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U1147 RAM Code - Additional CAN Interior ECU Detected

Quick Answer

The U1147 diagnostic trouble code (DTC) indicates that an additional Controller Area Network (CAN) Interior Electronic Control Unit (ECU) has been detected in the vehicle's network. Common causes include Faulty ECU causing improper communication, Wiring issues such as shorts or open circuits, Software glitch leading to the detection of an additional ECU. 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
U1147 RAM indicates Additional CAN Interior ECU Detected.
Common causes
Common causes include Faulty ECU causing improper communication, Wiring issues such as shorts or open circuits, Software glitch leading to the detection of an additional ECU.
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 08, 2024
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Code U1147 RAM Description

The U1147 diagnostic trouble code (DTC) indicates that an additional Controller Area Network (CAN) Interior Electronic Control Unit (ECU) has been detected in the vehicle's network. The CAN bus system is a communication network that allows various ECUs in a vehicle to communicate with each other. When this code appears, it means that there is an extra ECU present on the network that should not be there, which can lead to communication issues and potentially affect the vehicle's performance.

OBDII Code U1147 RAM - Additional CAN Interior ECU Detected
U1147 RAM Code - Additional CAN Interior ECU Detected

Common Causes of U1147 RAM

  1. Faulty ECU causing improper communication.
  2. Wiring issues such as shorts or open circuits.
  3. Software glitch leading to the detection of an additional ECU.
  4. Aftermarket modifications interfering with the vehicle's network.
  5. Water damage or corrosion affecting the network connections.

Symptoms of U1147 RAM

  1. Erratic behavior in interior systems such as climate control or audio system.
  2. Malfunctioning interior lighting.
  3. Issues with the vehicle's security system.
  4. Warning lights illuminated on the instrument cluster.
  5. Inconsistent communication between ECUs.

How to Fix U1147 RAM

  1. Begin by performing a thorough diagnostic scan to identify the exact ECU causing the issue.
  2. Inspect the wiring harness for any signs of damage or corrosion and repair as necessary.
  3. Check for any aftermarket modifications that may be interfering with the vehicle's network and remove if needed.
  4. Verify software updates for the affected ECUs and reprogram as required.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U1147 RAM

The typical repair costs for addressing a U1147 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it's essential to note that rates at auto repair shops can vary based on location, vehicle make and model, and engine type. Additionally, diagnosis time and labor rates can also influence the final cost of the repair. It's advisable to contact local auto repair shops for a more accurate estimate based on the specific circumstances of the 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 U1147 RAM Code

1. What does the OBDII code U1147 mean on a RAM vehicle?

The U1147 code indicates that an additional CAN Interior ECU (Electronic Control Unit) has been detected, which may interfere with normal communication between modules on the vehicle's CAN bus.

2. What are the common symptoms of the U1147 code in a RAM vehicle?

Symptoms may include warning lights on the dashboard, erratic behavior of interior electronic systems, or loss of communication with certain modules.

3. What causes the U1147 code to appear in a RAM vehicle?

The code can be triggered by an unapproved aftermarket module, a faulty ECU, wiring issues, or software inconsistencies in the CAN bus communication system.

4. Can an aftermarket accessory cause the U1147 code in a RAM vehicle?

Yes, aftermarket accessories like remote starters or custom infotainment systems can interfere with the CAN communication network and trigger this code.

5. How do you diagnose the U1147 code in a RAM vehicle?

Diagnosis involves scanning for additional codes, inspecting the CAN bus wiring and connections, and identifying any non-factory modules installed in the vehicle.

6. Is the U1147 code serious, and can I still drive with it?

While the vehicle may still be drivable, the code can lead to improper functioning of critical systems. It is best to address the issue promptly to avoid potential safety concerns.

7. How is the U1147 code fixed in a RAM vehicle?

Repairs may involve removing unauthorized aftermarket modules, updating ECU software, repairing damaged wiring, or replacing a faulty ECU.

8. Can a dead or weak battery trigger the U1147 code?

Yes, a weak or dead battery can cause communication errors on the CAN bus, leading to this code. Testing and replacing the battery may resolve the issue.

9. What tools are needed to troubleshoot the U1147 code in a RAM vehicle?

A professional OBDII scanner with CAN bus diagnostics, a multimeter, and wiring diagrams are essential for diagnosing and fixing the code.

10. Will clearing the U1147 code with a scan tool permanently fix the issue?

Clearing the code may temporarily remove it, but if the underlying issue is not resolved, the code will likely return. Proper diagnosis and repair are necessary.

Discuss the causes and fixes for U1147 RAM OBDII Code

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  • I don't take my vehicle to anyone to fix. There is nothing in it that I am unable to repair and this information isn't enough. I would like to know what needs to be reprogrammed in the TIPM so I can get this program or write it and then reprogram it. Seriously, the dealerships can't be trusted and I have personally experienced why several times. I can't trust any of the mechanics shops because if they do average or even marginally okay work, they will charge thousands and it's not worth that. Plus, this vehicle really isn't that complex that only a mechanic that has a job at a dirty garage can fix it. If they can do it, so can I. That's coming from a Navy veteran and college graduate that worked on military aircraft electronics. I promise, the aircraft are far more complex than this truck. If anything, the truck is more difficult because there is so much bogus information floating around the internet.

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