Restore Peak Performance to Your GM Truck or Van
If you’re battling a persistent check engine light, experiencing frustrating intermittent stalling, or noticing a sudden drop in fuel economy in your truck, the culprit is often the vehicle’s central computer—the Powertrain Control Module (PCM). As a seasoned technician, I’ve seen firsthand how a failing PCM can create a cascade of baffling issues. This isn’t just a part; it’s the brain of your engine and transmission, and when it falters, your vehicle’s reliability is on the line. This replacement module is the definitive solution, arriving at your door fully programmed with the latest GM software updates specific to your vehicle’s VIN.
Case Study: The Ghost in the Machine
I remember a 2000 Chevy 2500 work truck that came into my shop. The owner was at his wit’s end. The truck would randomly refuse to start—no crank, no click. Other times, it would stall at a red light. He’d replaced the battery, starter, and alternator, but the problem persisted. We scanned it and found no active codes, a classic sign of an intermittent electronic issue. After checking the grounds and power feeds to the PCM, we decided to swap it. With the new, pre-programmed PCM installed, the truck fired up instantly. The ghost was gone. The internal circuitry of the old module was failing under certain temperature conditions, a common failure point I’ve diagnosed on hundreds of these GM vehicles. This replacement 1999-2000 GMC 3500 PCM is the same fix that got that workhorse back on the job.
Is Your Truck Showing These Signs of a Failing PCM?
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:
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- ✔ Engine stalls for no apparent reason or has difficulty starting.
- ✔ Noticeable decrease in fuel mileage.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The engine runs rough, misfires, or hesitates on acceleration.
- ✔ Failure to pass an emissions/smog test.
A Straightforward Guide to Installation
One of the biggest advantages of this module is that it arrives ready to install, with no dealer visit required. The process is simple enough for a confident DIYer.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most 1999-2000 GMC/Chevy pickups, the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. For vans, it’s often in the rear of the engine compartment.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors from the old PCM. There are typically release tabs that need to be pressed or lifted.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed 1999-2000 GMC 3500 PCM into place.
- Reconnect Everything: Firmly plug the harness connectors into the new module until they click. Reconnect the negative battery terminal.
- Final Step: Your vehicle may need to go through a security relearn procedure, which is a simple process you can typically do in your driveway. Instructions are readily available online for your specific model.
By purchasing this pre-programmed 1999-2000 GMC 3500 PCM, you are not just buying a part; you are investing in a reliable, cost-effective solution that restores your vehicle’s core functionality and gives you peace of mind on the road.
Verified Fitment For These GM Models
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 218-11787. Please verify your vehicle is on this list before ordering. We program the module specifically for your VIN.
CHEVROLET 3500 PICKUP 99-00 (gasoline)
GMC 2500 PICKUP 99-00 (gasoline)
GMC 3500 PICKUP 99-00 (gasoline)
EXPRESS/SAVANA 1500 VAN 99-02
EXPRESS/SAVANA 2500 VAN 99-02 (gasoline)
EXPRESS/SAVANA 3500 VAN 99-02 (gasoline)
ASTRO/SAFARI VAN 99-01 (4.3L)
S10/S15/SONOMA 98-00 (4.3L)
BLAZER/JIMMY 98-00 (4.3L)
BRAVADA 98-00 (4.3L)
ENVOY 98-00
ISUZU HOMBRE 98-00 (4.3L)
SILVERADO/SIERRA 1500 99-00 (4.3L V6 only)
CHEVROLET/GMC 1500 PICKUP 99 (5.0L, 5.7L)
TAHOE/YUKON 99-00 (Classic/Denali)
SUBURBAN 1500/2500 99 (gasoline)
ESCALADE 99-00
Note: Some models require matching the ID number 16263494. Please check your original part.
Frequently Asked Questions
Do I need to program this module?
No. This is the biggest benefit. We flash the module with the latest GM software using the VIN you provide during checkout. It arrives ready for installation.
What information do you need from me?
After your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your truck or van. This ensures we load the exact correct software for your vehicle’s options.
Where is the PCM located on my 2000 GMC 3500 Pickup?
For your specific truck, the PCM is located in the engine bay on the driver’s side (LH side) near the firewall and master cylinder.
Will this fix my specific problem?
This module will resolve any issue directly caused by a faulty PCM. If your vehicle has symptoms like stalling, no-start conditions, or specific internal processor error codes (like P0601), this is the most likely solution.
Is this part compatible with other numbers?
Yes, this module, 218-11787, is a direct replacement for several OEM part numbers, including 16263494 and 16265035. This ensures broad compatibility across many GM models.