AutoCodes – Generic – B1271

B1271 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 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 19,642

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 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 - Theft Protection Active - AutoCodes.com — B1271 Code - Theft Protection Active

What does this mean?

What are the Possible Causes of the DTC B1271?

Reprogram Radio
Faulty Radio

How to Fix the DTC B1271?

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 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 code?

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

Need Help with the Code?

Get the B1271 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1271 Buick — Theft Protection Active
B1271 Cadillac — Theft Protection Active
B1271 Chevrolet — Theft Protection Active
B1271 GMC — Theft Protection Active
B1271 Lexus — Combination Meter ECU Communication Stops
B1271 Scion — Combination Meter ECU Communication Stops
B1271 Toyota — Combination Meter ECU Communication Stops

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 Code

1. What does OBDII code B1271 - Theft Protection Active mean?

When the B1271 code appears, it indicates that the vehicle's theft protection system is currently active.

2. What are common symptoms of OBDII code B1271?

Common symptoms may include the vehicle not starting, the engine cranking but not turning over, and the security light flashing or remaining illuminated on the dashboard.

3. What causes OBDII code B1271 to trigger?

The B1271 code is typically triggered when there is an issue with the vehicle's security system, such as a faulty key fob, a problem with the immobilizer system, or a communication error with the security module.

4. How can I diagnose OBDII code B1271?

Diagnosing the B1271 code often involves checking the key fob battery, verifying the key is properly programmed, inspecting the immobilizer system, and using a scan tool to communicate with the security module.

5. Can I reset OBDII code B1271 on my own?

In some cases, you may be able to reset the B1271 code by disconnecting the vehicle's battery for a few minutes and then reconnecting it. However, addressing the underlying cause of the code is crucial to prevent it from reoccurring.

6. How can I repair OBDII code B1271?

Repairing the B1271 code may involve replacing a faulty key fob, reprogramming the key, repairing the immobilizer system, or addressing any communication issues with the security module. It's recommended to consult a professional mechanic for proper diagnosis and repair.

7. Is it safe to drive with OBDII code B1271 present?

It is not recommended to drive the vehicle with the B1271 code active, as it may lead to starting issues or potential security system malfunctions. It's best to address the problem promptly to ensure the vehicle operates correctly.

8. Can extreme weather conditions trigger OBDII code B1271?

Extreme weather conditions can sometimes impact the performance of the vehicle's security system, potentially triggering the B1271 code. Keeping key fobs protected from harsh weather and ensuring the immobilizer system is functioning properly can help prevent issues.

9. Will disconnecting the car battery reset OBDII code B1271?

Disconnecting the car battery may reset the B1271 code temporarily, but if the underlying issue with the security system is not addressed, the code is likely to reappear. It's important to diagnose and resolve the root cause of the problem.

10. How long does it take to repair OBDII code B1271?

The time needed to repair the B1271 code can vary depending on the specific cause of the issue. Simple fixes like replacing a key fob battery may take a few minutes, while more complex problems with the immobilizer system could require more extensive repairs and diagnostics.