AutoCodes – GMC – B1446 GMC

B1446 GMC Code - Replace Backup Power Source

Quick Answer

The Back-up Battery (BUB) provides voltage to the Communication Interface Module (CIM), to be able to successfully place a call in the event of a main battery disconnect during a collision event. Common causes include Faulty Communication Interface Module (CIM), Communication Interface Module (CIM) harness is open or shorted, Communication Interface Module (CIM) 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: B1446 GMC indicates Replace Backup Power Source.
Common causes: Common causes include Faulty Communication Interface Module (CIM), Communication Interface Module (CIM) harness is open or shorted, Communication Interface Module (CIM) 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 1,450

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 10, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1446 GMC Description

OBDII Code B1446 GMC - Replace Backup Power Source - AutoCodes.com — B1446 GMC Code - Replace Backup Power Source

What does this mean?

What are the Possible Causes of the DTC B1446 GMC?

Faulty Communication Interface Module (CIM)
Communication Interface Module (CIM) harness is open or shorted
Communication Interface Module (CIM) circuit poor electrical connection

How to Fix the DTC B1446 GMC?

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 B1446 GMC 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 B1446 GMC code?

Need more information on how to fix the B1446 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1446 GMC code diagnosed by a professional: Find a repair shop in your area

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 B1446 GMC Code

1. What does OBDII code B1446 for GMC mean?

- OBDII code B1446 for GMC refers to an issue with the backup power source that may affect the vehicle's systems.

2. What are the common symptoms of OBDII code B1446?

- Common symptoms of OBDII code B1446 include difficulty starting the vehicle, dim or flickering interior lights, and electronics not functioning properly.

3. What can cause OBDII code B1446 to trigger?

- OBDII code B1446 can be triggered by a faulty backup power source, such as a failing battery or issues with the electrical system.

4. How do I diagnose the cause of OBDII code B1446?

- To diagnose OBDII code B1446, it is recommended to check the battery health, inspect the electrical connections, and perform a thorough scan of the vehicle's systems.

5. How serious is OBDII code B1446?

- OBDII code B1446 can lead to potential issues with starting the vehicle and operating electronic components, so it is important to address this code promptly.

6. Can I still drive my vehicle with OBDII code B1446?

- It is not recommended to drive your vehicle with OBDII code B1446, as it may lead to operational issues and potential breakdowns.

7. How can I repair OBDII code B1446?

- Repairing OBDII code B1446 typically involves replacing the backup power source, such as the battery, and ensuring the electrical system is functioning properly.

8. Are there any DIY tips for fixing OBDII code B1446?

- While some may attempt to replace the battery themselves, it is recommended to seek professional help to properly diagnose and repair OBDII code B1446.

9. How much does it cost to fix OBDII code B1446?

- The cost to fix OBDII code B1446 can vary depending on the underlying cause, but it may involve replacing the battery and addressing any electrical issues, which could range from a few hundred to over a thousand dollars.

10. Can OBDII code B1446 be prevented?

- Regular maintenance of the vehicle's battery and electrical system can help prevent issues that may trigger OBDII code B1446, such as ensuring proper charging and conducting routine inspections.