Is your 2005-2007 GMC Sierra 3500 experiencing frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your truck’s engine and transmission. A faulty PCM can disrupt critical functions, leaving your powerful workhorse unreliable. This replacement PCM, part number 12602801, is the definitive solution to restore your truck’s performance, reliability, and drivability.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or salvage yard, this unit is professionally programmed specifically for your vehicle. After your purchase, simply provide us with your truck’s Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication between the PCM and all other vehicle systems, just as the factory intended. This VIN-specific programming is crucial for proper operation of the engine, transmission, anti-lock brakes, and security systems.
Common Symptoms of a Failing GM PCM
- ✔ Persistent and unexplained Check Engine Light (CEL)
- ✔ Rough or inconsistent engine idle
- ✔ Harsh, delayed, or erratic automatic transmission shifting
- ✔ Complete engine failure to start (no-start condition)
- ✔ A noticeable decrease in fuel efficiency
- ✔ Stalling or hesitation during acceleration
- ✔ Communication errors with diagnostic scan tools
- ✔ False error codes for other sensors and modules
Your Direct-Fit 2005-2007 Sierra 3500 PCM Solution
This module is a direct replacement for your original unit, designed to meet or exceed original equipment specifications. By providing a unit that is pre-flashed to your VIN, we eliminate the need for expensive trips to the dealership for programming. This is a plug-and-play solution, although some vehicles may require a simple security relearn procedure (often called a CASE relearn or anti-theft relearn) which can typically be done in your driveway without special tools. This process syncs the new PCM with your vehicle’s anti-theft system. This high-quality 2005-2007 Sierra 3500 PCM is your key to getting your truck back on the road with confidence.
This module is a direct replacement for part numbers: 12589462, 12602801, and 89017749.
Guaranteed Vehicle Compatibility
This Electronic Control Module is guaranteed to be compatible with the following vehicles, provided the options match. It is crucial to match your part number or confirm fitment for your specific application.
- GMC Sierra & Chevrolet Silverado 1500/2500/3500 (2005-2007 Classic): Fits models with 4.3L and 8.1L gasoline engines.
- GMC Savana & Chevrolet Express Vans (2005-2007): Broad compatibility with gasoline engine models.
- GMC Yukon XL 2500 & Chevrolet Suburban 2500 (2005-2006): Fits models with the 8.1L engine.
- Chevrolet Avalanche 2500 (2005-2006)
- GMC Safari & Chevrolet Astro (2005)
- Cadillac CTS-V (2004-2005): Matches specific IDs 12589462 & 12602801.
- S10 Blazer / S15 Jimmy (2005)
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your truck.
Where is the PCM located on my 2006 Sierra 3500?
On most 2005-2007 classic body style Sierra and Silverado trucks, the PCM is located in the engine bay on the driver’s side, underneath the battery tray.
What is a VIN and why do you need it?
The VIN is your Vehicle Identification Number, a unique 17-digit code for your truck. We use it to access the exact factory software and calibration files for your specific engine, transmission, and options, ensuring a perfect match.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM, then yes, this part will resolve the issue. However, it’s always best to have the codes read by a scanner to confirm the source of the problem before ordering.
Is any other setup required after installation?
In many cases, you may need to perform a security relearn procedure. This simple process can usually be done without special tools and involves a sequence of key turns. This syncs the new PCM to your vehicle’s anti-theft system and is a necessary security step.