Is your GMC Sierra, Silverado, or Express van running rough, shifting erratically, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle’s engine and transmission. Don’t let a faulty computer keep your truck off the road. This direct-fit PCM, part number 12589462, is the reliable solution to restore your vehicle’s performance, fuel efficiency, and drivability.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store, each unit we ship is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN). This crucial step ensures that the PCM has the correct factory software and the latest updates from GM, making it a true plug-and-play solution. Simply provide your VIN after purchase, and we’ll handle the programming before it ships, saving you a costly trip to the dealership.
We had a 2006 Silverado 2500 with the 8.1L come in with a complaint of intermittent stalling and a P0300 random misfire code that just wouldn’t go away. The owner had already replaced the spark plugs, wires, and even the crankshaft position sensor. After hours of diagnostics, we traced the issue to the PCM’s ignition coil driver circuit, which was failing intermittently when it got hot. A new, correctly programmed PCM solved the problem instantly. It’s a reminder that sometimes the component controlling everything is the root cause, not the parts it’s controlling.
Common Symptoms of a Failing GM PCM
- ✔ Persistent and unexplained Check Engine Light (CEL)
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Decreased fuel economy
- ✔ Failure to pass emissions testing
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with diagnostic scan tools
The Right Solution for Your 2005-2007 Sierra 2500 PCM
Replacing the PCM on these GM trucks and vans is a critical repair that demands precision. Our service ensures your replacement 2005-2007 Sierra 2500 PCM is ready for installation right out of the box. By flashing the module with your VIN, we ensure all factory-installed options—like engine size, transmission type, and axle ratio—are correctly configured. This module is a direct replacement for part numbers 12589462, 12602801, and 89017749, and fits a wide range of GM vehicles beyond the Sierra, including the Silverado, Suburban, Express, Savana, and more. Please verify the fitment list to confirm compatibility with your specific model and year.
After installation, some vehicles may require a security relearn or a Crankshaft Variation (CASE) relearn procedure. These can often be performed without special tools or by a qualified local mechanic. This ensures the new PCM communicates properly with your vehicle’s anti-theft system and crankshaft position sensor for optimal engine timing and performance.
Frequently Asked Questions
Do I need to program this module?
No. We program the module for you before shipping. You must provide us with your vehicle’s 17-digit VIN after you complete your purchase so we can load the correct GM software for your specific vehicle.
What is a CASE relearn and will I need to do one?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that allows the new PCM to learn the specific position of your engine’s crankshaft. This is sometimes necessary after a PCM replacement to prevent a P0315 trouble code. Many high-end scan tools can perform this, or it can be done by any professional repair shop.
Where is the PCM located on my 2006 Sierra 2500?
On most 2005-2007 classic body style Sierra and Silverado pickups, the PCM is located in the engine bay on the driver’s side, under or near the battery tray. On Express and Savana vans, it’s typically found in the LH rear of the engine compartment.
How do I provide my VIN?
After you place your order, you will receive instructions on how to send us your VIN. You can typically reply to your order confirmation email or use a contact form on our website. We cannot ship your part until we receive the VIN.
Is this compatible with part number 89017749?
Yes, this module is a fully compatible, direct replacement for multiple GM part numbers, including 12589462, 12602801, and 89017749.