Is Your GM Truck or Van Running Rough?
The Powertrain Control Module, or PCM, is the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shifting and emissions controls. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems, leaving you stranded or dealing with an unreliable vehicle. If your 2003 Chevy Express, GMC Savana, or other compatible GM vehicle is experiencing perplexing issues, a failing PCM could be the culprit.
Your Direct-Fit Solution: The 2003 Express 3500 PCM
This Powertrain Control Module, part number 12576106, is the definitive solution to get your vehicle operating as it should. We take the guesswork and hassle out of the replacement process. Unlike a generic part from a local store, this module is specifically programmed for your vehicle before it ships. By providing us with your vehicle’s unique Vehicle Identification Number (VIN), we flash the module with the latest, most stable software updates directly from General Motors. This ensures seamless communication between the new PCM and all other electronic systems in your truck or van, restoring factory performance and reliability.
From the Diagnostic Bay
We had a 2003 GMC Savana 3500 work van come into the shop with a complaint of intermittent stalling at stoplights and a persistent P0606 (PCM Processor Fault) code. The owner had already replaced the spark plugs, ignition coil, and fuel filter with no success. After verifying power and ground to the module, we knew the internal processor was failing. Instead of sending the owner to the dealership for a costly replacement and programming session, we sourced a VIN-programmed module like this one. The installation took less than 30 minutes, and the van fired right up and idled perfectly. The check engine light was gone, and the stalling issue was completely resolved. It’s a prime example of how a pre-programmed module saves both time and money.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various codes.
- ✔ Engine stalling, misfiring, or running rough.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions inspections.
- ✔ Intermittent loss of power or hesitation during acceleration.
Replacing your faulty computer with this pre-programmed 2003 Express 3500 PCM is the most effective way to address these issues. The process is simple: place your order, provide us with your VIN, and we handle the complex programming. The part arrives at your door ready for a straightforward installation, getting you back on the road with confidence.
Frequently Asked Questions
Do I need to get this module programmed?
No. This module comes fully programmed to your vehicle’s specific VIN before we ship it. It is ready for installation right out of the box, saving you a trip to the dealership and expensive programming fees.
What information do you need from me?
After you complete your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle. You can typically find this on your driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Where is the PCM located on my 2003 Express 3500?
On most 2003 GM vans like the Express and Savana, the PCM is located in the engine compartment on the driver’s side, often near the battery or air filter housing. On trucks like the Silverado and Sierra, it is typically found under the battery tray on the driver’s side front.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this replacement part will resolve the issue. However, it is always recommended to have the codes read with a diagnostic scanner to ensure the PCM is the root cause of the problem and not another sensor or component.
Is any additional setup required after installation?
In some cases, a security relearn procedure may be necessary for the vehicle to start. This is a simple procedure that typically involves cycling the key in the ignition and can be done without any special tools. Instructions are widely available online for your specific model.