Restore Your Vehicle’s Performance with a VIN-Programmed Powertrain Control Module
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic engine behavior, or poor fuel mileage in your GM truck or van, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cause a cascade of problems that are difficult to diagnose. This replacement 1999-2002 Express 2500 Van PCM is the reliable, straightforward solution you need to get your vehicle running properly again.
This isn’t just a part in a box. We take the hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it arrives with the latest GM software updates, ready for installation. You skip the expensive trip to the dealership for programming, saving you time and money. Simply provide your VIN after purchase, and we’ll handle the rest, shipping you a part that’s truly ready to go.
A Technician’s Notebook: The Ghost in the Transmission
I remember a 2001 Savana 2500 that came into the shop with a complaint of harsh, unpredictable shifting and a random stalling problem that no one could solve. The transmission had been checked, sensors were replaced, but the issue persisted. After hooking up my diagnostic scanner, I noticed erratic data coming from the PCM—it wasn’t commanding the transmission shifts correctly. The internal processor was failing, but only intermittently. We installed a VIN-programmed PCM just like this one. After the quick security relearn, the van drove perfectly. The harsh shifts vanished, the stalling stopped, and the customer was thrilled to have his reliable workhorse back. It’s a classic example of how the PCM, the vehicle’s brain, can cause symptoms that seem unrelated.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention. I’ve frequently traced these issues back to an internal PCM fault, often accompanied by diagnostic trouble codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Check Engine Light is illuminated
- ✔ Engine stalling or cutting out while driving
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Vehicle won’t start, or is very hard to start
- ✔ A noticeable drop in fuel economy
- ✔ Failure to pass an emissions inspection
- ✔ Communication errors with diagnostic scan tools
Your Straightforward Installation Guide
Installing your new 1999-2002 Express 2500 Van PCM is a manageable job for a confident DIYer. Follow these steps carefully for a successful replacement. The location is typically in the engine compartment, either on the driver’s side fender or near the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge.
- Locate the PCM: On most Express/Savana vans, the PCM is located in the LH rear of the engine compartment. On pickups and SUVs, it’s often on the LH side near the battery or firewall.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Never force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in place by a few small bolts.
- Install the New PCM: Mount your new, pre-programmed module in the same location. Securely reconnect the electrical harnesses, ensuring they click into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a security relearn procedure (often called a CASE learn or Passlock relearn) so the vehicle recognizes the new PCM. This procedure is simple and typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Specific instructions for your vehicle are widely available online.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM trucks and vans. It is compatible with part numbers 16263494, 16265035, 8162634940, and 218-11787. Please verify your vehicle is on the list below. If you have any questions, we’re here to help.
This module fits dozens of models including, but not limited to:
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500) – 1999-2002
- Chevrolet Silverado & GMC Sierra Pickups (1500, 2500, 3500) – 1999-2000
- Chevrolet Tahoe & GMC Yukon – 1999-2000
- Chevrolet Astro & GMC Safari Vans – 1999-2001
- Chevrolet S10, GMC Sonoma, Chevrolet Blazer, GMC Jimmy – 1998-2000
- Cadillac Escalade – 1999-2000
- Oldsmobile Bravada, Isuzu Hombre, GMC Envoy – 1998-2000
Frequently Asked Questions about this PCM
Frequently Asked Questions
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 the module until we receive this information, as the programming is essential.
Is this a simple plug-and-play part?
Almost. It comes pre-programmed to your VIN, which handles the most complex part. However, you will need to perform a security relearn procedure after installation. This process syncs the new PCM to your vehicle’s anti-theft system and is required for the engine to start. It does not require special tools.
Will this fix my specific problem?
This part is a direct solution for a failed PCM. If your vehicle exhibits common symptoms like stalling, no-start conditions, communication errors (P0601), or erratic shifting, and you’ve ruled out other causes, this module is very likely the fix you need.
Do I need to send my old PCM back?
No core charge is required for this part. You can keep or responsibly recycle your old module without needing to return it to us.
What if my part number isn’t listed but my vehicle is?
The listed part numbers (16263494, 16265035, etc.) are the most common. If your vehicle model and year are listed in the compatibility chart, this module will work, as the programming we perform makes it compatible.
Where is the PCM located on my 1999-2002 Express 2500 Van?
On the 1999-2002 Express and Savana vans, the PCM is located in the engine bay, on the driver’s side, towards the rear of the compartment.