Get Your GM Truck Back on the Road, Fast
Is your 2003-2007 GMC Sierra 2500 or other compatible GM truck experiencing frustrating, hard-to-diagnose issues? A failing Powertrain Control Module (PCM), the central computer of your vehicle, is often the hidden culprit behind poor performance, a persistent check engine light, or even a no-start condition. This replacement PCM, part number 12589463, is the reliable, straightforward solution to restore your vehicle’s proper function and your peace of mind.
Unlike sourcing a part from a salvage yard, this module comes professionally programmed to your truck’s specific Vehicle Identification Number (VIN). We install the latest, most stable software updates from General Motors, which can resolve underlying issues that the original factory software may have had. This means no expensive trip to the dealership for programming—it arrives ready for installation and a simple relearn procedure.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I had a 2005 Silverado 2500 in my shop that was giving the owner fits. It would start fine for a week, then suddenly refuse to crank. The battery, starter, and ignition switch all tested perfectly. After hours of chasing wires, I noticed the security light was flashing randomly during the no-start events. A quick scan showed intermittent U0100 (Lost Communication with ECM/PCM) codes. This is a classic sign of an internal PCM failure. The module’s communication processor was failing under certain temperature conditions. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the truck has been starting reliably ever since. It’s a fix I’ve performed hundreds of times on these GM platforms.
Is Your Truck Showing These Symptoms?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is a likely cause:
- âś” Check Engine Light is on with communication-related Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100.
- âś” The engine cranks but will not start.
- âś” Unexplained stalling or rough idling.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Reduced fuel economy for no apparent reason.
- âś” Other modules on the vehicle are not communicating with the PCM.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in under an hour. Our pre-programming service handles the most difficult part for you.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay on the driver’s side, under or next to the battery tray. You may need to remove the battery to access it.
- Disconnect Connectors: Carefully unplug the electrical harness connectors from the old PCM. These connectors have locking tabs that must be released before pulling.
- Swap the Module: Unbolt the old PCM from its mounting bracket and remove it. Secure the new PCM in its place.
- Reconnect Everything: Plug the harness connectors firmly into the new module until they click into place. Reinstall and reconnect the battery.
- Perform Security Relearn: You must perform a simple vehicle anti-theft system (VATS) relearn. Turn the key to the ‘ON’ position for 10-11 minutes, then ‘OFF’ for 30 seconds. Repeat this cycle two more times (for a total of 3 cycles). On the fourth attempt, the vehicle should start and run normally.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM vehicles, including:
- Chevrolet: Avalanche 1500 (03-06), Silverado 1500/2500/3500 (03-07 Classic), SSR (03), Suburban 1500/2500 (03-06), Tahoe (03-06), Trailblazer EXT (03)
- GMC: Sierra 1500/2500/3500 (03-07 Classic), Sierra Denali (03-07 Classic), Yukon (03-06), Yukon XL 1500/2500 (03-06), Envoy XL (03)
- Cadillac: Escalade, ESV, EXT (03-06)
- Hummer: H2 (03-07)
- Isuzu: Ascender (03)
Note: Please verify the specific options for your vehicle in the detailed fitment list or contact us with your VIN to confirm compatibility. For some 2004 models, matching the ID number 12602802 is required.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions to reply with your 17-digit VIN. We cannot ship your order until we receive this information, as the programming is essential for the part to function in your vehicle.
Is this a simple plug-and-play installation?
It is almost plug-and-play. After the physical installation, you must perform a security relearn procedure, which takes about 30 minutes and involves cycling the ignition key. This procedure links the new PCM to your vehicle’s anti-theft system and does not require any special tools. Instructions are included.
Will this fix my specific problem?
This PCM will correct issues directly caused by a failing engine computer. While symptoms like a no-start or check engine light are common indicators, we always recommend proper diagnostics to confirm the PCM is the point of failure before ordering.
What if my original part number isn’t 12589463?
This module replaces several service numbers, including 89017750, 12582605, 12602802, and others. As long as your vehicle is on our compatibility list and your old module has one of the listed service numbers, this part will work correctly once programmed to your VIN.
Do I need to have a Crankshaft Variation (CASE) Relearn performed?
For optimal performance and to prevent a P1336 trouble code, a CASE relearn is recommended. While the vehicle will run without it after the security relearn, most professional scan tools can perform this final procedure in a few minutes to sync the crankshaft position sensor to the new PCM.