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B1271 Theft Protection Active

OBD2 Code: B1271

Description: Theft protection active.

Definition: This code indicates that the vehicle’s theft deterrent system has been activated. It may be triggered by unauthorized access or tampering with the vehicle, and it typically involves disabling certain functions to prevent theft.

B1271 – Theft Protection Active: Medium severity.

Common Causes

B1271 – Theft Protection Active

Common causes of the B1271 OBD-II trouble code include:

• Issues with the vehicle’s anti-theft system
• Malfunctioning key fob or key transponder
• Faulty ignition switch
• Wiring issues in the theft protection system
• ECU/PCM programming errors related to theft protection

Common Misdiagnosis

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OBD2 Code: B1271

Description: Theft Protection Active

Common Misdiagnosis: Faulty wiring or connections are often misdiagnosed as a problem with the theft deterrent module itself.

Common Diagnostic Steps

OBD2 Code: B1271
Description: Theft Protection Active
Common Diagnostic Steps:

• Verify the theft deterrent system is not active or engaged.
• Check for any additional codes that may indicate a malfunction in the theft deterrent system.
• Inspect the vehicle’s battery and connections to ensure they are secure and providing adequate power.
• Examine key fob functionality, including battery status and signal transmission.
• Test the ignition switch and related wiring for proper operation.
• Review the vehicle’s security module for faults or signs of failure.
• If applicable, reset the theft deterrent system following manufacturer guidelines.