Is Your GM Truck or Van Running Rough?
If you’re dealing with a frustrating no-start condition, a persistent check engine light, erratic transmission shifting, or poor fuel economy in your 1999-2000 Silverado 1500, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM starts to go, it can cause a cascade of confusing and seemingly unrelated issues. After 20+ years of heat, vibration, and countless electrical cycles, the original electronics are simply at the end of their service life.
From the Shop Floor: A Real-World Diagnosis
“A customer’s ’99 Silverado 1500 with the 4.3L V6 came into the shop last month. It would crank but not start, and when it occasionally did, it ran horribly and the transmission would slam into gear. The owner had already replaced the fuel pump and ignition coil with no luck. After hooking up my scan tool, I saw multiple communication loss codes and erratic sensor data. A quick check of the PCM connectors confirmed they were clean and secure. This is a classic textbook case of internal PCM failure. We installed one of our pre-programmed modules, performed the security relearn, and the truck fired right up and ran perfectly. It’s a fix I’ve done hundreds of times on these GM platforms.”
The Guaranteed, Programmed Solution
Don’t waste time and money chasing phantom issues. This Powertrain Control Module is the definitive solution to get your vehicle running reliably again. The biggest challenge with replacing a PCM isn’t the physical installation; it’s the complex software programming required to make it communicate with your specific vehicle. We handle that for you.
When you purchase this module, we will flash it with the latest official GM software calibration specifically for your truck’s Vehicle Identification Number (VIN). This ensures all factory settings for the engine, transmission, and emissions systems are perfectly matched, just as it came from the factory.
Key Benefits of Our VIN Programming Service:
- โ Eliminates Costly Dealership Visits: No need to pay expensive dealer labor rates for programming. Your module arrives ready for installation.
- โ Restores Original Performance: Corrects issues like harsh shifting, poor idling, stalling, and inaccurate fuel/air mixtures that cause check engine lights.
- โ Plug-and-Play Installation: Once installed, you may only need to perform a simple security relearn procedure, which doesn’t require any special tools.
- โ Latest GM Software: We load the most current GM updates, which can solve drivability problems the original software may have had.
Installation and Compatibility
Physically replacing the PCM is straightforward. On most 1999-2000 Silverado and Sierra models with the V6, it’s located under the battery tray on the driver’s side. Always disconnect the negative battery terminal before starting work. After installation, you will likely need to perform a security relearn (often called a VATS or Passlock relearn). A common procedure is to turn the key to the ‘ON’ position for 10-15 minutes, then off for 10 seconds, and repeat this cycle three times. Your vehicle’s specific procedure can easily be found online or in a service manual.
This Module is a Direct Replacement For:
- โ Part Numbers: 16263494, 16265035, 8162634940, 218-11787, 21811787
- โ Primary Fitment: 1999-2000 Chevrolet Silverado 1500 & GMC Sierra 1500 with 4.3L V6 engine.
- โ Broad Compatibility: Also fits a wide range of other GM trucks, vans, and SUVs from approximately 1998-2002. Please verify your part number or use the fitment chart to confirm compatibility with your specific vehicle and options.
Provide us with your VIN at checkout, and we’ll handle the rest. Get your truck back on the road with confidence.