Restore Your Van’s Performance and Reliability
Is your 1999-2002 Express 3500 Van suddenly stalling, refusing to start, or running rough? A failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its health is critical for performance, fuel economy, and dependability. When it fails, it can bring your work to a grinding halt. This isn’t just an inconvenience; it’s lost time and money. We offer a direct-fit, reliable solution to get your workhorse back on the road fast.
This isn’t just a part in a box. This is a complete, ready-to-install solution. We take the hassle and high cost of dealership programming out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest official GM software specific to your Express Van. This ensures seamless communication between all your vehicle’s systems and restores the performance you depend on. This is the most efficient way to replace a faulty 1999-2002 Express 3500 PCM and solve those frustrating electronic gremlins for good.
From the Diagnostic Bay: The Phantom No-Start
A local contractor brought in his 2001 Express 3500 that had an intermittent no-start condition that was driving him crazy. He’d already replaced the battery, starter, and fuel pump based on other shops’ advice, but the problem persisted. When it got to my bay, I noticed the security light was flashing randomly and the scan tool would sometimes lose communication with the PCM. This is a classic sign of internal PCM failure. The main processor was failing intermittently, especially when hot. We installed one of our VIN-programmed modules, performed the quick security relearn, and the van fired up instantly. He called a week later to say it hadn’t missed a beat. It wasn’t the parts he replaced; it was the computer controlling them all along.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, a new module is likely the solution:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Engine stalling or shutting off while driving
- ✔ Complete no-start condition
- ✔ Poor or erratic automatic transmission shifting
- ✔ Drastically reduced fuel economy
- ✔ Communication error codes, especially P0601 (Internal Control Module Memory Check Sum Error) or other U-codes
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing your 1999-2002 Express 3500 PCM is a job most DIYers can handle with basic tools. Our pre-programmed module makes it even simpler.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the Express/Savana vans, the PCM is typically located in the engine compartment on the driver’s side, near the rear.
- Disconnect the Module: Carefully unplug all the wiring harness connectors. These connectors have locking tabs that need to be released before you can pull them out.
- Remove the Old PCM: Unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, programmed module in the same location and securely fasten it.
- Reconnect Everything: Plug all the wiring harnesses back into the correct sockets until they click securely in place. Reconnect the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This usually involves turning the key to the ‘ON’ position for 10-15 minutes. (Consult your vehicle’s service information for the exact procedure).
Will This Fit My Vehicle?
This module is a guaranteed fit for the following vehicles, provided the part number on your original module matches one of the compatible numbers listed. This unit replaces part numbers: 16263494, 16265035, 8162634940, 218-11787.
CHEVROLET 3500 PICKUP 99-00 (Gasoline)
EXPRESS 1500 VAN 99-02
EXPRESS 2500 VAN 99-02 (Gasoline)
EXPRESS 3500 VAN 99-02 (Gasoline)
SAVANA 1500 VAN 99-02
SAVANA 2500 VAN 99-02 (Gasoline)
SAVANA 3500 VAN 99-02 (Gasoline)
ASTRO 99-01 (4.3L)
SAFARI (GMC) 99-01 (4.3L)
BLAZER S10/JIMMY S15 98-00
BRAVADA 98-00
S10/S15/SONOMA 98-00 (4.3L)
ENVOY 98-00
ISUZU HOMBRE 98-00 (4.3L)
GMC 1500 PICKUP 99 (5.0L, 5.7L)
GMC 2500 PICKUP 99-00 (Gasoline)
GMC 3500 PICKUP 99-00 (Gasoline)
SIERRA 1500 PICKUP 99-00 (6 cylinder)
SILVERADO 1500 PICKUP 99-00 (6 cylinder)
SUBURBAN 1500/2500 99 (Gasoline)
TAHOE 99-00 (Classic Style)
YUKON 99-00 (Denali/Classic)
ESCALADE 99-00
A properly functioning 1999-2002 Express 3500 PCM is essential. Don’t let a faulty module keep you off the road. Order today for a simple, reliable fix.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your 17-digit Vehicle Identification Number (VIN). You can also add it to the ‘notes’ section during checkout. We cannot ship your part until we have this information.
Is any additional programming required after installation?
No. This module arrives fully programmed to your VIN with the latest GM software. The only step required is a simple ‘security relearn’ procedure, which does not require any special tools and can be done in your driveway.
Will this fix my specific problem?
This PCM will correct issues directly caused by a failing module, such as internal processor errors (P0601), communication faults, and erratic behavior. While it solves many common problems, you should always ensure your vehicle’s issues have been properly diagnosed by a qualified technician.
Are these modules tested?
Yes, every module undergoes rigorous testing on a specialized bench simulator to ensure all circuits and processors are functioning correctly before it is programmed and shipped.
What is the difference between an ECM and a PCM?
ECM (Engine Control Module) and PCM (Powertrain Control Module) are often used interchangeably. A PCM controls both the engine and the automatic transmission, while an ECM may only control the engine. For these GM vehicles, the correct term is PCM, as it manages the entire powertrain.