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AutoCodes – Generic – U0139

U0139 Code - Lost Communication With Suspension Control 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 Suspension Control Module 'B', Suspension Control Module 'B' harness is open or shorted, Suspension Control 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
U0139 indicates Lost Communication With Suspension Control Module 'B'.
Common causes
Common causes include Faulty Suspension Control Module 'B', Suspension Control Module 'B' harness is open or shorted, Suspension Control 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 8,068
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 31, 2020
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Code U0139 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 Suspension Control Module 'B' has not been received.
OBDII Code U0139 - Lost Communication With Suspension Control Module 'B' - AutoCodes.com
U0139 Code - Lost Communication With Suspension Control Module 'B'
What does this mean?

What are the Possible Causes of the DTC U0139?

  • Faulty Suspension Control Module 'B'
  • Suspension Control Module 'B' harness is open or shorted
  • Suspension Control Module 'B' circuit poor electrical connection

How to Fix the DTC U0139?

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 U0139 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 U0139 code?

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Need Help with the Code?

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Information for Specific Makes

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 U0139 Code

What does OBDII code U0139 mean?

Code U0139 indicates a loss of communication with the Suspension Control Module 'B,' which may affect vehicle handling and responsiveness.

What are the common symptoms of code U0139?

Symptoms may include suspension system warnings on the dashboard, poor ride quality, or the suspension not adjusting as intended.

What causes code U0139 to appear?

Common causes include damaged wiring, faulty connectors, a failed Suspension Control Module 'B,' or network communication issues in the CAN bus system.

Can I still drive my vehicle with code U0139?

While the vehicle may remain drivable, the suspension system may not function properly, potentially affecting ride comfort and handling.

How is code U0139 diagnosed?

Technicians typically use a scan tool to check for communication with the Suspension Control Module 'B,' inspect wiring and connectors, and test the CAN bus network.

What tools are needed to troubleshoot code U0139?

Tools may include a diagnostic scan tool, multimeter, wiring diagrams, and sometimes an oscilloscope to analyze CAN bus signals.

How do I fix code U0139?

Repairs may include reconnecting or replacing damaged wiring, cleaning or replacing connectors, or replacing the Suspension Control Module 'B' if it’s defective.

Can code U0139 be triggered by a dead battery?

Yes, a low or dead battery can disrupt communication in the CAN bus network, potentially causing U0139 and other related codes.

Does code U0139 require module reprogramming?

If the Suspension Control Module 'B' is replaced, it may need to be programmed or configured using specialized tools to work with the vehicle.

How much does it cost to repair code U0139?

Repair costs vary depending on the issue but may range from $100 for wiring repairs to $800 or more for module replacement and programming.

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