Is Your GM Truck or SUV Running Rough?
If your 2003-2007 Silverado, Sierra, Tahoe, or other compatible GM vehicle is suddenly stalling, refusing to start, shifting erratically, or showing a persistent Check Engine Light, the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over 20 years of experience, I’ve seen these exact symptoms hundreds of times. The PCM is the brain of your engine, and when it starts to fail, it can cause a cascade of frustrating and confusing issues that can leave you stranded.
The Direct-Fit, Programmed Solution
This isn’t just a replacement part; it’s a complete solution. We are offering a genuine replacement PCM, service number 12582605, that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means we load the latest, most stable software updates directly from GM before we ship it to you. This critical step ensures the module communicates perfectly with your truck’s engine, transmission, and all other systems, restoring its original performance and efficiency. Forget expensive trips to the dealership for programmingโthis module is ready for installation right out of the box.
Expert Pro Tip: The Post-Install Crankshaft Relearn
After installing your new PCM and reconnecting the battery, your truck may set a P1336 or P0315 code, and the engine might run a little rough. Don’t panic! This is normal. The new PCM needs to learn the specific position of your crankshaft. In my shop, we perform a simple “CASE Relearn” with a scan tool. However, many customers can successfully complete this by driving the vehicle. Accelerate to about 55 MPH and then let the vehicle coast down (do not use the brakes) to below 40 MPH. You may need to repeat this a couple of times. This simple procedure often clears the code and smooths out the engine without needing a special tool.
Common Symptoms of a Failing 2003-2007 Silverado PCM:
- โ Check Engine Light is on with communication-related codes (U-codes) or internal processor fault codes (P0601-P0606).
- โ Complete no-start condition where the engine cranks but won’t fire up.
- โ Unexplained stalling, especially after the engine has warmed up.
- โ Harsh or erratic automatic transmission shifting.
- โ Poor fuel economy and a noticeable loss of power.
- โ Gauges on the instrument cluster behaving erratically or not working at all.
Plug-and-Play Installation: No Dealer Visit Required
You can get your truck back on the road yourself with basic hand tools. Follow these simple steps to replace your old module:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On most of these trucks and SUVs (like the Silverado, Tahoe, and Hummer H2), the PCM is located in the engine bay on the driver’s side, near the battery, inside a black plastic bracket. On some models like the Envoy or SSR, it’s next to the air filter box.
- Disconnect the Harnesses: Carefully lift the gray levers on the electrical connectors to release them from the PCM. Inspect the connectors for any corrosion or bent pins and clean them if necessary.
- Remove the Old Module: Unclip the PCM from its plastic mounting bracket. It should slide right out.
- Install the New PCM: Slide your new, pre-programmed PCM into the bracket and firmly reconnect the wiring harnesses, pushing the levers down to lock them in place.
- Reconnect the Battery: Re-attach the negative battery terminal. The vehicle is now ready to start. You may need to perform the security and crankshaft relearn procedures as described in our pro tip.
Guaranteed Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a massive range of 2003-2007 GM trucks and SUVs, including the Silverado, Sierra (1500, 2500, 3500), Avalanche, Suburban, Tahoe, Yukon, Escalade, Hummer H2, and more. By providing your VIN, you guarantee that we will ship a part that is 100% correct for your specific model, engine, and options.