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Engine-Codes – GMC – B1271 2016 GMC Sierra

B1271 2016 GMC Sierra Code - Theft Protection Active

Quick Answer

The B1271 code on a 2016 GMC Sierra indicates that the vehicle's theft protection system is active. Common causes include Faulty key fob or key transponder, Issues with the ignition switch, Faulty anti-theft module. 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 Faulty key fob or key transponder, Issues with the ignition switch, Faulty anti-theft module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B1271 2016 GMC Sierra Description

The B1271 code on a 2016 GMC Sierra indicates that the vehicle's theft protection system is active. This means that the vehicle's anti-theft system has detected a potential threat or unauthorized access, triggering the code. When this code is present, the vehicle may not start or may shut off shortly after starting, as the system is preventing the engine from running to protect against theft.

OBDII Code B1271 2016 GMC Sierra - Theft Protection Active
B1271 2016 GMC Sierra Code - Theft Protection Active

Common Causes of B1271 2016 GMC Sierra

  1. Faulty key fob or key transponder
  2. Issues with the ignition switch
  3. Faulty anti-theft module
  4. Wiring or connection issues in the theft protection system

Symptoms of B1271 2016 GMC Sierra

  1. Vehicle not starting
  2. Engine shutting off shortly after starting
  3. Security light flashing on the dashboard
  4. Inability to turn the ignition key

How to Fix B1271 2016 GMC Sierra

  1. Check the key fob or key transponder for proper programming and functionality.
  2. Inspect the ignition switch for any signs of damage or malfunction.
  3. Test the anti-theft module for proper operation and replace if necessary.
  4. Check the wiring and connections in the theft protection system for any faults or loose connections.
  5. Clear the code from the vehicle's computer system and test to ensure the issue is resolved.

Cost to Fix B1271 2016 GMC Sierra

The cost of repairing the B1271 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. Overall, the total repair cost could range from $200 to $800. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 vehicle’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 isn’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) doesn’t resolve the issue, it’s best to consult a mechanic or dealership with the proper diagnostic tools.

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