Is Your GM Truck Acting Up? It Could Be The Brains of the Operation.
If you’re dealing with frustrating issues like a no-start condition, erratic engine performance, harsh shifting, or a persistent check engine light that just won’t go away, the problem might be deeper than a simple sensor. In my 20+ years turning wrenches, I’ve seen these symptoms point directly to a failing Powertrain Control Module (PCM) hundreds of times on these otherwise bulletproof GM trucks and SUVs. The PCM is the central computer for your engine and transmission, and when it fails, it can cause chaos.
The Simple, Reliable Solution: A VIN-Programmed PCM
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. This PCM is the direct, plug-and-play solution you need. We take all the guesswork out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest, most stable GM software specific to your truck. It arrives at your door ready for installation.
- โ VIN Programmed for Your Truck: We handle all the programming before we ship. Itโs ready to install right out of the box.
- โ Latest GM Software Updates: Loaded with the newest factory calibrations to improve performance and reliability.
- โ Solves Common Problems: A direct fix for no-start, poor fuel economy, communication error codes (like P0601), and erratic behavior.
- โ Broad Compatibility: Replaces multiple service numbers for a wide range of GM trucks and SUVs.
Real-World Diagnosis: A Familiar Story
“A customer’s ’05 Tahoe came into my shop last month. It would crank but not start, and when it did, it ran terribly. The dash was lit up with warnings. After checking the basicsโfuel and sparkโmy high-end scan tool couldn’t even communicate with the factory computer. This is a classic sign of internal failure in these PCMs. We installed one of our pre-programmed units, and the truck fired right up and ran perfectly. It’s a repair I’ve done countless times, and it’s almost always the fix.”
Plug-and-Play Installation: Get Back on the Road in Under an Hour
You don’t need to be a master technician to replace your 2003-2007 Sierra 1500 PCM. With basic hand tools, you can do this job in your own driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks (like the Sierra, Silverado, and Tahoe), the PCM is located in the engine bay on the driver’s side, under a plastic cover next to the battery.
- Disconnect the Connectors: Carefully lift the locking tabs and unplug the wiring harness connectors from the old module.
- Swap the Module: Unbolt the old PCM from its bracket and secure the new one in its place.
- Reconnect and Secure: Plug the wiring harnesses firmly into your new PCM until they click into place. Reconnect your battery terminal.
- Final Step: Your vehicle may need to complete a CASE (Crankshaft Angle Sensor Error) relearn procedure. This can often be done with a capable scan tool or by a local mechanic.
Expert Pro Tip: Before plugging in your new PCM, take a moment to inspect the harness connectors. Use a small brush and some electrical contact cleaner to remove any dirt or green corrosion from the pins. A poor connection is a common source of electrical gremlins and can cause issues even with a new part.
Confirming Your Part Number
This module is a direct replacement for multiple GM service numbers. Please verify that your original module has one of the following numbers on its sticker to ensure compatibility:
89017750, 12582605, 12589463, 12602802, 89017734, 28042802
This part is a guaranteed fit for a wide variety of GM vehicles, including the Silverado, Suburban, Escalade, Hummer H2, and more. Please refer to the detailed compatibility list on this page to confirm it fits your specific year, make, and model.