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U0059 Code - Vehicle Communication Bus 'D' (+) High

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
U0059 indicates Vehicle Communication Bus 'D' (+) High.
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 2,728
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 29, 2020
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Code U0059 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 U0059 - Vehicle Communication Bus 'D' (+) High - AutoCodes.com
U0059 Code - Vehicle Communication Bus 'D' (+) High
What does this mean?

What are the Possible Causes of the DTC U0059?

  • 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 U0059?

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 U0059 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 U0059 code?

Need more information on how to fix the U0059 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0059 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 U0059 Code

1. What does OBDII code U0059 mean?

U0059 indicates an issue with the Vehicle Communication Bus 'D' (+) High, which is part of the network that allows vehicle modules to communicate.

2. What are the common symptoms of code U0059?

Symptoms may include warning lights on the dashboard, loss of communication between modules, intermittent electrical issues, or failure of certain vehicle systems like ABS or traction control.

3. What causes the U0059 code to appear?

Common causes include damaged wiring or connectors, a short or open circuit in the bus line, a faulty module on the communication network, or a malfunctioning control module.

4. Is code U0059 serious?

Yes, it can be serious as it may lead to communication failures between critical vehicle systems, potentially affecting drivability or safety.

5. How do I diagnose code U0059?

Start by inspecting the wiring and connectors for damage or corrosion. Use a scan tool to check for additional codes and perform continuity tests on the communication bus.

6. Can I still drive my car with code U0059?

It depends on the severity of the issue. If critical systems like ABS or stability control are affected, it’s not safe to drive until the problem is resolved.

7. What repairs can fix code U0059?

Repairs may include replacing damaged wiring, repairing or replacing faulty connectors, or replacing a malfunctioning module on the communication network.

8. Can a low battery cause code U0059?

Yes, a low or failing car battery can sometimes disrupt communication between modules and trigger this code.

9. How much does it cost to fix code U0059?

Repair costs vary depending on the issue but may range from $100 for basic wiring repairs to $1,000 or more if a module needs replacement.

10. Can I clear the U0059 code without fixing the issue?

You can clear the code with a scan tool, but if the underlying problem isn’t addressed, the code will likely return.

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