Is Your 2005 Blazer S10 Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central computer of your 2005 Chevrolet Blazer S10 or GMC Jimmy S15. It’s responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When this critical component begins to fail, it can cause a wide range of frustrating and often confusing symptoms. From a persistent Check Engine Light to a vehicle that won’t start at all, a faulty PCM can bring your trusty truck to a standstill. This replacement module, part number 89017749, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Poor fuel economy and a noticeable loss of engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle cranks but refuses to start (no-start condition).
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Critical Importance of VIN Programming
Simply installing a used or non-programmed module from another vehicle will not work. Modern vehicles like your Blazer S10 have sophisticated anti-theft systems (Passlock/VATS) and specific calibrations for the engine, transmission, and even tire size. Our service eliminates the guesswork and the need for an expensive trip to the dealership. When you purchase this 2005 Blazer S10 PCM, we will flash it with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures that the module is a perfect match for your vehicle’s specific configuration, making the installation process as simple as plug-and-play.
After installation, your vehicle will recognize the new module, and all systems will function as intended from the factory. This is the most reliable and efficient way to get your truck back on the road without the hassle of additional programming or key relearn procedures at a repair shop.
Guaranteed Fitment and Compatibility
This Electronic Control Module is a direct replacement for multiple GM part numbers, including 12589462, 12602801, and 89017749. It is guaranteed to fit and function in the following vehicles:
- ASTRO 05 Electronic Control Module; (LH front by battery)
- AVALANCHE 2500 05-06 Electronic Control Module; (LH front under battery)
- BLAZER S10/JIMMY S15 05 Electronic Control Module; (RH front engine compartment)
- CTS 04-05 Electronic Control Module; (RH engine compartment), V-Series
- EXPRESS/SAVANA 1500 VAN 05-07 Electronic Control Module; (LH rear engine compartment)
- EXPRESS/SAVANA 2500 VAN 05-07 Electronic Control Module; gasoline, (LH rear engine compartment)
- EXPRESS/SAVANA 3500 VAN 05-07 Electronic Control Module; gasoline, (LH rear engine compartment)
- SAFARI (GMC) 05 Electronic Control Module; (LH front by battery)
- SIERRA/SILVERADO 1500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), w/4.3L
- SIERRA/SILVERADO 2500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SIERRA/SILVERADO 3500 PICKUP 05-07 (Classic Style) Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
- YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
Please verify the location and engine options match your specific vehicle. If you have any questions about fitment, please contact us with your VIN before ordering.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
No. Because we program the module to your vehicle’s VIN before shipping, it is ready for installation right out of the box. In most cases, no additional programming or key relearn procedures are necessary. Just disconnect the battery, swap the module, and reconnect the battery.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a plate on the driver’s side dashboard visible through the windshield.
How do I provide my VIN after purchase?
After you complete your purchase, you can send us a message with your VIN. We cannot ship your order until we receive this information, as the programming is a required step.
Is this a new or used part?
This is a high-quality, tested, and inspected original equipment part that has been professionally programmed with the latest GM software for your vehicle.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, this part will resolve the issue. However, it’s always recommended to have your vehicle properly diagnosed to ensure the PCM is the root cause of the problem and not a separate sensor or wiring issue.