbag 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 52,323

How popular is this code, among other codes? Medium

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 27, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0151 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 Airbag ECU has not been received.

OBDII Code U0151 - Lost Communication with Airbag ECU - AutoCodes.com — U0151 Code - Lost Communication with Airbag ECU

What does this mean?

What are the Possible Causes of the DTC U0151?

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

How to Fix the DTC U0151?

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 U0151 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 U0151 code?

Need more information on how to fix the U0151 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0151 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0151 Buick — Lost Communication With Inflatable Restraint Sensing And Diagnostic Module
U0151 Cadillac — Lost Communication With Inflatable Restraint Sensing And Diagnostic Module
U0151 Chevrolet — Lost Communication With Inflatable Restraint Sensing And Diagnostic Module
U0151 Chrysler — Lost Communication With Occupant Restraints Controller
U0151 Dodge — Lost Communication With Occupant Restraints Controller
U0151 Ford — Lost Communication with Restraints Control Module
U0151 GMC — Lost Communication With Inflatable Restraint Sensing And Diagnostic Module
U0151 Jeep — Lost Communication With Occupant Restraints Controller
U0151 Lexus — Lost Communication with Airbag ECU
U0151 Lincoln — Lost Communication with Restraints Control Module
U0151 Mercury — Lost Communication with Restraints Control Module
U0151 RAM — Lost Communication With Occupant Restraints Controller
U0151 Toyota — Lost Communication with Airbag 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 U0151 Code

1. What are common symptoms of OBDII code U0151 (Lost Communication with Airbag ECU)?

- Common symptoms include the airbag warning light being illuminated on the dashboard, loss of communication with the airbag control module, and potential issues with the airbag system functionality.

2. What are possible causes of OBDII code U0151?

- Possible causes include a faulty airbag control module, damaged wiring or connectors, a blown fuse related to the airbag system, or a communication error within the vehicle's network.

3. How can I diagnose the cause of OBDII code U0151?

- Diagnosing the cause of U0151 typically involves using a diagnostic scanner to retrieve the specific codes, checking the wiring and connectors for any visible damage, and testing the airbag control module for proper functionality.

4. Can OBDII code U0151 be fixed by resetting the vehicle's computer?

- Resetting the vehicle's computer may temporarily clear the code, but it will likely return if the underlying issue, such as a communication problem with the airbag control module, is not addressed.

5. Are there any safety concerns associated with OBDII code U0151?

- Yes, there are safety concerns as the code indicates a loss of communication with the airbag control module, potentially impacting the functionality of the airbag system in the event of a collision.

6. What are some repair tips for addressing OBDII code U0151?

- Repair tips include checking and repairing any damaged wiring or connectors, ensuring the airbag control module is functioning properly, and verifying that the vehicle's network communication is stable.

7. Is it safe to drive with OBDII code U0151 present?

- It is not recommended to drive with OBDII code U0151 present, as the code indicates a potential issue with the airbag system, which is a critical safety component in the event of an accident.

8. Can a DIY enthusiast repair OBDII code U0151, or is professional help required?

- While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing OBDII code U0151 may require specialized tools and expertise, so professional help is often recommended.

9. How much does it typically cost to repair OBDII code U0151?

- The cost of repairing OBDII code U0151 can vary depending on the underlying cause, but it may involve expenses related to parts replacement, labor costs, and diagnostic fees from a mechanic or dealership.

10. Will OBDII code U0151 cause my vehicle to fail an emissions test?

- OBDII code U0151 is not directly related to emissions, so it should not cause your vehicle to fail an emissions test. However, it is still important to address the issue promptly for safety reasons.

1. What are the common symptoms of OBDII code U0151 (Lost Communication with Airbag ECU)?

- Common symptoms include the airbag warning light illuminating on the dashboard, loss of communication with the airbag system, and potential issues with the airbag deployment.

2. What are the possible causes of OBDII code U0151?

- The code can be triggered by a faulty airbag control module, damaged wiring or connectors, a blown fuse, a software glitch, or issues with the vehicle's communication network.

3. How can I diagnose the root cause of OBDII code U0151?

- Diagnosing the issue involves checking the wiring and connectors for damage, ensuring the fuse related to the airbag system is intact, inspecting the airbag control module, and using a diagnostic scanner to communicate with the airbag ECU.

4. Is it safe to drive with OBDII code U0151 present?

- It is not recommended to drive with U0151 code active, as it indicates a potential problem with the airbag system, which can compromise your safety in the event of an accident.

5. Can I reset the OBDII code U0151 on my own?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the communication loss with the airbag ECU to ensure the system functions properly.

6. How much does it cost to repair OBDII code U0151?

- The cost of repair can vary depending on the root cause of the issue. It may involve replacing the airbag control module, repairing damaged wiring, or addressing other related components, so it's best to consult with a professional for an accurate estimate.

7. Are there any safety precautions to take when dealing with OBDII code U0151?

- When working on the airbag system, always disconnect the vehicle's battery and wait for at least 10 minutes before starting any repairs to avoid accidental airbag deployment.

8. Can a DIY enthusiast fix OBDII code U0151 at home?

- While some basic troubleshooting steps can be performed at home, resolving OBDII code U0151 may require specialized tools and expertise, so it's advisable to seek assistance from a qualified mechanic or automotive technician.

9. Will OBDII code U0151 affect the overall performance of my vehicle?

- The code itself may not impact the vehicle's performance directly, but it indicates a potential safety issue with the airbag system, which is crucial for your protection in case of a collision.

10. How long does it typically take to repair OBDII code U0151?

- The repair time can vary depending on the cause of the issue and the complexity of the repair. Simple fixes like replacing a blown fuse may take a short time, while more involved repairs could require several hours or even days.