Restore Peak Performance to Your Workhorse Van
As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can bring a reliable work van like the Chevy Express to a grinding halt. If you’re dealing with frustrating issues like intermittent stalling, a persistent check engine light, harsh shifting, or a no-start condition that you just can’t seem to trace, the problem often lies with the vehicle’s computer. This isn’t just a part; it’s the brain of your engine and transmission, and when it fails, it can create a cascade of confusing symptoms.
We offer a dependable and straightforward solution. This Powertrain Control Module is a direct-fit replacement for your 1999-2002 Express 2500 PCM. The best part? We take the guesswork and dealership hassle out of the equation. Before we ship it, we will program the module with the latest official GM software updates, using the specific VIN you provide. This ensures perfect compatibility and function right out of the box, restoring the performance and reliability you depend on daily.
A Technician’s Notebook
I remember a 2001 Express 2500 that came into the shop with a complaint of random stalling at traffic lights. The owner had already replaced the fuel pump and a couple of sensors, but the problem persisted. A scan showed no hard codes, just a history of communication loss faults. After checking the power and grounds to the PCM, we found them to be solid. On a hunch, we connected a scope and saw the 5-volt reference signal dropping out intermittently. This pointed directly to an internal failure in the original PCM. We installed a VIN-programmed module just like this one, performed the security relearn, and the van ran flawlessly. It’s a classic case where the PCM was the root cause, mimicking other, more common failures.
Is Your Van Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re noticing any of the following, it might be time for a replacement:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) for internal module failure, like P0601 (Internal Control Module Memory Check Sum Error)
- ✔ Unexplained stalling or rough idling
- ✔ The engine cranks but will not start
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Installing your new 1999-2002 Express 2500 PCM is a manageable job for a confident DIYer or any professional mechanic. Follow these steps for a smooth installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most Express and Savana vans, the PCM is located in the engine compartment, on the left-hand (driver’s) side, toward the rear.
- Disconnect Connectors: Carefully unclip and remove all wiring 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 onto the bracket and securely re-fasten the bolts.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module. Reconnect the negative battery terminal.
- Perform Security Relearn (CRITICAL): Your vehicle’s anti-theft system (Passlock/VATS) will prevent it from starting until a security relearn procedure is completed. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Consult your service manual for the exact procedure for your model year.
Verified Vehicle Compatibility
This module, part number 218-11787, is a direct replacement for several original equipment numbers, including 16263494 and 16265035. It is guaranteed to fit a wide range of GM trucks and vans. While this listing is for the 1999-2002 Express 2500 PCM, it also fits the following vehicles (please verify your specific options and part number ID):
- ✔ Chevrolet Express / GMC Savana 1500, 2500, 3500 (1999-2002)
- ✔ Chevrolet Silverado / GMC Sierra 1500, 2500, 3500 (1999-2000)
- ✔ Chevrolet Tahoe / GMC Yukon (1999-2000)
- ✔ Cadillac Escalade (1999-2000)
- ✔ Chevrolet Astro / GMC Safari (1999-2001)
- ✔ Chevrolet S10 / GMC Sonoma (1998-2000)
- ✔ Chevrolet Blazer / GMC Jimmy (1998-2000)
- ✔ Oldsmobile Bravada / Isuzu Hombre (1998-2000)
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. Providing your Vehicle Identification Number (VIN) is critical. We use it to load the correct, vehicle-specific GM software and calibrations onto the module. This step ensures the PCM communicates perfectly with your engine, transmission, and other systems.
Is any additional programming needed after installation?
No dealership programming is required. Because we program the module to your VIN before shipping, it’s ready to go. However, you MUST perform the vehicle’s security relearn procedure. Without this, the engine will not start.
What if I have a different part number on my old module?
This module is compatible with several part numbers, including 16263494, 16265035, and 8162634940. If your number is listed in our compatibility chart, this part will work for your vehicle. If you’re unsure, please contact us with your VIN and original part number.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM failure (like code P0601), then yes, this part is the correct fix. However, if the light is on due to a faulty sensor or other component, you will still need to diagnose and repair that separate issue.