Restore Your Truck’s Brain and Drivability
Is your GMC Sierra or Chevy Silverado running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience under the hood, I’ve seen these symptoms countless times. Often, the culprit isn’t a mechanical part but the vehicle’s central computer: the Powertrain Control Module (PCM). This isn’t just a part; it’s the brain of your truck’s engine and transmission, and when it fails, it can cause a cascade of frustrating and hard-to-diagnose problems.
This replacement PCM, part number 89017749, is the definitive solution. We take the guesswork and hassle out of the repair by professionally programming the module to your truck’s specific Vehicle Identification Number (VIN) before it ever leaves our facility. This ensures it has the latest GM software updates and is ready for a straightforward installation, saving you a costly trip to the dealership for programming.
A Technician’s Notebook: The Intermittent Stall
I once had a 2006 Silverado 2500 with the 8.1L engine in my bay that was driving its owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. No consistent codes were stored, just a few random communication faults. After checking all the usual suspects—fuel pressure, crank sensor, wiring—I focused on the PCM. On these trucks, heat and vibration can cause internal solder joints in the module to fail intermittently. We swapped in a pre-programmed PCM, and the problem vanished instantly. It’s a classic failure mode that a simple part swap can’t always fix without the proper programming, which is why this all-in-one solution is so effective.
Is Your Truck Showing These Symptoms?
- ✔ Check Engine Light (CEL) is on with codes like P0601, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Rough or erratic idling and stalling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
Replacing the 2005-2007 Sierra 2500 PCM is a job most DIYers can handle with basic tools. The module is typically located in the engine bay on the driver’s side, under or near the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system capacitors to discharge.
- Locate the PCM: On most Sierra/Silverado models, you will need to remove the battery and potentially the battery tray to access the PCM. It’s a silver box with several large electrical connectors.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. They are often color-coded or keyed, so they can only go back in one way. Avoid forcing them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM in place and securely fasten the bolts.
- Reconnect Everything: Plug the harness connectors firmly into the new module. Reinstall the battery tray and battery, then reconnect the negative battery terminal.
- Perform Security Relearn (If Needed): In most cases, you will need to perform a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. We include instructions for this easy process.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part numbers 89017749, 12589462, and 12602801. It is guaranteed to fit the following vehicles (please verify your specific options):
- GMC Sierra / Chevy Silverado 1500, 2500, 3500 (2005-2007 Classic): Fits gasoline models including 4.3L and 8.1L engines.
- GMC Savana / Chevy Express 1500, 2500, 3500 (2005-2007): Fits gasoline engine vans.
- GMC Yukon XL 2500 / Chevy Suburban 2500 (2005-2006): Fits 8.1L models.
- Chevy Avalanche 2500 (2005-2006)
- GMC Safari / Chevy Astro (2005)
- Chevy Blazer S10 / GMC Jimmy S15 (2005)
- Cadillac CTS-V (2004-2005)
Choosing this pre-programmed 2005-2007 Sierra 2500 PCM is the most reliable and efficient way to get your truck back on the road, running as it should.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. We use it to load the exact, correct factory software and calibrations for your truck’s specific engine, transmission, and emissions equipment. This ensures perfect compatibility and performance.
Is this part difficult to install?
No, this is a plug-and-play part. The physical installation is straightforward for anyone with basic mechanical skills. The only additional step is a simple security relearn procedure, which we provide clear instructions for.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both the engine and the transmission. If the module is faulty, it can send incorrect signals to the transmission, causing harsh shifts, slipping, or failure to shift. A new, correctly programmed PCM often resolves these issues.
What if my original part number is different?
This module is a direct replacement for several part numbers, including 12589462 and 12602801. GM often consolidates part numbers over time. As long as your vehicle is on our compatibility list, this module will function correctly.