AutoCodes – GMC – B1271 2016 GMC Sierra

B1271 2016 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 2016 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 233

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 2016 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 2016 GMC Sierra - Theft Protection Active - AutoCodes.com — B1271 2016 GMC Sierra Code - Theft Protection Active

What does this mean?

What are the Possible Causes of the DTC B1271 2016 GMC Sierra?

Reprogram Radio
Faulty Radio

How to Fix the DTC B1271 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the B1271 2016 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 2016 GMC Sierra Code

1. What does OBDII code B1271 mean on a 2016 GMC Sierra?

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

2. What are the symptoms of code B1271 in a 2016 GMC Sierra?

Common symptoms include the engine not starting, security warning light illumination, or issues with remote keyless entry.

3. What causes the B1271 code in a 2016 GMC Sierra?

The code can be caused by a faulty theft deterrent module, a malfunctioning ignition switch, damaged wiring, or issues with the key fob or transponder.

4. Can a dead key fob battery trigger the B1271 code?

Yes, a dead or malfunctioning key fob can fail to communicate with the theft deterrent system, potentially triggering the code.

5. How do I reset the B1271 code on a 2016 GMC Sierra?

The code may clear after fixing the issue, but disconnecting the negative battery terminal for a few minutes or using an OBDII scanner can help reset it.

6. Is the B1271 code dangerous to drive with?

The code itself isnâ€™t dangerous, but it may prevent the engine from starting, leaving the vehicle inoperable.

7. How do I fix the B1271 code on a GMC Sierra?

Check the key fob, inspect the theft deterrent module and related wiring, and replace any faulty components. Reprogramming may be necessary.

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

Yes, a malfunctioning ignition switch can fail to properly communicate with the theft deterrent system, causing the code.

9. Do I need to reprogram the key fob if I get the B1271 code?

Reprogramming may be required if the key fob or theft deterrent system communication is compromised.

10. Should I take my 2016 GMC Sierra to a mechanic for the B1271 code?

If basic troubleshooting (like replacing the key fob battery) doesnâ€™t resolve the issue, itâ€™s best to consult a mechanic or dealership with the proper diagnostic tools.