B302A 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 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 Description
How to Fix the DTC B302A?
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 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 Makes
- B302A Buick — Mobile Telephone Communications Interface Requested Immobilization
- B302A Cadillac — Mobile Telephone Communications Interface Requested Immobilization
- B302A Chevrolet — Mobile Telephone Communications Interface Requested Immobilization
- B302A GMC — Mobile Telephone Communications Interface Requested Immobilization
Frequently Asked Questions about B302A Code
1. What does the OBDII code B302A mean?
The B302A code indicates that the mobile telephone communications interface has requested the vehicle's immobilizer system to activate, potentially due to a security or communication issue.
2. What are the symptoms of code B302A?
Symptoms may include the engine failing to start, the immobilizer light staying on, or issues with the vehicle's communication systems.
3. What causes the B302A code?
Common causes include a faulty mobile telephone communications module, wiring issues, software glitches, or a miscommunication between the module and the immobilizer system.
4. Can a dead battery trigger the B302A code?
Yes, a low or dead battery can disrupt communication between the vehicle's systems and cause this code to appear.
5. How is the B302A code diagnosed?
A technician will use a scan tool to check for related codes, inspect the wiring and connections, and test the functionality of the mobile communications module and immobilizer system.
6. Can I drive my car with the B302A code active?
In most cases, the vehicle may not start due to immobilization, so driving is typically not possible until the issue is resolved.
7. Is the B302A code related to the key fob?
While not directly related, issues with the key fob or its programming could potentially cause communication errors, leading to this code.
8. How do I fix the B302A code?
Repairs may involve replacing or reprogramming the mobile communications module, addressing wiring problems, or updating the vehicle's software.
9. Can clearing the B302A code solve the issue?
Clearing the code without addressing the root cause may temporarily remove the error, but the issue is likely to return until proper repairs are made.
10. Is the B302A code a common issue?
This code is less common and is typically seen in vehicles with advanced telematics or mobile communication systems.
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