Programmed 1999-2000 Silverado 1500 PCM 16263494 | VIN-Matched | GM Updates

Restore Peak Performance to Your GM Truck or Van

As a technician with over two decades of experience under the hood, I’ve seen my fair share of GM trucks and vans from this era come into the bay with puzzling issues. Erratic idling, poor fuel mileage, harsh shifting, or a persistent Check Engine Light can often be traced back to one component: a failing Powertrain Control Module (PCM). This isn’t just a part; it’s the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shift points. When it starts to fail, your reliable workhorse can become a source of constant frustration.

This isn’t just a replacement part; it’s a definitive solution. We are offering a high-quality Powertrain Control Module, direct-fit for part number 16263494, which comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). Before we ship it, our specialists load it with the latest official software updates from General Motors. This process ensures your engine and transmission operate with the most current logic for optimal efficiency, emissions, and performance—something a generic or junkyard part simply cannot offer.

Is Your GM Truck or Van Showing These Symptoms?

A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module is a likely culprit. Confirming your diagnosis is the first step to a successful repair.

• ✔ Persistent Check Engine Light (CEL)
• ✔ Diagnostic Trouble Codes (DTCs) stored, especially P0601, P0604, or P0606
• ✔ Vehicle refuses to start or has intermittent starting issues
• ✔ Poor or declining fuel economy
• ✔ Erratic or harsh automatic transmission shifting
• ✔ Engine stalling, sputtering, or misfiring
• ✔ Failure to pass state emissions testing

A Straightforward Guide to Your PCM Swap

Installing your new 1999-2000 Silverado 1500 PCM is a manageable job for a confident DIYer. Taking your time and following these steps will ensure a smooth process. The location can vary slightly (see fitment list), but the procedure is similar across models.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental power surges.
2. Locate the PCM: On most trucks like the Silverado, Tahoe, and Sierra, it’s in the engine compartment on the driver’s side, often near the battery or firewall. On Express/Savana vans, it’s typically in the rear of the engine compartment.
3. Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors. These can be brittle, so use a small flathead screwdriver to gently pry if needed. Pull the connectors straight out from the module.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
5. Install the New Module: Mount your new, pre-programmed PCM securely onto the bracket. Reconnect the electrical harnesses, ensuring they click firmly into place and the locking tabs are engaged.
6. Reconnect the Battery: Reattach the negative battery terminal.
7. Perform Security Relearn: Your vehicle may require a security relearn procedure (often called a CASE learn) to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s service manual for the exact procedure.

Verified Vehicle Compatibility

This module is a direct replacement for part number 16263494 and is also compatible with part numbers 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on this list and that your original part number matches.