AutoCodes – Generic – U1147

U1147 Code - Additional CAN Interior ECU Detected

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Totally Integrated Power Module (TIPM) detects an additional Controller Area Network (CAN) Interior Bus module and requires reprogramming. Common causes include Additional Module Added/Removed From the CAN Interior Bus Network, Faulty Totally Integrated Power Module (TIPM). 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 indicates Additional CAN Interior ECU Detected.
Common causes: Common causes include Additional Module Added/Removed From the CAN Interior Bus Network, Faulty Totally Integrated Power Module (TIPM).
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 22,984

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1147 Description

The Diagnostic Trouble Code (DTC) sets when the Totally Integrated Power Module (TIPM) detects an additional Controller Area Network (CAN) Interior Bus module and requires reprogramming.

OBDII Code U1147 - Additional CAN Interior ECU Detected - AutoCodes.com — U1147 Code - Additional CAN Interior ECU Detected

What does this mean?

What are the Possible Causes of the DTC U1147?

Additional Module Added/Removed From the CAN Interior Bus Network
Faulty Totally Integrated Power Module (TIPM)

How to Fix the DTC U1147?

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 U1147 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 U1147 code?

Need more information on how to fix the U1147 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1147 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1147 Buick — Lost Communication With Onstar
U1147 Cadillac — Lost Communication With Onstar
U1147 Chevrolet — Lost Communication With Onstar
U1147 Chrysler — Additional CAN Interior ECU Detected
U1147 Dodge — Additional CAN Interior ECU Detected
U1147 GMC — Lost Communication With Onstar
U1147 Jeep — Additional CAN Interior ECU Detected
U1147 Pontiac — Lost Communication With Onstar
U1147 RAM — Additional CAN Interior ECU Detected

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 Code

1. What is OBDII code U1147?

Code U1147 stands for "Additional CAN Interior ECU Detected," indicating that there is a communication issue with an interior electronic control unit on the CAN (Controller Area Network) bus.

2. What are common symptoms of OBDII code U1147?

Common symptoms of code U1147 may include dashboard warning lights, loss of certain interior electronic functions, and in some cases, the vehicle may go into limp mode.

3. What can cause OBDII code U1147 to trigger?

Code U1147 can be triggered by issues such as a faulty interior electronic control unit, damaged wiring or connectors in the CAN network, software glitches, or a malfunctioning CAN bus system.

4. How do I diagnose OBDII code U1147?

Diagnosing code U1147 typically involves using a professional OBDII scanner to retrieve the code, checking for any related codes, inspecting the interior electronic control units, and testing the CAN bus network for faults.

5. Can I still drive my vehicle with OBDII code U1147?

It is not recommended to drive your vehicle with code U1147 present, as it can lead to further electrical issues and potentially compromise the safety and performance of the vehicle.

6. How do I repair OBDII code U1147?

Repairing code U1147 may involve addressing the specific cause, such as replacing a faulty interior electronic control unit, repairing damaged wiring or connectors, updating software, or resetting the CAN bus system.

7. Is it possible to clear OBDII code U1147 without fixing the underlying issue?

While you can clear the code temporarily using an OBDII scanner, it is crucial to address the root cause of code U1147 to prevent it from reoccurring and potentially causing more significant problems.

8. Can a DIY enthusiast fix OBDII code U1147 at home?

Depending on the underlying cause, DIY enthusiasts with the necessary tools and knowledge of automotive electronics may be able to diagnose and fix code U1147 at home. However, complex issues may require professional assistance.

9. How much does it cost to repair OBDII code U1147?

The cost of repairing code U1147 can vary significantly based on the specific cause, parts needed, labor rates, and whether you choose to address the issue yourself or seek assistance from a professional mechanic.

10. Is it common for OBDII code U1147 to reoccur after repair?

If the root cause of code U1147 is not adequately addressed or if there are underlying issues within the vehicle's electrical system, there is a possibility that the code may reoccur. Regular maintenance and proper repairs can help prevent this.