B302A GMC 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 GMC 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.
Code B302A GMC Description
How to Fix the DTC B302A 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.
Code Tech Notes
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 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.
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Information for Specific GMC Models
- B302A 2014 GMC Sierra — Mobile Telephone Communications Interface Requested Immobilization
- B302A 2015 GMC Sierra — Mobile Telephone Communications Interface Requested Immobilization
- B302A 2016 GMC Sierra — Mobile Telephone Communications Interface Requested Immobilization
- B302A 2017 GMC Sierra — Mobile Telephone Communications Interface Requested Immobilization
- B302A 2018 GMC Sierra — Mobile Telephone Communications Interface Requested Immobilization
Frequently Asked Questions about B302A GMC Code
1. What does the OBDII code B302A mean on a GMC?
The B302A code indicates that the Mobile Telephone Communications Interface has requested the vehicle's immobilizer system to activate, likely due to a security or communication-related issue.
2. What are the common symptoms of code B302A in a GMC?
Symptoms may include the vehicle failing to start, the immobilizer warning light being illuminated, and potential communication errors with the mobile communication module.
3. What causes the B302A code on a GMC vehicle?
Possible causes include software or communication issues in the mobile telephone module, a faulty immobilizer system, wiring problems, or incorrect configuration of the telematics system.
4. Can a weak battery trigger the B302A code in a GMC?
Yes, a weak or failing vehicle battery can disrupt communication between modules, potentially causing the B302A code.
5. How do you diagnose the B302A code in a GMC vehicle?
Diagnosis involves using a scan tool to check for related codes, inspecting the wiring and connections of the mobile communication and immobilizer systems, and verifying the functionality of the telematics control module.
6. How can you fix the B302A code on a GMC?
Repairs may include reprogramming or updating the software for the telematics module, repairing or replacing damaged wiring, or addressing issues with the immobilizer system.
7. Is the B302A code a serious issue in a GMC?
Yes, it can be serious, as it may prevent the vehicle from starting. Prompt diagnosis and repair are recommended to avoid further complications.
8. Can a malfunctioning telematics module cause the B302A code?
Yes, a faulty or misconfigured telematics module can send an incorrect immobilization request, triggering the B302A code.
9. Is it safe to drive a GMC with the B302A code?
If the vehicle starts and runs, it might be safe to drive temporarily, but the issue should be addressed quickly to avoid potential immobilization.
10. Will clearing the B302A code fix the problem?
Clearing the code may temporarily reset it, but the underlying issue must be resolved to prevent the code from returning.
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