B1271 2018 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 2018 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.
Code B1271 2018 GMC Sierra Description
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.
What are the Possible Causes of the DTC B1271 2018 GMC Sierra?
- Reprogram Radio
- Faulty Radio
How to Fix the DTC B1271 2018 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 2018 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 2018 GMC Sierra code?
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Need Help with the Code?
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Frequently Asked Questions about B1271 2018 GMC Sierra Code
1. What does the OBDII code B1271 mean on a 2018 GMC Sierra?
B1271 indicates "Theft Protection Active," meaning the vehicle's theft deterrent system has been triggered or is malfunctioning.
2. What are the common symptoms of code B1271 in a 2018 GMC Sierra?
Symptoms include the vehicle not starting, theft deterrent warning messages on the dash, or the security light staying illuminated.
3. What causes the B1271 code to appear?
This code is typically caused by a faulty theft deterrent module, a malfunction in the ignition switch, issues with the key fob, or damaged wiring in the security system.
4. How can I clear the B1271 code on my GMC Sierra?
Clearing the code requires diagnosing and fixing the underlying issue, then using an OBDII scanner to reset the code. Simply clearing it without repairs may not resolve the issue.
5. Can a dead key fob battery trigger the B1271 code?
Yes, a weak or dead key fob battery can cause communication issues with the theft deterrent system, potentially triggering the B1271 code.
6. How do I troubleshoot the B1271 code on a 2018 GMC Sierra?
Start by checking the key fob battery, inspecting the theft deterrent module and wiring for damage, and scanning the system for related codes to identify the root cause.
7. Is the B1271 code a serious issue?
Yes, as it can prevent the vehicle from starting, leaving you stranded if not addressed promptly.
8. Can the B1271 code be fixed without professional help?
Minor issues like a dead key fob battery or loose wiring might be fixed by a DIYer, but more complex problems with the theft deterrent module may require professional diagnosis and repair.
9. How much does it cost to repair the B1271 code on a GMC Sierra?
The cost varies depending on the issue. Key fob battery replacement is inexpensive, but theft deterrent module replacement or wiring repairs could cost several hundred dollars.
10. Can a remote start system cause the B1271 code?
Yes, aftermarket remote start systems can interfere with the theft deterrent system, potentially causing this code to appear.
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