AutoCodes – Generic – B2476:04

B2476:04 Code - Cellular Phone Select Service Switch Open

Quick Answer

The OnStar® button assembly consists of 3 buttons: Call/Answer, OnStar® Call Center, and OnStar® Emergency. Common causes include Faulty Inside Rearview Mirror, Inside Rearview Mirror harness is open or shorted, Inside Rearview Mirror 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: B2476:04 indicates Cellular Phone Select Service Switch Open.
Common causes: Common causes include Faulty Inside Rearview Mirror, Inside Rearview Mirror harness is open or shorted, Inside Rearview Mirror 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 469

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 May 01, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B2476:04 Description

The OnStar® button assembly consists of 3 buttons: Call/Answer, OnStar® Call Center, and OnStar® Emergency. The Telematics Communication Interface Control Module supplies the OnStar® button assembly with 10 V via the 10 V reference circuit. When pressed, each button completes the circuit across a resistor or set of resistors allowing a specific voltage to be returned to the Telematics Communication Interface Control Module over the signal circuit. Depending upon the voltage range returned, the Telematics Communication Interface Control Module is able to identify which button has been pressed. The Diagnostic Trouble Code (DTC) will be set when the Telematics Communication Interface Control Module detects a short to voltage or an open/high resistance on the 10 V reference circuit.

OBDII Code B2476:04 - Cellular Phone Select Service Switch Open - AutoCodes.com — B2476:04 Code - Cellular Phone Select Service Switch Open

What does this mean?

What are the Possible Causes of the DTC B2476:04?

Faulty Inside Rearview Mirror
Inside Rearview Mirror harness is open or shorted
Inside Rearview Mirror circuit poor electrical connection
Faulty Telematics Communication Interface Control Module

How to Fix the DTC B2476:04?

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 does this mean?

Code Tech Notes

B2476:04 Cellular Phone Select Service Switch Open
B2476:59 Cellular Phone Select Service Switch Protection Time-out

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2476:04 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.

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Need Help with the Code?

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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 B2476:04 Code

1. What does the OBDII code B2476:04 mean?

The code B2476:04 indicates an issue with the Cellular Phone Select Service Switch, specifically an "open" circuit condition.

2. What are the symptoms of code B2476:04?

Common symptoms include the inability to connect to cellular services, failure of hands-free phone functionality, and possible warning messages on the infotainment screen.

3. What causes the B2476:04 code to appear?

Causes may include a faulty cellular service switch, damaged wiring or connectors, or a malfunction in the infotainment system.

4. Can a loose connection trigger code B2476:04?

Yes, a loose or corroded connection in the wiring to the cellular service switch can trigger this code.

5. How do you diagnose the B2476:04 code?

Diagnosis involves checking the service switch for continuity, inspecting wiring and connectors for damage, and scanning the system for additional related codes.

6. Is the B2476:04 code serious?

While it doesn't impact vehicle drivability, it can disable cellular phone integration, which may inconvenience users relying on hands-free functionality.

7. How can I fix the B2476:04 code?

Repair options include replacing a faulty service switch, repairing or replacing damaged wiring, or reprogramming the infotainment system if needed.

8. Can I clear the B2476:04 code without repairs?

Clearing the code without addressing the underlying issue will likely result in the code returning after a short period.

9. Is a software update a possible solution for code B2476:04?

In some cases, a software update to the infotainment or communication module may resolve the issue if it's related to software bugs.

10. Can I drive my car with the B2476:04 code active?

Yes, you can drive the car, but cellular phone functionality may be impaired until the issue is resolved.

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