2003-2007 Silverado 3500 PCM | Programmed to Your VIN | 12602802

Is Your GM Truck Running Rough? The PCM Might Be the Culprit.

If you’re dealing with a persistent check engine light, erratic shifting, a no-start condition, or unexplained stalling in your 2003-2007 GM truck or SUV, a failing Powertrain Control Module (PCM) is a very common cause. As the central computer for your engine and transmission, its health is critical. Over years of heat cycles and vibration in the engine bay, these modules can develop internal faults, leading to frustrating and hard-to-diagnose problems.

This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine GM PCM, service number 12602802, and flash it with the latest official GM software calibrated specifically to your vehicle’s 17-digit VIN. This ensures perfect compatibility and restores the performance and reliability you expect from your truck.

Why Choose Our Pre-Programmed 2003-2007 Silverado 3500 PCM?

Getting your truck back on the road shouldn’t be complicated or excessively expensive. Our service is designed to eliminate the biggest hassle of replacing a modern vehicle computer: dealer programming.

• ✔ No Dealer Visit Required: This PCM arrives at your door ready for installation. We handle all the programming before we ship, saving you time and the high cost of a dealership service appointment.
• ✔ Latest GM Software: Your module will be loaded with the most current vehicle calibrations from General Motors, which often include fixes for drivability issues, transmission performance, and emissions that weren’t available when your truck was new.
• ✔ Guaranteed Compatibility: By using your VIN, we ensure the software is a perfect match for your truck’s engine, transmission, and factory options.
• ✔ Solves Common Issues: A direct solution for DTCs (Diagnostic Trouble Codes) related to internal processor failure, communication loss, and erratic sensor readings originating from the PCM.

Simple, Plug-and-Play Installation

Installing your new PCM is a straightforward process that most DIY mechanics can complete in under an hour. While a security relearn procedure is required after installation, it doesn’t require special tools.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
2. Locate the PCM: On most compatible trucks and SUVs (like the Silverado, Sierra, Tahoe, Yukon), the PCM is located in the engine bay on the driver’s side, under or next to the battery tray.
3. Disconnect Connectors: Carefully unclip and swing the locking levers on the wiring harness connectors to release them from the module. There are typically two or three large connectors.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket.
5. Install the New PCM: Mount your new, pre-programmed module in place and secure the bolts.
6. Reconnect Everything: Plug the harness connectors back in firmly and engage the locking levers. Reconnect the negative battery terminal.
7. Perform Security Relearn: You will need to perform the GM VATS/Passlock relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle will not start until this is completed.

Guaranteed Fitment for Your GM Vehicle

This 2003-2007 Silverado 3500 PCM is also the correct direct replacement for a wide range of other GM models that use service number 12602802 or its compatible alternatives like 89017750, 12582605, and 12589463. Key compatible models include:

• Chevrolet: Silverado 1500/2500/3500, Suburban 1500/2500, Tahoe, Avalanche 1500, SSR, Trailblazer EXT
• GMC: Sierra 1500/2500/3500, Sierra Denali, Yukon, Yukon XL 1500/2500, Envoy XL
• Cadillac: Escalade, Escalade ESV, Escalade EXT
• Hummer: H2
• Isuzu: Ascender

After you complete your purchase, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information to perform the necessary programming.