AutoCodes – Generic – U0057

U0057 Code - Vehicle Communication Bus 'D' (+) Open

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module. 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: U0057 indicates Vehicle Communication Bus 'D' (+) Open.
Common causes: Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module.
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 3,321

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 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0057 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 supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0057 - Vehicle Communication Bus 'D' (+) Open - AutoCodes.com — U0057 Code - Vehicle Communication Bus 'D' (+) Open

What does this mean?

What are the Possible Causes of the DTC U0057?

Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0057?

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 U0057 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 U0057 code?

Need more information on how to fix the U0057 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0057 code diagnosed by a professional: Find a repair shop in your area

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 U0057 Code

1. What are the common symptoms of OBDII code U0057?

- Common symptoms include issues with communication between vehicle modules, malfunctioning dashboard warning lights, and potential difficulties with vehicle starting or running.

2. What are the possible causes of OBDII code U0057?

- Possible causes include a damaged communication bus wire, loose connections in the wiring harness, faulty control modules, or a malfunctioning CAN network.

3. How can I diagnose OBDII code U0057?

- Diagnosing this code typically involves using a scan tool to check for other related trouble codes, inspecting the wiring for visible damage, and testing the communication bus circuits for continuity.

4. Can OBDII code U0057 be repaired easily?

- The repair difficulty can vary depending on the root cause of the issue. Simple fixes such as reconnecting loose wires may be easy, while replacing a faulty control module or repairing damaged wiring can be more complex.

5. Is it safe to drive with OBDII code U0057 present?

- It is not recommended to drive with this code present as it can affect the communication between critical vehicle systems, potentially leading to safety hazards or further damage.

6. How much does it typically cost to repair OBDII code U0057?

- The cost of repairing this code can vary widely depending on the extent of the issue and the specific components that need to be repaired or replaced. Costs can range from a few hundred to over a thousand dollars.

7. Can I reset OBDII code U0057 with a simple reset tool?

- Resetting the code with a basic reset tool may temporarily clear the error code, but it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. What steps can I take to prevent OBDII code U0057 from appearing again?

- Regular vehicle maintenance, checking for loose connections, ensuring proper wiring harness integrity, and promptly addressing any communication issues within the vehicle can help prevent this code from reappearing.

9. Will OBDII code U0057 cause my vehicle to fail an emissions test?

- Depending on the severity of the issue and local emissions regulations, having this code present may cause your vehicle to fail an emissions test. It is advisable to address the problem before undergoing an emissions test.

10. Can a DIY enthusiast repair OBDII code U0057 at home?

- While some basic troubleshooting steps can be performed at home, diagnosing and repairing OBDII code U0057 may require specialized tools, technical knowledge, and expertise, making it more suitable for professional assistance.