Restore Peak Performance to Your GM Truck or SUV
Is your Hummer H2, Silverado, Sierra, or Tahoe suffering from baffling engine issues, erratic shifting, or a persistent check engine light? The Powertrain Control Module (PCM) is the central computer of your vehicle, orchestrating everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. This direct-fit replacement PCM, part number 12602802, is the definitive solution to restore your vehicle’s reliability and drivability.
The Plug-and-Play Solution for a Complex Problem
Don’t waste time and money at a dealership on expensive diagnostics and programming fees. We take the guesswork out of the repair. When you purchase this module, we flash it with the latest official GM software updates specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once you receive the part, it’s ready for installation right out of the box. It’s a simple, effective way to get your truck back to factory-spec operation without needing specialized tools or a trip to the service bay for programming.
From the Diagnostic Bay
We once had a 2006 Sierra 2500 in the shop that was driving the owner crazy. It had a random, intermittent misfire on cylinder 3 that would come and go. The owner had already replaced the spark plug, ignition coil, and even the fuel injector, but the problem persisted. After hours of chasing wires, we finally hooked up a lab scope to the ignition control signal from the PCM. We found the signal would drop out intermittently. The driver circuit inside the original PCM was failing. We installed a VIN-programmed module just like this one, and the truck ran perfectly. It’s a classic case where the root cause is the computer, not the components it controls.
Common Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light: Your check engine light is illuminated, often with communication-related fault codes (U-codes) or specific sensor circuit codes.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode).
- ✔ Poor Engine Performance: You may experience stalling, rough idling, hesitation during acceleration, or a noticeable loss of power.
- ✔ No-Start Condition: The engine cranks over but refuses to start, which can be caused by the PCM not firing the ignition coils or fuel injectors.
- ✔ Reduced Fuel Economy: A faulty PCM can’t efficiently manage the engine’s fuel-to-air ratio, leading to a significant drop in MPG.
- ✔ Failed Emissions Test: Incorrect engine management will almost certainly cause your vehicle to fail a smog or emissions inspection.
Guaranteed Compatibility and Simple Ordering
This GM PCM 12602802 is a direct replacement for a wide range of popular GM trucks and SUVs from 2003 to 2007. It is also a compatible replacement for service numbers 89017750, 12582605, 12589463, 89017734, and 28042802. To ensure a perfect match, simply provide us with your vehicle’s VIN after placing your order. Our technicians will handle the programming, ensuring the module communicates flawlessly with all other systems in your vehicle. Installation is typically straightforward, though some vehicles may require a security relearn procedure, which can often be completed in your driveway without any special tools.
Frequently Asked Questions
What exactly does a PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of the engine and transmission to ensure optimal performance, fuel efficiency, and emissions. It takes data from dozens of sensors and makes real-time adjustments.
Does this part come ready to install?
Yes! This is the key benefit. We program the module to the specific VIN you provide, loading the latest GM software. This makes it a plug-and-play part, saving you a trip to the dealership for costly programming.
Will I need to do anything after I install it?
In many cases, you may need to perform a simple security relearn procedure, also known as a Passlock or anti-theft relearn. This procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle three times. This syncs the new PCM with your vehicle’s anti-theft system.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
How can I be sure this fits my truck?
Please review the detailed fitment list on this page. The most reliable method is to match the part number 12602802 (or one of the compatible service numbers) from your original module. If you are unsure, please contact us with your VIN before ordering.