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Engine-Codes – GMC – B1271 2015 GMC Sierra

B1271 2015 GMC Sierra Code - Theft Protection Active

Quick Answer

The B1271 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the vehicle's theft protection system is active. Common causes include Faulty transponder key or key fob, Malfunctioning immobilizer system, Wiring or communication issues between key and vehicle. 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 Faulty transponder key or key fob, Malfunctioning immobilizer system, Wiring or communication issues between key and vehicle.
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 17, 2024
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Code B1271 2015 GMC Sierra Description

The B1271 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the vehicle's theft protection system is active. This means that the system designed to prevent unauthorized access to the vehicle has been triggered or is malfunctioning. The theft protection system is a crucial component of modern vehicles, as it helps deter theft and protect the vehicle and its contents.

OBDII Code B1271 2015 GMC Sierra - Theft Protection Active
B1271 2015 GMC Sierra Code - Theft Protection Active

Common Causes of B1271 2015 GMC Sierra

  1. Faulty transponder key or key fob
  2. Malfunctioning immobilizer system
  3. Wiring or communication issues between key and vehicle
  4. Faulty theft protection module
  5. Low battery in key fob or vehicle

Symptoms of B1271 2015 GMC Sierra

  1. Vehicle not starting or cranking
  2. Security light illuminated on the dashboard
  3. Engine stalling or shutting off unexpectedly
  4. Inability to use key fob for remote start or keyless entry

How to Fix B1271 2015 GMC Sierra

  1. Check and replace the battery in the key fob.
  2. Verify that the correct key is being used and try a spare key.
  3. Inspect wiring and connections related to the theft protection system.
  4. Reset the theft protection system using the manufacturer's recommended procedure.
  5. Replace the theft protection module if necessary.

Cost to Fix B1271 2015 GMC Sierra

The cost of repairing a B1271 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for this repair can range from $50 to $200, while labor costs can range from $100 to $300. Overall, you can expect to pay anywhere from $150 to $500 for this repair, but it's important to get a detailed estimate from a qualified mechanic before proceeding with the repair. Keep in mind that labor rates can vary based on location, vehicle make and model, and the complexity of the repair.

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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 won’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 doesn’t resolve the issue, it’s recommended to visit a dealership or qualified technician for further diagnosis.

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