AutoCodes – Cadillac – B302A Cadillac

B302A Cadillac Code - Mobile Telephone Communications Interface Requested Immobilization

Quick Answer

As part of the vehicle telematics enhanced services, a request may be sent to the Body Control Module (BCM) to disable vehicle starting. Common causes include Contact OnStar. 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: B302A Cadillac indicates Mobile Telephone Communications Interface Requested Immobilization.
Common causes: Common causes include Contact OnStar.
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 1,107

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 02, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B302A Cadillac Description

As part of the vehicle telematics enhanced services, a request may be sent to the Body Control Module (BCM) to disable vehicle starting. If a valid message is received by the BCM requesting that starting be disabled, the start enable message will not be sent to the Engine Control Module (ECM).

OBDII Code B302A Cadillac - Mobile Telephone Communications Interface Requested Immobilization - AutoCodes.com — B302A Cadillac Code - Mobile Telephone Communications Interface Requested Immobilization

What does this mean?

What are the Possible Causes of the DTC B302A Cadillac?

Contact OnStar

How to Fix the DTC B302A Cadillac?

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

1. Verify the OnStar system is not damaged and is operating properly, with no DTCs set. If the OnStar system is damaged, or inoperative, or any OnStar DTCs are set These concerns must be corrected before the start disable can be removed. If the OnStar system is not damaged and is operating properly go step 2.
2. Press the blue OnStar button and ask the advisor to be transferred to the stolen vehicle team to verify the vehicle account has been updated.
3. Verify that OnStar is aware the vehicle has been recovered and that the vehicle account has been updated. If OnStar has not been notified that the vehicle has been recovered Contact the customer and advise them that for security purposes, they must contact OnStar and the law enforcement agency to update the vehicle account. If the account has been properly updated go to step 4.
4. Once the vehicle account has been updated and the start disable request has been removed, DTC B302A will transition to a history DTC. Clear the DTC history.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B302A Cadillac 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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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 B302A Cadillac Code

1. What does the OBDII code B302A mean on a Cadillac?

The B302A code indicates that the Mobile Telephone Communications Interface has requested immobilization, which may involve the vehicle's anti-theft or communication systems.

2. What are the common symptoms of the B302A code?

Symptoms may include the vehicle failing to start, anti-theft warnings on the dashboard, or issues with mobile phone connectivity.

3. What causes the B302A code to appear on a Cadillac?

This code can be caused by a malfunction in the mobile communication system, a faulty anti-theft control module, or a miscommunication between the modules.

4. Can a dead car battery trigger the B302A code?

Yes, a weak or dead battery can disrupt communication between modules and may trigger this code.

5. How can I diagnose the B302A code on my Cadillac?

Use an OBDII scanner to confirm the code, then inspect the communication interface, wiring, and related modules for damage or faulty connections.

6. Can a software update fix the B302A code?

In some cases, a software update for the vehicle's communication or anti-theft system may resolve the issue.

7. Should I check the vehicleâ€™s wiring if I get the B302A code?

Yes, damaged or loose wiring in the communication or immobilizer systems can cause this code and should be inspected.

8. How much does it cost to repair a B302A code on a Cadillac?

Repair costs vary depending on the issue, but diagnosing and fixing module communication problems can range from $150 to $500 or more.

9. Can I drive with the B302A code active?

If the immobilization system is engaged, the vehicle may not start, making it undrivable until the issue is resolved.

10. Do I need to take my Cadillac to a dealership for the B302A code?

While independent mechanics may be able to address the problem, a dealership may have specialized tools and software for diagnosing and repairing communication module issues.