2019 - 2025 Chevrolet Blazer Theft Control Module (OEM)

What to Look For

• Make sure the part is the correct type for your car's year, make, and model.
• Check the part for any signs of damage.
• If buying a used part, ask about its history and where it came from.

Quality Indicators

• For used parts: Look for parts that have been tested and inspected. A warranty is a good sign.
• For new aftermarket parts: Choose a reputable brand known for quality.

What's Included

• The theft control module itself.
• Sometimes, instructions may be included (especially with new parts).
• You may need to have the module programmed to your car, which is usually not included.

Difficulty Level and Estimated Time

Replacing a theft control module can be tricky. It's usually considered a medium-difficulty job. It can take anywhere from 1 to 3 hours, depending on your experience.

Special Tools Needed

• Basic hand tools (sockets, wrenches, screwdrivers).
• A scan tool to read and clear trouble codes.
• Possibly a programming tool to program the new module to your car.

Critical Steps and Tips

1. Disconnect the car battery before starting.
2. Locate the theft control module (usually under the dashboard or in the center console).
3. Disconnect the wiring harness from the old module.
4. Remove the old module.
5. Install the new module.
6. Reconnect the wiring harness.
7. Reconnect the car battery.
8. Program the new module to your car (if needed).
9. Clear any trouble codes.

DIY or Professional Installation?

If you're comfortable working on cars and have some experience with electrical systems, you might be able to do it yourself. However, programming the new module often requires special tools and knowledge. If you're not sure, it's best to have a professional install it.

Used OEM

Used OEM (Original Equipment Manufacturer) theft control modules are a great value. These are genuine factory parts that have been tested and inspected. They cost less than new parts.

New Aftermarket

New aftermarket theft control modules are brand new parts made by companies other than the original manufacturer. They are built to meet or exceed the original specifications.

• Ignition Switch: A faulty ignition switch can sometimes cause problems that seem like a theft control module issue.
• Key Fob: Problems with the key fob can also cause security system issues.
• Battery: A weak battery can sometimes cause electrical problems that affect the theft control module.

Replacing these parts at the same time can help prevent future problems. If one part is failing, it can put stress on other parts of the system.

A theft control module can last for many years, often the entire life of the car (10-15 years or more).

Factors That Affect Longevity

• Exposure to moisture or extreme temperatures.
• Electrical problems in the car.
• Accidents or physical damage.
• The quality of the original part.

• Used OEM: $50 - $150
• New Aftermarket: $100 - $300
• Labor Cost: $75 - $200 (if you have a professional install it)
• Total Job Cost: $125 - $500

Some Buick, Cadillac, Chevrolet, and GMC vehicles from 2017-2025 have known issues with their security systems. For example, some models have problems with the security light staying on even after the car is started. There may be Technical Service Bulletins (TSBs) related to these issues. Check with a mechanic or search online for TSBs related to your specific vehicle.

How to Confirm Proper Operation

• Start the car to make sure it starts normally.
• Test the remote keyless entry to make sure it works.
• Make sure the security light on the dashboard turns off after the car starts.

What to Look/Listen For

• No warning lights on the dashboard.
• The car starts and runs normally.
• The remote keyless entry works properly.
• The car alarm doesn't go off for no reason.

Q: Will this theft control module work on my car?
A: This theft control module is designed for certain Buick, Cadillac, Chevrolet, and GMC vehicles from 2017-2025. It's important to make sure it's the correct part for your specific year, make, and model.

Q: Do I need to program this module after I install it?
A: Yes, in most cases, you will need to have the new theft control module programmed to your car. This requires special tools and software.

Q: Can I install this part myself?
A: If you have experience working on cars and are comfortable with electrical systems, you may be able to install it yourself. However, programming the module usually requires a professional.

Q: What if the new module doesn't fix the problem?
A: There could be other issues with your car's security system. A mechanic can help diagnose the problem.

Q: What is the difference between a used OEM and a new aftermarket module?
A: A used OEM module is a genuine factory part that has been tested and inspected. A new aftermarket module is a brand new part made by a third-party company. Both are good options, but used OEM parts are often more affordable.

OEM Part Numbers:

• GM: 13507599, 13523254, 13523277, 13540633, 13585501, 13585502, 13585503, 13585504
• Other: GM 13540633

Fits Years: 2019 2020 2021 2022 2023 2024 2025