AutoCodes – GMC – B1271 2015 GMC Sierra

B1271 2015 GMC Sierra Code - Theft Protection Active

Quick Answer

When the radio is initially installed in the vehicle, the radio receives Vehicle Identification Number (VIN) information via serial data. Common causes include Reprogram Radio, Faulty Radio. 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: B1271 2015 GMC Sierra indicates Theft Protection Active.
Common causes: Common causes include Reprogram Radio, Faulty Radio.
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 192

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 14, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1271 2015 GMC Sierra Description

When the radio is initially installed in the vehicle, the radio receives Vehicle Identification Number (VIN) information via serial data. The radio stores a portion of the VIN and compares this sequence to the VIN information received each time the radio powers on. The VIN in the radio is a single one-time learn.
The radio theft deterrent system is intended to disable or limit radio functionality if incorrect vehicle information is received by radio. The radio disables functionality if the VIN information received by the radio does not match the VIN information that has been learned by the radio. This Diagnostic Trouble Code (DTC) is generated by the module when the Theft Protection is activated.
The DTC will be set when the radio receives the correct VIN information via serial data.

OBDII Code B1271 2015 GMC Sierra - Theft Protection Active - AutoCodes.com — B1271 2015 GMC Sierra Code - Theft Protection Active

What does this mean?

What are the Possible Causes of the DTC B1271 2015 GMC Sierra?

Reprogram Radio
Faulty Radio

How to Fix the DTC B1271 2015 GMC Sierra?

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 B1271 2015 GMC Sierra 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 B1271 2015 GMC Sierra code?

Need more information on how to fix the B1271 2015 GMC Sierra code? Get Access to Factory Service Manuals

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 B1271 2015 GMC Sierra Code

1. What does the OBDII code B1271 mean on a 2015 GMC Sierra?

B1271 indicates "Theft Protection Active," meaning the vehicle's theft deterrent system has been triggered or is malfunctioning.

2. What are common symptoms of the B1271 code in a GMC Sierra?

Symptoms may include the vehicle not starting, the security light staying on or flashing, and possible issues with unlocking or locking the doors.

3. What causes the B1271 code on a 2015 GMC Sierra?

Common causes include a malfunctioning theft deterrent module, a faulty key fob, damaged wiring, or issues with the ignition switch.

4. Can I still drive my GMC Sierra with the B1271 code active?

In most cases, the vehicle wonâ€™t start when this code is active, as the theft deterrent system prevents the engine from running.

5. How can I fix the B1271 code on my GMC Sierra?

Start by checking the key fob battery, inspecting the theft deterrent system wiring, and performing a relearn procedure for the passlock or key. If unresolved, consult a professional.

6. How do I reset the theft deterrent system on a 2015 GMC Sierra?

To reset the system, turn the ignition to "ON" for about 10 minutes until the security light turns off, then attempt to start the vehicle.

7. Could a dead key fob battery trigger the B1271 code?

Yes, a dead or weak key fob battery can prevent communication with the theft deterrent system, triggering the code.

8. Does a faulty ignition switch cause the B1271 code?

Yes, a faulty ignition switch can disrupt the signal to the theft deterrent system, leading to the activation of the code.

9. How much does it cost to repair the B1271 code on a GMC Sierra?

Repair costs vary but could range from $50 for a new key fob battery to $200-$500 for more extensive repairs like replacing the theft deterrent module.

10. Should I take my GMC Sierra to a dealership for the B1271 code?

If basic troubleshooting like replacing the key fob battery or resetting the system doesnâ€™t resolve the issue, itâ€™s recommended to visit a dealership or qualified technician for further diagnosis.