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U12A7 RAM Code - Lost Communication With Display Screen Module

Quick Answer

The U12A7 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with the Display Screen Module (DSM). Common causes include Loose or corroded wiring connections between the DSM and the vehicle's computer, Faulty DSM unit that is not transmitting or receiving signals properly, Damage to the wiring harness leading to the DSM. 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
U12A7 RAM indicates Lost Communication With Display Screen Module.
Common causes
Common causes include Loose or corroded wiring connections between the DSM and the vehicle's computer, Faulty DSM unit that is not transmitting or receiving signals properly, Damage to the wiring harness leading to the DSM.
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 U12A7 RAM Description

The U12A7 diagnostic trouble code (DTC) indicates that the vehicle's onboard computer has lost communication with the Display Screen Module (DSM). The DSM is responsible for controlling and displaying various functions on the vehicle's infotainment system, such as the radio, navigation, and climate control settings. When communication is lost with the DSM, it can lead to a loss of functionality in these systems, affecting the driver's ability to access important information and settings while driving.

OBDII Code U12A7 RAM - Lost Communication With Display Screen Module
U12A7 RAM Code - Lost Communication With Display Screen Module

Common Causes of U12A7 RAM

  1. Loose or corroded wiring connections between the DSM and the vehicle's computer.
  2. Faulty DSM unit that is not transmitting or receiving signals properly.
  3. Damage to the wiring harness leading to the DSM.
  4. Software issues or glitches affecting communication between the DSM and the vehicle's computer.

Symptoms of U12A7 RAM

  1. Inability to access radio, navigation, or climate control settings on the infotainment system.
  2. Blank or frozen display screen on the infotainment system.
  3. Loss of audio output from the radio or media player.
  4. Inability to view important vehicle information or warnings on the display screen.

How to Fix U12A7 RAM

  1. Begin by conducting a visual inspection of the wiring harness and connectors leading to the DSM to check for any visible damage or loose connections.
  2. Use a diagnostic scanner to attempt to establish communication with the DSM and identify any specific error codes or issues.
  3. If necessary, replace any damaged wiring or connectors leading to the DSM to ensure a secure connection.
  4. Test the DSM unit itself to determine if it is functioning correctly and replace it if necessary.
  5. Clear the DTC from the vehicle's computer memory and perform a test drive to confirm that the communication issue has been resolved.

Cost to Fix U12A7 RAM

The typical repair costs for addressing a U12A7 DTC can vary depending on the specific cause of the communication issue and the extent of the repairs needed. In general, the cost of parts for replacing wiring or connectors can range from $50 to $200, while the cost of a new DSM unit can range from $200 to $500 or more. Labor costs for diagnosis and repair can add an additional $100 to $300 or more, depending on the shop's hourly rates and the complexity of the repair. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of your vehicle.

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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 U12A7 RAM Code

1. What are the common symptoms of OBDII code U12A7 RAM Lost Communication With Display Screen Module?

- Common symptoms include the display screen not functioning properly, blank screen, or error messages appearing on the screen.

2. What are the possible causes of the U12A7 code?

- The code can be triggered by issues such as a faulty display screen module, wiring problems, loose connections, or a malfunctioning control module.

3. How can I diagnose the U12A7 code related to lost communication with the display screen module?

- Diagnosing the issue involves checking the wiring connections, inspecting the display screen module, and using a diagnostic scan tool to identify the specific problem.

4. Can I still drive my vehicle with the U12A7 code present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to avoid any potential safety hazards or further damage.

5. How can I repair the U12A7 code related to lost communication with the display screen module?

- Repairing the issue may involve repairing or replacing the display screen module, fixing any wiring problems, ensuring proper connections, or reprogramming the control module.

6. Is it possible to reset the U12A7 code without addressing the underlying issue?

- While resetting the code may temporarily clear the error message, it is important to diagnose and fix the root cause to prevent the code from reoccurring.

7. Can a DIY enthusiast fix the U12A7 code issue at home?

- Depending on your skill level and access to tools, you may be able to address the issue at home by following repair guides or tutorials specific to your vehicle model.

8. How much does it typically cost to repair the U12A7 code related to lost communication with the display screen module?

- Repair costs can vary based on the extent of the issue, parts needed, labor rates, and whether you choose to do the repair yourself or seek professional help.

9. Are there any preventive measures to avoid encountering the U12A7 code in the future?

- Regularly checking and maintaining the display screen module, ensuring proper wiring connections, and addressing any electrical issues promptly can help prevent the code from appearing.

10. Will the U12A7 code cause my vehicle to fail an OBDII emissions test?

- The U12A7 code itself is not directly related to emissions, so it should not cause your vehicle to fail an OBDII emissions test. However, it is still important to address the issue for proper functionality of the display screen module.

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