Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet, GMC, or Isuzu truck suffering from frustrating, hard-to-diagnose issues? A faulty Powertrain Control Module (PCM) is often the hidden culprit behind problems like erratic idling, poor fuel economy, harsh shifting, or even a no-start condition. As the central computer for your engine and transmission, its health is non-negotiable. This replacement 1999-2000 Chevrolet 2500 PCM is the definitive solution to get your vehicle running reliably again, without the excessive costs and scheduling hassles of a dealership visit.
We take the guesswork and complexity out of the repair. Unlike a generic module from a parts store, this PCM arrives at your door fully programmed with the latest official GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This means no extra tools, no expensive programming appointments—just a straightforward installation to restore your truck’s original performance and efficiency.
From the Diagnostic Bay: The Case of the Phantom Misfire
I once had a 2000 Chevy Silverado in my shop that was driving the owner crazy. It had a random misfire (P0300) that would come and go. He had already replaced the plugs, wires, cap, and rotor. We checked fuel pressure and injectors—all perfect. On a hunch, I monitored the PCM’s driver outputs for the ignition coil. Sure enough, we saw intermittent signal drops that weren’t being flagged as a specific circuit fault. The internal processors were failing under load. We installed a VIN-programmed PCM just like this one, and the truck ran perfectly. It’s a classic example of how a failing computer can mimic a mechanical problem, costing you time and money on unnecessary parts.
Is Your Vehicle Showing These Symptoms?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0605, or other internal processor faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with your scan tool.
- ✔ Failure to pass an emissions test due to module-related faults.
A Straightforward Guide to Your PCM Swap
Installing your new pre-programmed PCM is a job most DIYers can handle with basic tools. While the exact location varies by model (see fitment list), the process is generally the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for any residual power to discharge.
- Locate the Old PCM: On most trucks like the 1999-2000 Chevrolet 2500 Pickup, it’s in the engine compartment on the driver’s side. On Express/Savana vans, it’s often in the rear of the engine compartment. For S10/Blazer models, check the passenger side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. They have locking tabs, so be gentle to avoid damage. Note their color and orientation.
- Remove the Module: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Bolt the new module into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Re-attach the negative battery terminal. The vehicle may need to run for a few minutes to complete its internal relearn procedures. That’s it—you’re ready to go!
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your vehicle is on this list and, if noted, that your original module has the ID 16263494. This part replaces service numbers: 16263494, 16265035, 8162634940, 218-11787.
GMC 1500/2500/3500 PICKUP (99-00), ENVOY (98-00), JIMMY S15 (98-00), SAFARI (99-01), SAVANA 1500/2500/3500 VAN (99-02), SIERRA 1500 (99-00), SONOMA (98-00), YUKON (99-00)
CADILLAC ESCALADE (99-00)
ISUZU HOMBRE (98-00)
OLDSMOBILE BRAVADA (98-00)
Note: Some 1998 models require build date option ZN4. Please check your service parts sticker.
Do I need to program this module?
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM software for your specific vehicle. It arrives ready to install.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is your car’s unique 17-digit serial number. You can find it on a plate on the driver’s side dashboard (viewable through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
How do I know if this is the right part number for me?
This module, 218-11787, is a direct replacement for several part numbers, including 16263494 and 16265035. The best way to confirm is to check the number on your original module’s sticker. If your vehicle is on our fitment list, this part is guaranteed to be compatible.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls engine performance and transmission shift points. If the module is failing, it can send incorrect signals, leading to harsh or delayed shifts. Replacing a faulty PCM often resolves these types of electronic transmission issues.
Is any other setup required after installation?
For most vehicles, no additional steps are needed. However, some models may require a security relearn procedure (often called CASE relearn or Passlock relearn) to sync the new PCM with the vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions can be easily found online for your specific model.