Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC 3500 or another GM vehicle acting up? If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty engine computer can create a cascade of problems that are difficult to diagnose. This isn’t just a part; it’s the central command center for your engine and transmission. This replacement PCM is your direct, reliable solution to get your vehicle running smoothly and efficiently again.
We take the guesswork and hassle out of the replacement process. Unlike sourcing a part from a salvage yard that requires expensive dealership programming, this module arrives at your door flashed with the latest GM factory software, specifically matched to your vehicle’s Vehicle Identification Number (VIN). This ensures perfect communication between all your vehicle’s systems, restoring original performance and fuel economy. Simply provide your VIN after purchase, and we’ll handle the complex programming for you, making the installation a true plug-and-play experience.
Real-World Repair Story
Real-World Repair Story
A few months back, a 2000 Chevy Express 2500 work van was towed into my shop. The owner, a plumber, was at his wit’s end. The van would run fine for a week, then suddenly start stalling at traffic lights and shifting harshly. He’d already replaced the fuel pump and a few sensors with no luck. The only consistent code was a P0606 (ECM/PCM Processor Fault), but it was intermittent. After verifying the wiring harness and grounds were solid, we pinpointed the PCM. The internal processor was failing under thermal stress. We installed a VIN-programmed module just like this one, and the van has been running flawlessly ever since. It’s a classic example of how a failing 1999-2000 GMC 3500 PCM can mimic other component failures.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault)
- ✔ Engine cranks but refuses to start
- ✔ Unexplained drops in fuel economy
- ✔ Rough or unstable idling
- ✔ Engine stalling or hesitation during acceleration
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the PCM on these GM vehicles is a job most DIYers can handle in their own driveway. Our VIN programming service eliminates the need for special scan tools for setup. Just follow these basic steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most trucks and vans covered here, the PCM is located in the engine compartment, often on the driver’s side inner fender or near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that need to be released before they can be unplugged. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New PCM: Mount your new, pre-programmed module in place and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses back into the new PCM until they click securely in place. Reconnect the negative battery terminal.
- Perform Security Relearn: For many of these vehicles, you will need to perform a 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.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of popular GM trucks, SUVs, and vans. It is compatible with part numbers 16263494, 16265035, and 8162634940. Please verify your vehicle is on this list and, if noted, that your original module carries the ID 16263494 for a guaranteed fit. This part is engineered to work with gasoline engines in the following models:
This module fits many vehicles including the 1999-2000 GMC 3500 PCM, Chevrolet Silverado 1500, GMC Sierra 1500, Tahoe, Yukon, Suburban, Escalade, S10/S15 Blazer and Jimmy, Astro/Safari vans, and Express/Savana cargo and passenger vans from approximately 1998 to 2002. Please consult the detailed fitment list provided on this page to confirm your specific year, model, and engine combination.
Frequently Asked Questions
Real-World Repair Story
A few months back, a 2000 Chevy Express 2500 work van was towed into my shop. The owner, a plumber, was at his wit’s end. The van would run fine for a week, then suddenly start stalling at traffic lights and shifting harshly. He’d already replaced the fuel pump and a few sensors with no luck. The only consistent code was a P0606 (ECM/PCM Processor Fault), but it was intermittent. After verifying the wiring harness and grounds were solid, we pinpointed the PCM. The internal processor was failing under thermal stress. We installed a VIN-programmed module just like this one, and the van has been running flawlessly ever since. It’s a classic example of how a failing 1999-2000 GMC 3500 PCM can mimic other component failures.