Restore Peak Performance to Your GM Truck or Van
If your trusty 1999-2000 GMC 2500 Pickup is suffering from frustrating issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel mixture and ignition timing to transmission shift points. When it falters, the entire vehicle’s performance suffers. This replacement Powertrain Control Module is the definitive solution, arriving at your door pre-programmed with the latest GM software updates specifically for your vehicle’s VIN.
From the Diagnostic Bay: The Ghost in the Transmission
I once had a 2000 Chevy Express van in the shop that was giving the owner fits. It was shifting hard between first and second gear and occasionally throwing a code for a transmission solenoid. The owner had already replaced the solenoid twice with no change. He was convinced his transmission was shot. When I hooked up my scanner, I noticed the voltage readings from the PCM to the transmission were fluctuating erratically, something you wouldn’t normally see with just a bad solenoid. On a hunch, we swapped in a known-good, correctly programmed PCM. The hard shifting vanished instantly, and the ghost code never returned. It’s a classic case I’ve seen dozens of times: a failing PCM creating symptoms that point elsewhere. This is why a reliable, correctly programmed 1999-2000 GMC 2500 PCM isn’t just a part—it’s a diagnostic solution.
Is Your Vehicle Showing These Telltale Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Persistent Check Engine Light (CEL)
- âś” Diagnostic Trouble Codes (DTCs) such as P0601 (Internal Memory Error) or P0606 (PCM Processor Fault)
- âś” Vehicle refuses to start or stalls intermittently
- âś” Harsh or erratic automatic transmission shifting
- âś” A noticeable drop in fuel economy
- âś” Engine misfires or rough idling
- âś” Failure to pass an emissions inspection
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in their own driveway. Our pre-programming service eliminates the need for expensive dealer tools. Just follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most trucks like the GMC 2500, it’s found in the engine compartment on the driver’s side, often near the battery or firewall. On vans like the Express/Savana, it’s typically in the LH rear engine compartment.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before they can be pulled away. Avoid forcing them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. There are usually two or three bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): On many of these GM vehicles, you will need to perform a simple key-cycle security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle should then start normally.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for multiple part numbers and fits a wide range of GM trucks, vans, and SUVs. Please verify your vehicle is on this list and, if possible, match the ID number on your existing module (e.g., 16263494) to ensure perfect compatibility. This module is a verified fit for the following vehicles:
1999-2000 GMC 2500 PICKUP (Gasoline, LH front engine compartment)
Fits many other models including: Chevrolet Silverado, Suburban, Tahoe, Express Van; GMC Sierra, Yukon, Savana Van; Cadillac Escalade; Oldsmobile Bravada; Isuzu Hombre, and more from 1998-2002. Please see the full compatibility list provided in the initial data for all specific applications.
Frequently Asked Questions
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. We use your Vehicle Identification Number (VIN) to load the correct, factory-issued software and updates for your specific engine, transmission, and options. This ensures seamless, plug-and-play operation.
Will this fix my specific problem?
This module is a direct solution for issues caused by a faulty PCM, such as internal processor errors (P0601, P0606), and erratic engine or transmission behavior. While it resolves many common problems, you should always ensure your vehicle has been properly diagnosed.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system. It requires no special tools, just your ignition key. We include easy-to-follow instructions for this procedure with your order.
Is this a brand new part?
This is a high-quality, fully tested replacement part that has been expertly serviced and programmed to meet or exceed original equipment specifications. It is guaranteed to restore your vehicle’s functionality.