Get Your Workhorse Back on the Road
Is your 2003 Chevy Express 3500 or GM work van suddenly unreliable? A faulty Powertrain Control Module (PCM) can bring your entire operation to a halt, costing you time and money. This replacement PCM is the definitive solution to get your vehicle running smoothly and dependably again. We take the guesswork out of the repair by programming the unit specifically to your vehicle’s VIN with the latest GM software updates before it even ships. This ensures a straightforward installation process, so you can get back to work with confidence.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a failing engine computer is the likely culprit. This professionally programmed module is designed to resolve these problems and restore your vehicle’s factory performance.
- Severe drop in fuel economy
- Engine stalling, misfiring, or running rough
- Failure to start or intermittent starting problems
- Check Engine Light is on with communication-related trouble codes (e.g., P0601, P0606)
- Harsh or erratic automatic transmission shifting
- Inability to pass an emissions test
Features & Benefits
- ✔ VIN-Programmed for Your Van: Arrives ready for installation, flashed with the latest GM software for your specific vehicle. No extra trip to the dealer needed for programming.
- ✔ Restores Peak Performance: Corrects issues with fuel delivery, ignition timing, and transmission shifting to bring back the power and efficiency you rely on.
- ✔ Direct-Fit Replacement: Engineered to be a perfect match for the original unit, ensuring all connectors and mounting points line up exactly.
- ✔ Solves Frustrating Electrical Gremlins: Eliminates false sensor codes and communication errors caused by a failing internal processor in your old 2003 Express 3500 PCM.
- ✔ Built for Durability: Designed to withstand the demanding conditions of a work vehicle, from engine bay heat to constant vibration.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Downed Fleet Van
We once worked with a plumbing contractor whose 2003 Savana van suddenly wouldn’t start. After replacing the battery and starter with no luck, diagnostics pointed to an internal PCM failure. Every day the van was down meant lost jobs and a hit to his reputation. He needed a fast, reliable fix. We sent him a VIN-programmed 2003 Express 3500 PCM that he received the next day. After a simple installation and security relearn, the van fired right up. He was back on the road and servicing customers that same afternoon, saving him from what could have been a week of lost income.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, we will need you to provide your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the module correctly for your specific engine, transmission, and options.
Is this part difficult to install?
The physical installation is straightforward for anyone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in reverse order. The most critical step after installation is performing the security relearn procedure.
What is a “security relearn” and do I need to do it?
Yes. GM vehicles have a built-in anti-theft system (Passlock/VATS) that prevents the vehicle from starting if the PCM is replaced. After installation, you must perform a simple relearn procedure, which usually takes about 30 minutes and involves turning the key on and off in a specific sequence. We can provide instructions for this process.
How do I know this will fit my vehicle?
This 2003 Express 3500 PCM is compatible with a wide range of GM trucks and vans listed in the fitment guide. The most important step is providing your VIN. We use your VIN to ensure the programming and internal hardware are a perfect match for your vehicle’s requirements.
Will this fix my specific check engine light codes?
This module is the direct solution for internal processor failure codes like P0601, P0602, P0606, and other communication-related faults. If your codes are related to specific sensors (like an oxygen sensor), you should diagnose and repair those components first. A faulty PCM can sometimes cause false sensor codes, which this unit would resolve.