Is Your GM Truck or Van Experiencing Mysterious Issues?
If your Chevrolet Astro, Express, Silverado, or other compatible GM vehicle is suffering from a persistent Check Engine Light, erratic engine behavior, poor fuel economy, or transmission shifting problems, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your vehicle, the PCM orchestrates everything from fuel delivery and spark timing to transmission shift points. When it begins to fail, it can create a cascade of frustrating and difficult-to-diagnose issues.
From the Diagnostic Bay
We had a 2000 Chevy Express 2500 work van come into the shop that was driving the owner crazy. It would run perfectly for 20 minutes, then suddenly stall at a stoplight and refuse to restart for an hour. He had replaced the fuel pump, crank sensor, and ignition coil, but the problem persisted. After hooking up our scanner and monitoring live data, we noticed the 5-volt reference signal to the sensors would drop out just before the stall. This pointed directly to an internal failure in the PCM. We installed one of these VIN-programmed modules, performed the security relearn, and the van was back on the road, reliable as ever. The problem was solved not by throwing more parts at it, but by addressing the vehicle’s brain.
The Plug-and-Play Solution for Your Drivability Problems
Don’t let a faulty computer keep your vehicle off the road. This Powertrain Control Module is the definitive solution, arriving at your door pre-programmed with the latest official GM software updates tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This critical programming step ensures that the module communicates perfectly with your engine, transmission, and all related systems, restoring original factory performance and reliability right out of the box. You get a reliable, tested component without the exorbitant cost and hassle of a dealership visit.
Symptoms and Features of this 1999-2001 Astro PCM
- ✔ Eliminate Check Engine Lights: Clears persistent diagnostic trouble codes (DTCs) related to module failure.
- ✔ Restore Smooth Operation: Fixes issues like rough idling, engine stumbling, hesitation, and stalling.
- ✔ Correct Transmission Shifting: Resolves harsh shifting, delayed engagement, or incorrect gear selection.
- ✔ Improve Fuel Economy: A properly functioning PCM ensures the optimal air/fuel mixture for maximum efficiency.
- ✔ Pre-Programmed to Your VIN: No need for expensive dealer tools. This module is ready for installation upon arrival. Just provide your VIN after purchase.
- ✔ Direct OEM Fit: Designed to replace part numbers 16263494, 16265035, and 8162634940 for a perfect fit and function.
Simple Installation Process
Replacing the PCM is a straightforward job for a DIY mechanic. It is typically located in the engine bay (on the driver’s side near the battery on an Astro/Safari, or on the passenger side firewall on an S10/Blazer). Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. After reconnecting everything, you may need to perform a simple security relearn procedure (often called a Passlock relearn), which can be done without any special tools. This procedure syncs the new PCM with your vehicle’s anti-theft system.
What exactly does the PCM do?
The Powertrain Control Module (PCM) is the main computer that controls your vehicle’s engine and transmission. It takes data from dozens of sensors to manage fuel injection, ignition timing, emissions systems, and automatic transmission shift patterns to ensure optimal performance, fuel efficiency, and low emissions.
Is this module truly plug-and-play?
Yes, it is. We program the module with your vehicle’s specific VIN and the latest GM software before it ships. This ensures it works correctly with your exact configuration. In most cases, the only additional step is a simple, tool-free security relearn procedure that takes about 30 minutes to sync the module to your keys.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we have this information, as the programming is essential for the part to function.
Will this fix my no-start problem?
A failed PCM is a common cause of a ‘crank, no start’ condition where the engine turns over but won’t fire up. If you’ve ruled out other common culprits like the fuel pump or ignition system, a faulty PCM is a very likely cause. This part is designed to resolve such issues.
What if I order the wrong part?
This module fits a very wide range of GM trucks and vans from the late 90s and early 2000s. Please check the compatibility list on this page and match your original part number (e.g., 16263494) to ensure a correct fit. Programming with your VIN also helps us catch any potential compatibility issues before we ship.