Restore Peak Performance to Your GM Vehicle
Is your 2003 GMC Savana, Chevy Express, Sierra, or Silverado running poorly? Are you battling a persistent check engine light, erratic shifting, or a frustrating no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. Don’t let a faulty module keep your truck or van off the road. This direct-replacement PCM, part number 89017733, is the reliable, plug-and-play solution you need to get back in control.
The PCM is the brain of your vehicle’s operation, constantly processing data from dozens of sensors to control fuel injection, ignition timing, transmission shift points, and emissions systems. When it fails, the symptoms can be widespread and often misdiagnosed, leading to costly and unnecessary repairs. By replacing your old, failing unit with this quality-tested module, you restore the precise communication and control necessary for optimal power, fuel efficiency, and smooth operation.
From the Diagnostic Bay
We had a 2003 Silverado 2500 with the 8.1L V8 come in with what the owner was sure was a failing transmission. It was shifting hard, sometimes getting stuck in gear, and throwing a handful of transmission-related codes. He had already spent hundreds on a fluid flush and a new solenoid pack with no improvement. After hooking up our professional scan tool, we noticed the PCM was intermittently dropping communication with the Transmission Control Module (TCM), which is integrated into the PCM on this platform. The transmission itself was fine; the PCM was sending bad signals. We installed one of these programmed modules, performed the security relearn, and the truck drove like new. It saved the owner from a multi-thousand-dollar transmission replacement he didn’t need.
Why Choose Our Programmed 2003 Express 3500 PCM?
The biggest hurdle in replacing a modern vehicle computer is the programming. Typically, you’d have to buy the part, install it, and then have your vehicle towed to a dealership for expensive flashing. We eliminate that entire process. When you order from us, you simply provide your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most stable GM-certified software specific to your exact vehicle build. This ensures that it works seamlessly with your engine, transmission, and all factory options. It arrives at your door ready for installation, saving you time, money, and hassle.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Harsh, erratic, or delayed automatic transmission shifting
- ✔ Complete no-start or crank-no-start condition
- ✔ Significant drop in fuel economy
- ✔ Engine stumbling, misfiring, or stalling
- ✔ Communication errors with diagnostic scan tools
- ✔ Instrument cluster warning lights like “Service Engine Soon”
This module is a direct replacement for a wide range of GM trucks, vans, and even some performance cars from the 2003-2004 model years. It is compatible with multiple original service numbers, including 12581565, 12570557, 12576106, and the primary part number 89017733. Please verify the fitment list to ensure compatibility with your specific model, such as the Yukon XL 2500, Avalanche 2500, Suburban 2500, or S10/Blazer with the 4.3L engine.
Frequently Asked Questions
What exactly does the PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission function, including fuel mixture, spark timing, variable valve timing, and automatic transmission shifting, to ensure optimal performance, fuel economy, and emissions.
Is this part difficult to install?
For most of the listed vehicles, the PCM is located in the engine bay (either on the driver’s side near the battery or on the passenger side firewall) and is held in by a few bolts and electrical connectors. Installation is typically straightforward for someone with basic mechanical skills. Always disconnect the battery before beginning the installation.
Do I need to do anything after installation?
Because this module is pre-programmed to your VIN, no dealership visit is required. However, you will likely need to perform a simple security relearn procedure, also known as a Passlock or VATS relearn. This can usually be done in your driveway with just the ignition key and takes about 30 minutes. Instructions are readily available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. You can typically find your VIN on the driver’s side of the dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my specific problem?
While this PCM is a solution for a wide range of electronic and performance issues, proper diagnosis is key. If your vehicle’s symptoms match those of a failing PCM and you have ruled out other potential causes like faulty sensors or wiring, this module is very likely the solution you need.
This part has many compatible numbers. Does that matter?
No. Automotive manufacturers often update part numbers over time. The part number 89017733 and its equivalents like 12581565 are all physically and functionally identical for the applications listed. We program the module based on your VIN, ensuring it has the correct software for your vehicle regardless of the number on your old unit.