Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, harsh transmission shifting, or even a no-start condition in your Chevrolet Astro, Express, Silverado, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your vehicle’s engine and transmission, the PCM’s health is critical for performance, fuel economy, and reliability. When it starts to fail, it can cause a cascade of frustrating and difficult-to-diagnose issues. Don’t let a faulty computer keep you off the road. This direct-replacement PCM is the definitive solution to restore your vehicle’s factory performance.
From the Diagnostic Bay
We had a 2000 Chevy Express 2500 work van come into the shop with a complaint that was driving the owner crazy. It would randomly stall at stoplights and sometimes refuse to start after being parked for an hour. The transmission would also slam into gear intermittently. The check engine light was on, but the codes were all over the place—misfire codes, transmission solenoid codes, O2 sensor codes. After chasing our tails checking wiring and sensors, we hooked up a scope to the PCM’s main power and ground circuits. We found the internal voltage regulation was dropping out sporadically, causing the processor to reset. This explained all the ghost-like symptoms. We installed one of these VIN-programmed PCMs, performed the security relearn, and the van ran like it just rolled off the assembly line. It’s a classic case of a failing computer causing symptoms that look like a dozen other problems.
Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various fault codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent or complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for Your 1999-2001 Astro PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle in replacing a modern vehicle computer is the need for expensive, dealer-specific programming. We eliminate that step entirely. When you order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then program the module with the latest, most up-to-date software directly from GM for your specific vehicle configuration. This ensures that all engine, transmission, and emissions parameters are perfectly calibrated, just as the factory intended. This process makes the installation straightforward, saving you time and the high cost of a visit to the dealership’s service department.
This module is a direct replacement for several original equipment part numbers, including 16263494, 16265035, and 8162634940. It is essential to verify the part number on your existing module to ensure compatibility. Once installed, you may need to perform a simple security relearn procedure (often called a CASE relearn), which can typically be done without special tools and instructions are widely available.
Frequently Asked Questions
Do I need to get this module programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and the module will arrive ready for installation, loaded with the correct software for your vehicle.
Is this a plug-and-play part?
Yes, for the most part. Because it is programmed to your VIN, it will communicate with your vehicle’s systems immediately. However, on many GM vehicles of this era, you may need to perform a security relearn or Crankshaft Variation Relearn (CASE) procedure to sync the new PCM with the security system and crankshaft position sensor. This procedure can often be done without special tools.
How do I find the part number on my old PCM?
Your vehicle’s PCM is typically located in the engine bay. On a Chevy Astro, it’s often on the driver’s side near the battery. Look for a large silver box with multiple wiring harness connectors. The part number will be printed on a sticker on the module’s case. It will usually be a prominent 8-digit number like 16263494.
Will this fix my check engine light?
If the check engine light and associated fault codes are being caused by a faulty PCM, then yes, this part will resolve the issue. It is crucial to have the vehicle properly diagnosed to confirm the PCM is the point of failure before ordering.
What vehicles is this module compatible with?
This PCM fits a wide range of late 90s and early 2000s GM trucks and vans, including the Chevy Astro, Blazer, S10, Express, Silverado, Tahoe, GMC Safari, Jimmy, Sonoma, Savana, Sierra, Yukon, and more. Please refer to the detailed fitment list on this page to confirm compatibility with your specific year, make, and model.