Restore Peak Performance to Your GM Truck or SUV
Is your Cadillac Escalade, Chevy Silverado, or GMC Sierra suffering from erratic behavior? Issues like poor fuel economy, harsh shifting, a persistent check engine light, or even a no-start condition can often be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from the engine’s air-fuel mixture and ignition timing to the transmission’s shift points. When it fails, the entire vehicle’s performance and reliability are compromised.
This replacement PCM, corresponding to service number 12602802, is the definitive solution to restore your vehicle’s factory operation. We take the guesswork out of the repair process. Upon purchase, simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN), and our technicians will program the module with the latest, most stable software updates directly from General Motors. This ensures that your new PCM is perfectly matched to your vehicle’s specific configuration, options, and emissions standards, providing a seamless and effective repair.
From the Diagnostic Bay
We had a 2005 Chevy Tahoe in the shop that was driving the owner crazy. It had a random, harsh 1-2 shift and an intermittent P0700 transmission control system code. The owner had already replaced the transmission solenoids and fluid, with no change. After checking all the wiring and grounds between the transmission and the PCM, we suspected the module itself. The internal driver for that specific shift solenoid was failing under heat. We installed a VIN-programmed PCM, performed the security relearn, and the truck shifted like it just rolled off the assembly line. It’s a classic case where the problem seems to be in one place (the transmission) but is actually caused by the computer that controls it.
Diagnosing and Replacing Your 2003-2006 Escalade PCM
A failing PCM can manifest in numerous ways, often mimicking other component failures. Before condemning your module, it’s always wise to check for solid battery voltage, clean ground connections, and intact wiring. However, if other potential causes have been ruled out, a faulty PCM is a likely culprit. Replacing the module is a straightforward mechanical process, typically located under the hood on the driver’s side, near the battery or airbox. The critical step is the programming, which we handle for you before shipment. This saves you a costly trip to the dealership and eliminates the need for expensive scan tools.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light (CEL) is illuminated with various trouble codes.
- ✔ Vehicle fails to start or starts intermittently.
- ✔ Rough idling or stalling.
- ✔ Poor acceleration and overall engine performance.
- ✔ Decreased fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Misfire codes (e.g., P0300) that aren’t resolved by new plugs or coils.
This module is a direct replacement for a wide array of GM vehicles from 2003 to 2007, including the Hummer H2, Chevy Avalanche, Suburban, Tahoe, Silverado, GMC Yukon, and Sierra. It is compatible with multiple service numbers, including 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. By providing a unit programmed to your specific VIN, we ensure compatibility and proper function of all your vehicle’s systems.
Frequently Asked Questions
What information do I need to provide for programming?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN). You can typically find this on your driver’s side dashboard (visible through the windshield), on your door jamb sticker, or on your vehicle’s registration and insurance documents. Please provide it during or after checkout.
Is this part truly plug-and-play?
While the module is programmed to your VIN for engine and transmission operation, you will need to perform a security relearn procedure after installation. This procedure syncs the new PCM with your vehicle’s anti-theft system and can typically be done without special tools. Instructions are readily available online for your specific model, often involving a sequence of key turns. A crankshaft variation relearn (CASE relearn) may also be required with a capable scan tool to clear certain codes.
Will this fix my specific problem?
This PCM will correct issues directly caused by a faulty module. While the symptoms listed are common indicators of PCM failure, it is essential to have your vehicle properly diagnosed. This part will not fix problems related to other faulty sensors, wiring, or mechanical components.
My original part number is not 12602802, but it’s on the compatible list. Will this work?
Yes. Manufacturers often supersede part numbers over time. As long as your original service number is listed as compatible (e.g., 89017750, 12582605, etc.), this module is the correct replacement. The VIN programming ensures it functions identically to your original.
Does this module come with keys?
No, this is only for the Powertrain Control Module. You will use your existing keys. The security relearn procedure will sync your current keys to the new module.