Restore Peak Performance to Your GM Truck or SUV
Is your Chevrolet Silverado, GMC Sierra, or Cadillac Escalade suffering from frustrating issues like stalling, rough idling, poor fuel economy, or an illuminated Check Engine Light? These are common indicators of a failing Powertrain Control Module (PCM), the central computer responsible for managing your vehicle’s engine and transmission. Don’t let a faulty module keep you off the road. This direct-fit replacement PCM, part number 12602802, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We had a 2005 Silverado 1500 come into the shop with a persistent P0300 random misfire code. The owner had already replaced the spark plugs, wires, and even the coil packs, but the problem wouldn’t go away. The engine ran rough, especially under load. After hooking up our diagnostic scanner and monitoring live data, we noticed erratic signals from multiple sensors. Instead of continuing to chase individual components, we checked the PCM’s power and ground circuits, which were solid. This pointed directly to an internal failure of the module itself. After installing a VIN-programmed PCM like this one, the truck ran perfectly. It’s a classic case where the “brain” was the issue, not the parts it was controlling.
Why Choose a VIN-Programmed Module?
The biggest challenge when replacing a modern vehicle’s computer is programming. A module from a salvage yard or a generic part won’t work correctly without being specifically coded to your vehicle. Our process eliminates that headache. When you order this GM PCM 12602802, we flash it with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures that the module communicates flawlessly with your truck’s specific engine, transmission, and options package. It’s a true plug-and-play solution that saves you a costly trip to the dealership.
Common Symptoms of a Failing GM Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or erratic idling
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or incorrect transmission shifting
- ✔ Failure to pass emissions testing
- ✔ No-start condition where the engine cranks but won’t fire
Installation Guide for Your GM PCM 12602802
Installation is straightforward for the DIY mechanic. The PCM is typically located in the engine bay on the driver’s side, near the battery or air filter box. After disconnecting the vehicle’s battery, simply unplug the electrical connectors from the old module, unbolt it from its bracket, and install the new one in its place. Once everything is reconnected, you will need to perform a simple security relearn procedure (often called a CASE relearn or anti-theft relearn), which allows the new PCM to recognize your vehicle’s keys. This procedure typically involves turning the key to the “ON” position for 10-15 minutes, then off, and repeating two more times. Your vehicle’s service manual will have the exact steps.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 89017734, and 28042802, ensuring broad compatibility across dozens of GM models from 2003 to 2007.
Frequently Asked Questions
Do I need to have this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and the module will arrive ready for installation.
Where is the PCM located on my truck?
On most compatible GM trucks and SUVs like the Silverado, Tahoe, and Yukon, the PCM is found under the hood on the driver’s side, mounted near the battery tray or the air intake box.
What is the security relearn procedure?
This is a simple, required step that syncs the new PCM with your vehicle’s anti-theft system. It typically involves a sequence of turning the ignition key on and off for set periods of time. No special tools are needed, and instructions are readily available online or in your owner’s manual.
How do I know if this part will fit my vehicle?
This PCM fits a wide range of 2003-2007 GM trucks and SUVs. The best way to confirm is to match the part number (12602802) or one of the compatible service numbers listed on your original module. You can also send us your VIN, and we will verify compatibility for you.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can send incorrect signals to the transmission, causing harsh or erratic shifting. Replacing a faulty PCM often resolves these types of electronic transmission issues.