Restore Your Van’s Reliability and Performance
As a technician with over two decades of experience under the hood, I’ve seen countless work vans and daily drivers sidelined by frustrating, intermittent electrical problems. If your 1999-2002 Chevrolet Express 1500 Van is suffering from a persistent Check Engine Light, erratic engine behavior, or transmission issues, the root cause is often a failing Powertrain Control Module (PCM). This isn’t just a replacement part; it’s a definitive solution. We provide a high-quality Express 1500 Van PCM that arrives at your doorstep programmed with the latest GM software updates, specifically matched to your vehicle’s VIN. This eliminates the need for expensive dealership programming and gets your van back to work, running smoothly and reliably.
From the Diagnostic Bay
I remember a 2001 Savana 2500 that came into the shop a few years back. The owner, a plumber, was at his wit’s end. The van would randomly stall at traffic lights, and the transmission would sometimes refuse to shift out of second gear. He’d already replaced the throttle position sensor and a few other parts with no luck. After hooking up my scan tool, I saw a generic P0601 ‘Internal Control Module Memory Check Sum Error’ code. This is a classic sign of a failing PCM. We swapped in a VIN-programmed module just like this one. The difference was immediate. The engine idled perfectly, shifts were crisp, and the owner called me a week later to say his fuel economy had even improved. It’s a testament to how crucial a fully functional PCM is for your vehicle’s entire operation.
Is Your Vehicle Showing These Telltale Signs?
A failing PCM can manifest in various ways, often mimicking other component failures. Before you start replacing sensors, check if you’re experiencing any of these classic symptoms:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0606, or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ The engine stalls, stumbles, or misfires for no apparent reason.
- ✔ Communication issues with your OBD-II scan tool.
Your Straightforward Installation Guide
Installing your new Express 1500 Van PCM is a job most DIYers can handle with basic tools. Our VIN programming makes it a true plug-and-play process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to fully discharge.
- Locate the Module: On most Express and Savana vans, the PCM is located in the engine compartment, typically on the driver’s side (LH rear engine compartment).
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs, so be gentle to avoid damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket. There are usually a few 7mm or 10mm bolts holding it in place.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect your battery’s negative terminal.
- Final Step: Some vehicles may require a security relearn procedure, which can often be done by cycling the key. We include simple instructions for this if it applies to your vehicle.
Verified Vehicle Compatibility List
This module is a direct-fit replacement for a wide range of GM trucks and vans. It is compatible with part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on this list:
- Chevrolet Express / GMC Savana Vans (1500/2500/3500): 1999-2002
- Chevrolet / GMC Pickups (1500/2500/3500): 1999-2000 (Gasoline Engines)
- Chevrolet Silverado / GMC Sierra 1500: 1999-2000 (4.3L V6)
- Chevrolet S10 / GMC Sonoma: 1998-2000 (4.3L V6)
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998-2000
- Chevrolet Astro / GMC Safari: 1999-2001
- Chevrolet Tahoe / GMC Yukon: 1999-2000
- Cadillac Escalade: 1999-2000
- Isuzu Hombre: 1998-2000 (4.3L V6)
- Note: Please check the original part number on your module to ensure an exact match.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is the central computer of your vehicle. It controls the engine and transmission functions, managing everything from fuel injection and ignition timing to emission controls and shift points to ensure optimal performance and efficiency.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information, as the programming is essential.
Is any additional programming required after installation?
No. This module arrives fully programmed to your VIN with the latest GM software. In most cases, it’s a direct installation. Some vehicles may require a simple security relearn procedure (instructions included), which does not require any special tools.
Will this fix my specific problem?
This part corrects issues directly caused by a faulty PCM. While the symptoms listed are common indicators, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.
What if my original part number is not 16265035?
This module is also a direct replacement for several other part numbers, including 16263494, 8162634940, 218-11787, and 21811787. As long as your original module carries one of these numbers, this part will be compatible.