AutoCodes – Generic – U0157

U0157 Code - Lost Communication With Information Center Module 'B'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Information Center Module 'B', Information Center Module 'B' harness is open or shorted, Information Center Module 'B' circuit poor electrical connection. 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: U0157 indicates Lost Communication With Information Center Module 'B'.
Common causes: Common causes include Faulty Information Center Module 'B', Information Center Module 'B' harness is open or shorted, Information Center Module 'B' circuit poor electrical connection.
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 3,156

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 Apr 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0157 Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating 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 Information Center Module 'B' has not been received.

OBDII Code U0157 - Lost Communication With Information Center Module 'B' - AutoCodes.com — U0157 Code - Lost Communication With Information Center Module 'B'

What does this mean?

What are the Possible Causes of the DTC U0157?

Faulty Information Center Module 'B'
Information Center Module 'B' harness is open or shorted
Information Center Module 'B' circuit poor electrical connection

How to Fix the DTC U0157?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0157 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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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 U0157 Code

1. What are the common symptoms of OBDII code U0157 (Lost Communication With Information Center Module 'B')?

- Common symptoms include loss of communication with the information center module, issues with the instrument cluster, and warning lights on the dashboard.

2. What are some possible causes of OBDII code U0157?

- Possible causes include a faulty information center module, damaged wiring or connectors, a weak or dead battery, or issues with the vehicle's network communication system.

3. How can I diagnose the cause of OBDII code U0157?

- To diagnose the cause, you can use a diagnostic scan tool to check for codes and perform a thorough inspection of the information center module, wiring, connectors, and battery.

4. How can I repair OBDII code U0157?

- Repair options include repairing or replacing the information center module, repairing damaged wiring or connectors, ensuring a strong battery connection, and addressing any network communication system issues.

5. Can OBDII code U0157 cause any serious damage to my vehicle?

- While the code itself may not cause immediate serious damage, it can lead to issues with the instrument cluster and other related systems if left unresolved, affecting the overall functionality of the vehicle.

6. Is it safe to continue driving with OBDII code U0157 present?

- It is not recommended to continue driving with the code present, as it can impact the vehicle's communication systems and potentially lead to further electrical problems.

7. Can I reset OBDII code U0157 on my own?

- You may be able to clear the code temporarily by using a diagnostic scan tool to reset the system, but it is important to address the underlying cause to prevent the code from returning.

8. How much does it typically cost to repair OBDII code U0157?

- The cost of repair can vary depending on the specific cause of the code, but it may involve expenses for parts replacement, labor, and diagnostic services.

9. Are there any preventive measures to avoid OBDII code U0157 in the future?

- Regular maintenance checks, ensuring a strong battery connection, and addressing any electrical issues promptly can help prevent the recurrence of OBDII code U0157.

10. Do I need a professional mechanic to diagnose and repair OBDII code U0157?

- While some basic diagnostics can be done by the vehicle owner, it is recommended to consult a professional mechanic for a thorough diagnosis and proper repair of OBDII code U0157 to ensure the issue is adequately resolved.