AutoCodes – Toyota – U0151 Toyota

U0151 Toyota 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 Toyota 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 2,815

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 27, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0151 Toyota 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 Toyota - Lost Communication with Airbag ECU - AutoCodes.com — U0151 Toyota Code - Lost Communication with Airbag ECU

What does this mean?

What are the Possible Causes of the DTC U0151 Toyota?

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 Toyota?

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 Toyota 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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Need Help with the Code?

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Information for Specific Toyota Models

U0151 2013 Toyota RAV4 — Lost Communication with Airbag ECU
U0151 2014 Toyota RAV4 — Lost Communication with Airbag ECU
U0151 2015 Toyota RAV4 — Lost Communication with Airbag ECU
U0151 2016 Toyota RAV4 — Lost Communication with Airbag ECU
U0151 2017 Toyota RAV4 — Lost Communication with Airbag ECU
U0151 2018 Toyota RAV4 — 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 Toyota Code

1. What does the OBDII code U0151 Toyota "Lost Communication with Airbag ECU" mean?

This code indicates a communication problem between the vehicle's onboard diagnostics system and the airbag electronic control unit (ECU).

2. What are common symptoms of the U0151 code in a Toyota?

Common symptoms include the airbag warning light staying illuminated on the dashboard, loss of communication with the airbag system, and potential non-deployment of airbags in the event of a crash.

3. What are possible causes of the U0151 code in a Toyota?

Potential causes include damaged wiring or connectors between the OBD system and the airbag ECU, a faulty airbag ECU, a blown fuse related to the airbag system, or software issues.

4. How can I diagnose the U0151 code on my Toyota?

Diagnosing the U0151 code typically involves using a diagnostic scanner to retrieve the code, checking the airbag system's wiring and connectors for damage, testing the fuses related to the airbag system, and ensuring the airbag ECU is functioning properly.

5. Can I still drive my Toyota with the U0151 code present?

It is not recommended to drive the vehicle with the U0151 code present, as it indicates a potential issue with the airbag system's functionality. It's crucial to address the problem promptly to ensure the airbags deploy correctly in case of an accident.

6. How can I repair the U0151 code in my Toyota?

Repairing the U0151 code may involve repairing or replacing damaged wiring or connectors, replacing the faulty airbag ECU, resetting the system, or updating the software to resolve communication issues.

7. Is it safe to reset the U0151 code without fixing the underlying issue?

Resetting the code without addressing the underlying problem is not recommended, as it may lead to safety risks in the event of a collision. It's essential to identify and resolve the root cause of the communication loss with the airbag ECU.

8. Can a DIY enthusiast fix the U0151 code issue in a Toyota?

While diagnosing the U0151 code is possible for DIY enthusiasts with the right tools and knowledge, fixing the issue may require specialized equipment and expertise. It's advisable to consult a professional mechanic for proper diagnosis and repair.

9. How much does it typically cost to repair the U0151 code in a Toyota?

The cost of repairing the U0151 code can vary depending on the underlying cause of the communication loss with the airbag ECU. Costs may include labor charges for diagnosis and repair, replacement parts, and any necessary software updates.

10. How can I prevent the U0151 code from reoccurring in my Toyota?

To prevent the U0151 code from reoccurring, it's essential to address the root cause of the communication issue thoroughly. Regular maintenance checks, prompt repairs of any wiring or connector damage, and software updates can help prevent this code from appearing again.