Is Your GM Truck or Van Running Rough?
If your Chevrolet Blazer, Silverado, Express Van, or other compatible GM vehicle is experiencing perplexing issues like stalling, erratic shifting, a persistent Check Engine Light, or even a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, the PCM’s health is critical for performance, fuel economy, and reliability. When it begins to fail, it can create a cascade of problems that are difficult to diagnose. This replacement module, part number 12589462, is the definitive solution to restore your vehicle’s factory performance and get you back on the road with confidence.
From the Diagnostic Bay
We had a 2006 Silverado 2500 with the 8.1L V8 come into the shop. The customer complained of intermittent stalling at stoplights and a strange, delayed shift from 2nd to 3rd gear. There were no consistent trouble codes, just a generic communication error that would pop up now and then. We checked the wiring, sensors, and transmission fluid, all of which were fine. After hours of chasing our tails, we decided to monitor the PCM’s live data stream. We noticed the processor would occasionally ‘hiccup,’ causing a momentary loss of sensor readings. It was a classic case of internal PCM failure that a simple code reader would never catch. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran like it just rolled off the assembly line. It’s a reminder that sometimes, the ‘brain’ is the problem, not the body.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light is illuminated with various, often inconsistent, trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Plug-and-Play Solution for Your 2005 Blazer S10 PCM
Don’t waste time and money at a dealership with expensive diagnostics and programming fees. We take the guesswork and hassle out of the repair. This module isn’t just a part in a box; it’s a complete solution. When you order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then use official GM equipment to flash the module with the latest factory software specific to your exact vehicle. This ensures perfect compatibility with your engine, transmission, and all factory-installed options. The module arrives at your door ready for installation, saving you a trip to the dealer and the high cost of their programming services.
This unit is a direct replacement for multiple OEM part numbers, including 12589462, 12602801, and 89017749. It fits a wide range of GM trucks, vans, and SUVs. Please verify the fitment list below to ensure compatibility with your specific model.
Installation Note
While the module is programmed to your VIN, most GM vehicles of this era will require a simple, key-on/key-off procedure known as a “Security Relearn” or “Anti-Theft Relearn” to sync the new PCM with your vehicle’s existing anti-theft system. This procedure does not require special tools and can typically be completed in your driveway in about 30 minutes. Instructions are readily available online or in your vehicle’s service manual.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your vehicle.
Where do I find my 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.
What is a security relearn procedure?
It’s a simple sequence of turning the ignition key on and off for set periods to allow your vehicle’s anti-theft system to recognize the new PCM. It does not require any special tools and is a necessary step for the vehicle to start and run with the new module.
Is this compatible with my 2007 Silverado with a 4.3L V6?
Yes, this module is compatible with the 2007 ‘Classic’ style Silverado 1500 with the 4.3L engine. Please review the full fitment list on the page to confirm compatibility with your specific year, make, and model.
Can a bad PCM cause my transmission to shift poorly?
Absolutely. The Powertrain Control Module controls both engine functions and transmission shift points. A failing PCM can cause harsh shifting, delayed engagement, or incorrect gear selection, even if the transmission itself is mechanically sound.