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GM Vehicles: What to Do When the Immobilizer Light Stays On After Key Programming
This guide will take you through the process and troubleshoot common issues, such as what to do if the immobilizer light stays on after programming.
GM is a massive umbrella with several sub-brands, including:
Chevrolet
GMC
Buick
Cadillac
Hummer
Pontiac (discontinued but still on the road)
Saturn (discontinued but still on the road)
Oldsmobile (discontinued but still on the road)
Troubleshooting: What to Do if the Immobilizer Light Stays On
The immobilizer light staying on after programming is a common issue and indicates that the vehicle’s anti-theft system hasn’t fully recognized the new key. Here’s how to troubleshoot:
1. Try Pulling the Negative Battery Cable Off for 5 Minutes
This is a common reset method for many vehicles. Disconnecting the negative battery cable can reset the vehicle’s computer system, including the immobilizer.
2. Re-read the PIN
Sometimes, reading the PIN again from the immobilizer system can solve the issue. This is particularly useful if there was a miscommunication between the key and the immobilizer during the initial programming attempt.
3. Ensure You Have Programmed Two Keys (If Required)
Some GM vehicles require two keys to be programmed when all keys are lost. If you only program one, the system might not fully recognize the new key, leaving the immobilizer light on.
4. Scan the Vehicle for Codes and Diagnose Further
If the immobilizer light is still on after trying the above methods, the issue might be more complex. At this point, it’s essential to use a diagnostic scan tool to read any trouble codes from the vehicle’s computer.
Conclusion
Programming keys for Chevrolet and other GM vehicles is generally a straightforward process, but like with any technical procedure, issues such as the immobilizer light staying on can arise. By following these steps and troubleshooting tips, you can often resolve the problem and complete the programming successfully.
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