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U1159 RAM Code - Lost Communication With Automatic Sway Bar System Module

Quick Answer

The U1159 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with the Automatic Sway Bar System Module. Common causes include Faulty Automatic Sway Bar System Module, Damaged wiring or connectors leading to the module, Software glitch in the vehicle's computer system. 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
U1159 RAM indicates Lost Communication With Automatic Sway Bar System Module.
Common causes
Common causes include Faulty Automatic Sway Bar System Module, Damaged wiring or connectors leading to the module, Software glitch in the vehicle's computer system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code U1159 RAM Description

The U1159 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with the Automatic Sway Bar System Module. The Automatic Sway Bar System is a component of the vehicle's suspension system that helps to stabilize the vehicle during cornering and off-road driving. When communication with this module is lost, it can lead to issues with the vehicle's handling and stability.

OBDII Code U1159 RAM - Lost Communication With Automatic Sway Bar System Module
U1159 RAM Code - Lost Communication With Automatic Sway Bar System Module

Common Causes of U1159 RAM

  1. Faulty Automatic Sway Bar System Module
  2. Damaged wiring or connectors leading to the module
  3. Software glitch in the vehicle's computer system
  4. Communication error between modules in the vehicle's network
  5. Corrosion or water damage affecting the module or wiring

Symptoms of U1159 RAM

  1. Increased body roll during cornering
  2. Unstable handling, especially on rough terrain
  3. Illumination of the traction control or stability control warning lights on the dashboard
  4. Harsh or bumpy ride quality
  5. Difficulty steering or controlling the vehicle at higher speeds

How to Fix U1159 RAM

  1. Begin by conducting a thorough visual inspection of the sway bar system module, wiring, and connectors to check for any visible damage or corrosion.
  2. Use a diagnostic scan tool to retrieve the specific trouble codes and data related to the communication loss with the Automatic Sway Bar System Module.
  3. Test the module's functionality by checking for power and ground signals, as well as verifying communication with the vehicle's computer system.
  4. If necessary, replace the faulty Automatic Sway Bar System Module and ensure proper installation and programming to establish communication with the vehicle's network.
  5. Clear the DTCs from the vehicle's computer system and perform a test drive to confirm that the issue has been resolved and the symptoms have been eliminated.

Cost to Fix U1159 RAM

The typical repair costs for addressing a lost communication issue with the Automatic Sway Bar System Module can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, replacing the module and addressing any related wiring or connector issues could range from $300 to $800, including parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate based on your vehicle make and model.

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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 U1159 RAM Code

1. What does the OBDII code U1159 mean on a RAM vehicle?

U1159 indicates that there is a lost communication issue between the vehicle's main control module and the Automatic Sway Bar System Module.

2. What are the common symptoms of the U1159 code?

Typical symptoms include a warning light on the dashboard, inability to engage or disengage the sway bar, reduced off-road capability, and potential drivability concerns.

3. What causes the U1159 code to appear?

The most common causes include damaged wiring, loose or corroded connectors, a faulty Automatic Sway Bar System Module, or issues with the CAN (Controller Area Network) communication bus.

4. Can I still drive my RAM with the U1159 code active?

While the vehicle can still be driven, off-road performance may be compromised, and ignoring the issue could lead to further damage or additional codes.

5. How do I diagnose the U1159 code?

Start by inspecting the wiring and connectors related to the sway bar system for damage or corrosion. Use a scan tool to check for communication with the sway bar module and test the CAN bus for continuity.

6. What tools are needed to troubleshoot the U1159 code?

You’ll need a diagnostic scan tool capable of reading manufacturer-specific codes, a multimeter, and possibly an oscilloscope for advanced CAN bus testing.

7. How do I fix the U1159 code?

Repairs may include cleaning or replacing corroded connectors, repairing damaged wiring, updating the module’s software, or replacing the Automatic Sway Bar System Module if it’s faulty.

8. How much does it cost to fix the U1159 code?

Repair costs vary depending on the issue, ranging from $50 for minor wiring repairs to $500 or more if the sway bar module needs replacement.

9. Can a software update resolve the U1159 code?

Yes, in some cases, a software update for the sway bar module or related control modules can clear communication issues and resolve the code.

10. How can I prevent the U1159 code from occurring again?

Regularly inspect the sway bar system’s wiring and connectors for damage or corrosion, and ensure the system is not exposed to excessive dirt, moisture, or impacts during off-road use.

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