Restore Peak Performance to Your GM Truck or Van
Is your 2003 GMC Sierra 3500, or another compatible GM vehicle, suffering from baffling issues like intermittent stalling, erratic shifting, a persistent check engine light, or a complete no-start condition? As a technician with over two decades of experience, I’ve seen countless vehicles sidelined by a failing Powertrain Control Module (PCM). This isn’t just a part; it’s the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it falters, your entire vehicle’s performance and reliability are compromised.
This replacement PCM, part number 89017733, is the definitive solution. We take the guesswork and dealership hassle out of the equation. Before we ship, we flash the module with the latest official GM software, precisely matched to your vehicle using your VIN. This means it arrives ready for installation, saving you from costly towing fees and programming appointments.
From the Diagnostic Bay: The Case of the Ghostly Stall
I remember a 2003 Silverado 2500 with the 8.1L V8 that came into my shop. The owner was frustrated. The truck would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 20 minutes. There were no consistent trouble codes, just a random U0100 (Lost Communication with ECM/PCM) that would appear and disappear. We checked grounds, wiring, and fuel pressure—all perfect. The intermittent nature pointed to one culprit: the PCM. Heat soak was causing an internal failure. We installed a VIN-programmed module just like this one, and the truck never had the issue again. This isn’t just a part swap; it’s restoring dependability.
Is Your GM Vehicle Showing These Signs of PCM Failure?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module is a likely cause. Look out for these symptoms and associated Diagnostic Trouble Codes (DTCs):
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606 (Internal Module Errors).
- ✔ Vehicle won’t start or is extremely difficult to start.
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with your scan tool (U-codes).
- ✔ Apparent failure of multiple sensors at once.
Why a Pre-Programmed 2003 Sierra 3500 PCM is the Smart Choice
Choosing a module that is pre-flashed to your VIN is the most efficient path back to reliability. A generic or junkyard module would require a high-end scan tool and a subscription to GM’s service programming system. Our process handles that for you. We ensure the software is correct for your vehicle’s specific options and emissions, providing a seamless integration that restores factory-level function. This is the professional-grade solution made accessible for every vehicle owner.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks and vans is a job most DIYers can handle with basic tools. The module is typically located in the engine bay, under the battery tray on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most trucks like the Sierra/Silverado, you will need to remove the battery and the battery tray to access the PCM mounted below it. On Express/Savana vans, it’s often on the driver’s side of the engine compartment.
- Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM into the bracket and securely re-attach the electrical connectors. You should hear a click as they lock in place.
- Reassemble: Reinstall the battery tray and the battery. Reconnect the negative battery terminal.
- Perform Security Relearn: You may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn). This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the vehicle to recognize the new PCM.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles. Please verify your vehicle is on this list. It is compatible with service numbers 12581565, 12570557, 12576106, 12578127, 89017733, and others.
- Chevrolet Avalanche 2500 (2003) – 8.1L
- Chevrolet Blazer S10 (2003)
- Chevrolet Corvette (2004) – ID 12581565
- Chevrolet Express Vans (1500, 2500, 3500) (2003)
- Chevrolet S10 Pickup (2003) – 4.3L
- Chevrolet Silverado Pickups (1500, 2500, 3500) (2003) – 4.3L or 8.1L Gasoline
- Chevrolet Suburban 2500 (2003) – 8.1L
- Cadillac CTS (2004) – Base, ID 12581565
- GMC Jimmy S15 (2003)
- GMC Safari Van (2003)
- GMC Savana Vans (1500, 2500, 3500) (2003)
- GMC Sierra Pickups (1500, 2500, 3500) (2003) – 4.3L or 8.1L Gasoline
- GMC Sonoma (2003) – 4.3L
- GMC Yukon XL 2500 (2003) – 8.1L
- Chevrolet Astro Van (2003)
What information do you need from me?
After you place your order, we simply need your 17-digit Vehicle Identification Number (VIN). This allows us to load the exact, correct GM software for your truck’s engine, transmission, and options.
Is this part difficult to install?
No, for most individuals with basic mechanical skills, this is a straightforward replacement. It involves disconnecting the battery, unplugging the old module, and bolting the new one in. The key is our pre-programming, which eliminates the need for special computer tools.
What is a “security relearn” and will I need to do it?
Yes, most likely. It’s a simple, tool-free procedure that syncs the new PCM to your vehicle’s anti-theft system. It typically takes about 30 minutes and involves cycling the ignition key. We can provide instructions if needed.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like codes P0601-P0606), then yes, this module will resolve the issue. However, you must ensure that any other codes (e.g., for a bad oxygen sensor) have been properly diagnosed and fixed first.
Is this a brand new part?
This is a high-quality, tested replacement part that is guaranteed to meet or exceed original equipment performance. It is loaded with new, updated GM software specific to your VIN.