Is your Chevrolet Astro, Express Van, Silverado, or another compatible GM vehicle suffering from perplexing issues like erratic shifting, poor engine performance, or a persistent check engine light? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This essential component manages everything from fuel injection and ignition timing to transmission shift points. When it fails, it can cause a cascade of problems that are frustrating and difficult to diagnose. Restore your vehicle’s reliability and performance with our professionally programmed PCM, a direct-fit solution for part number 16263494.
Unlike a generic module from a parts store or salvage yard, this PCM is not just a replacement part; it’s a complete solution. We program each module specifically to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that the PCM has the correct software and calibrations for your engine, transmission, and factory options. We install the latest GM-authorized software updates, which can resolve factory bugs and improve overall drivability and efficiency. This means you get a module that is ready to install right out of the box, saving you a costly trip to the dealership for programming.
Diagnosing a Faulty Powertrain Control Module
A failing PCM can mimic a wide variety of other mechanical problems, making diagnosis tricky. If you’ve checked sensors and other components without success, it’s time to consider the module itself. The symptoms often start intermittently and worsen over time. Look for communication error codes (U-codes) with a professional scan tool, as this is a strong indicator that the PCM is not communicating correctly with other modules in the vehicle. Ignoring these signs can lead to further component damage, failed emissions tests, and even a vehicle that won’t start at all.
From the Diagnostic Bay
We had a 2000 Chevy Express 2500 van come into the shop with a complaint of harsh, unpredictable shifting and what the owner described as ‘transmission slipping.’ He was convinced he needed a full transmission rebuild, a multi-thousand dollar job. Before quoting the work, we connected our diagnostic scanner. We found no specific transmission solenoid codes, but we did find several U-codes, indicating a loss of communication with the PCM. On a hunch, we inspected the module and found signs of corrosion on the case. We installed one of our VIN-programmed PCMs, performed the security relearn, and the van drove perfectly. The transmission was fine all along; the faulty brain was giving it bad commands. This simple swap saved the customer a fortune and a lot of headaches.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) illumination.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but will not fire.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Inability to pass state emissions inspections.
Why Choose Our Programmed 1999-2001 Astro PCM?
This isn’t just a replacement part; it’s a restoration of your vehicle’s core logic. Our process is designed for both professional technicians and savvy DIYers. By providing us with your VIN during checkout, you ensure that the 1999-2001 Astro PCM you receive is precisely matched to your vehicle’s specifications. This plug-and-play approach eliminates the need for expensive dealer-only tools. The module arrives ready for installation, and in most cases, the only additional step is a simple security relearn procedure that you can perform yourself in about 15 minutes without any special tools. This module is a reliable and cost-effective way to get your truck or van back on the road and running as it should.
This PCM is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. It fits a vast range of popular GM trucks and vans from the late 1990s and early 2000s, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, S10, Blazer, and many more. Please verify the part number on your original module and consult the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Why do you need my vehicle’s VIN?
Your VIN (Vehicle Identification Number) allows us to program the PCM with the exact software and calibrations specific to your vehicle’s engine, transmission, and factory options. This ensures perfect compatibility and function right out of the box.
Is this module difficult to install?
Installation is straightforward for anyone with basic mechanical skills. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in reverse order. The module is usually located in the engine bay.
Will I need to do anything after installation?
Yes, you will likely need to perform a security relearn procedure (also known as a CASE relearn or Passlock relearn). This syncs the new PCM with your vehicle’s anti-theft system. The procedure is simple and can be done without special tools by following instructions included with the part.
How can I be sure this part fits my vehicle?
The best way is to match the part number 16263494 (or one of the compatible numbers listed) to the number on your original module. You can also use the detailed fitment list on this page to check your make, model, and year.
Is this a new or used part?
This is a high-quality, inspected, and tested component that has been programmed with the latest software for your vehicle. It is guaranteed to restore your vehicle’s original functionality.