Restore Your Truck’s Brain and Get Back on the Road
Is your 1999 or 2000 Silverado 1500 giving you headaches? Unexplained stalling, rough idling, poor fuel economy, or a persistent Check Engine Light are more than just annoyances—they’re often signs that the heart of your engine management system, the Powertrain Control Module (PCM), is failing. As the central computer, the PCM controls everything from fuel mixture and spark timing to transmission shift points. When it falters, your truck’s performance and reliability suffer.
This isn’t just a replacement part; it’s a complete solution. We provide a high-quality PCM that is professionally programmed with the latest official GM software updates, specifically matched to your vehicle’s unique VIN. This critical step ensures seamless communication with your truck’s other systems, restoring its original performance and efficiency without a costly trip to the dealership for programming. Simply provide your VIN at checkout, and we handle the rest, shipping you a module that’s ready for installation right out of the box.
Case Study: A Tricky Diagnosis
I remember a 2000 Silverado 4.3L V6 that came into my shop with a frustrating, intermittent no-start condition. The owner had already replaced the battery, starter, and fuel pump. It would run fine for days, then refuse to start, with no spark and no fuel pressure. After hours of chasing wires, we checked the PCM’s power and ground signals—they were solid. Yet, the module itself was failing internally only when it heated up. We swapped in a VIN-programmed PCM like this one, and the truck fired up instantly. The problem never returned. It’s a classic example of how a failing PCM can mimic other component failures, making a direct-fit, programmed module the most effective fix.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, your engine computer could be the culprit:
- âś” Check Engine Light is illuminated, often with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- âś” The engine cranks but refuses to start.
- âś” Unexplained stalling or rough, inconsistent idling.
- âś” Noticeable decrease in fuel mileage.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to pass an emissions test.
- âś” Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing the PCM on your Silverado is a manageable job for a DIYer. On most 1999-2000 models with the V6 engine, it’s located under the battery tray. Follow these general steps to get your truck running smoothly again.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the PCM: Find the module in the engine bay. For many Silverados, this involves removing the battery and the battery tray to access it.
- Disconnect the Connectors: Carefully unplug the electrical wiring harnesses from the old PCM. These connectors have locking tabs that must be released before they can be removed. 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 it for the new module.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reinstall the battery tray and battery, then reconnect the negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary. 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.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to fit a wide range of GM trucks and vans. Please verify your vehicle and original part number below:
CHEVROLET/GMC C/K 1500/2500/3500 PICKUP 99-00 (Gasoline, LH engine compartment)
CHEVROLET TAHOE / GMC YUKON 99-00 (Classic Style, LH engine compartment)
CHEVROLET SUBURBAN 1500/2500 99 (Gasoline, LH engine compartment)
CADILLAC ESCALADE 99-00 (LH front under battery/engine compartment)
GMC SIERRA 1500 PICKUP 99-00 (6 cylinder, LH front under battery)
CHEVROLET S10 / GMC SONOMA 98-00 (4.3L V6, RH front engine compartment)
CHEVROLET BLAZER / GMC JIMMY 98-00 (RH front engine compartment)
OLDSMOBILE BRAVADA / GMC ENVOY 98-00 (RH front engine compartment)
CHEVROLET ASTRO / GMC SAFARI 99-01 (ID 16263494, LH front by battery)
CHEVROLET EXPRESS / GMC SAVANA 1500/2500/3500 VANS 99-02 (Gasoline, LH rear engine compartment)
ISUZU HOMBRE 98-00 (4.3L V6, RH front engine compartment)
…and other models matching part number 16263494.
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to access the latest GM factory software and flash the module specifically for your truck’s engine, transmission, and options. This ensures it works perfectly upon installation.
Is any additional programming required after I install it?
No. Because we program the module to your VIN before shipping, you will not need to take it to a dealer or mechanic for further programming. In some cases, a simple security relearn procedure (turning the key on/off) is needed, which you can easily do yourself.
How do I find my original part number?
The part number is printed on a sticker on the case of your existing PCM. You can cross-reference it with the compatible numbers listed here (16263494, 16265035, etc.) to confirm a match.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty signals from the PCM, then yes, this part is very likely to solve the problem. The PCM controls transmission line pressure and shift solenoids, so a failing module often results in poor shifting performance.
Do I need to send my old PCM back (core charge)?
This listing does not require a core return. You can keep your old module, which saves you the time and expense of shipping it back.