Restore Your Vehicle’s Core Performance
Is your GM truck or SUV suffering from baffling engine problems, a persistent check engine light, or a no-start condition? The Powertrain Control Module (PCM) is the central computer of your vehicle, orchestrating everything from fuel injection and spark timing to transmission shifting and emissions control. When it fails, it can cause a cascade of issues that are often misdiagnosed, leading to wasted time and money on unnecessary parts. This direct-fit replacement PCM, part number 12602802, is the definitive solution to restore your vehicle’s operational integrity.
We make the replacement process straightforward. Unlike a generic module from a parts store or salvage yard, each unit is professionally programmed to your vehicle’s specific 17-digit VIN before it ships. This ensures seamless communication with your truck’s other modules, security system, and specific equipment. We load the latest GM-certified software updates, which often resolve underlying driveability issues that were present even from the factory. Get your vehicle back to factory-spec performance and reliability.
From the Diagnostic Bay
We had a 2005 Silverado 1500 come into the shop with a dead misfire on cylinder 3. The owner was frustrated, having already replaced the spark plug, ignition coil, and plug wire. A quick check with a noid light revealed the fuel injector wasn’t receiving a pulse. While many would suspect a bad injector or wiring, experience pointed us elsewhere. We tested the injector driver signal directly at the PCM connector and found nothing. The internal driver circuit inside the original module had failed—a common issue on these units. We installed a VIN-programmed PCM, performed the security relearn, and the truck ran perfectly. Proper diagnosis confirmed the PCM was the root cause, saving the customer from more guesswork.
Common Symptoms of a Failing GM PCM 12602802
- ✔ Persistent Check Engine Light (CEL) with communication codes (e.g., U0100) or multiple random sensor codes.
- ✔ Engine stalling, stumbling, or experiencing intermittent no-start conditions.
- ✔ Noticeable decrease in fuel economy and a significant loss of engine power.
- ✔ Harsh, erratic, or delayed shifting from the automatic transmission.
- ✔ Complete failure of one or more fuel injectors or ignition coils to operate.
- ✔ Vehicle fails to pass state emissions testing due to readiness monitor issues.
- ✔ Inaccurate gauge readings or complete loss of communication with the instrument cluster.
Installation and Relearn Procedure
Replacing the PCM is a simple mechanical task, typically located under the hood on the driver’s side, near the battery or airbox. Once the new module is installed, you must perform a security relearn procedure to sync the PCM with your vehicle’s anti-theft system. This procedure is simple and does not require special tools. A common method involves turning the key to the ‘ON’ position for 10-12 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. For optimal performance and to clear certain diagnostic trouble codes, a Crankshaft Variation Relearn (CASE relearn) using a compatible professional scan tool is also highly recommended.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. You must perform your vehicle’s security relearn procedure to sync the new module with your keys and anti-theft system. We also highly recommend a Crankshaft Variation Relearn (CASE relearn) with a capable scan tool to ensure optimal engine performance.
How do I provide my VIN for programming?
After you complete your purchase, please send us your 17-digit Vehicle Identification Number (VIN). You can typically add it as a note during checkout or reply to your order confirmation email. We cannot ship your part until we receive the VIN.
Is this a brand new part from the dealer?
This is a high-quality, fully tested replacement part that has been meticulously inspected and prepared for service. It is programmed with the latest GM software for your vehicle and is guaranteed to meet or exceed original equipment performance.
Will this PCM fix my vehicle’s problem for sure?
This module is a guaranteed fix for a faulty PCM. However, it is crucial that your vehicle has been properly diagnosed. This part will not solve problems related to other faulty components, such as bad sensors, damaged wiring, or mechanical engine issues.
What vehicles does this GM PCM 12602802 fit?
This PCM fits a very wide range of 2003-2007 General Motors trucks and SUVs, including many Silverado, Sierra, Suburban, Tahoe, Yukon, Escalade, and Hummer H2 models. Please refer to our detailed compatibility list and confirm your original part number to ensure a perfect match.