Is Your GM Truck or Van Running Rough?
If your GMC Savana, Chevrolet Express, or another compatible GM vehicle is suffering from erratic engine behavior, poor fuel economy, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) could be the culprit. This central computer is the brain of your vehicle’s engine and transmission, and when it falters, it can cause a host of frustrating and difficult-to-diagnose problems. Don’t let a faulty module keep you off the road. This replacement PCM, part number 16263494, is the reliable, straightforward solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
I once had a 2000 Chevy S10 with the 4.3L V6 come into the shop with the most bizarre intermittent stalling issue. The owner had replaced the fuel pump, ignition coil, and even the distributor, but the truck would still randomly die at stoplights. No codes were stored. After hours of chasing wires and checking grounds, we hooked up a scope to the PCM outputs. We found that the injector driver circuit inside the module would occasionally drop out for a split second, just long enough to kill the engine. We installed a VIN-programmed replacement PCM, and the problem was solved instantly. Sometimes, the most elusive gremlins live inside the computer itself.
Symptoms of a Failing GM ECM 16263494
- ✔ Persistent and illuminated Check Engine Light
- ✔ Engine stalling, misfiring, or running rough
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A sudden, unexplained drop in fuel efficiency
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with diagnostic scan tools
- ✔ Failure to pass state emissions testing
The Plug-and-Play Solution
Replacing an engine computer used to mean a trip to the dealership for expensive programming. Our process eliminates that hassle. When you purchase this module, we ask for your vehicle’s Vehicle Identification Number (VIN). Our technicians then use that VIN to flash the unit with the latest, most up-to-date software directly from GM. This ensures that the module is perfectly calibrated for your vehicle’s specific engine, transmission, and options package. The result is a true plug-and-play component. In most cases, you simply disconnect the old module, connect the new one, and you’re ready to go.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and vans from the late 1990s and early 2000s. It is compatible with multiple service numbers, including 16263494, 16265035, and 8162634940. Whether you’re driving a Chevrolet Silverado, GMC Sierra, Chevy Blazer, or an Isuzu Hombre with the 4.3L V6, this module is engineered to restore factory performance. Please verify your part number and consult the detailed fitment list to ensure this is the correct part for your vehicle.
Frequently Asked Questions
Do I need to have this module programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle.
What is the difference between an ECM and a PCM?
ECM stands for Engine Control Module and PCM stands for Powertrain Control Module. For these GM vehicles, the terms are often used interchangeably. The PCM is a more accurate term as this single unit controls both the engine and the transmission functions.
Where is my VIN located?
Your 17-digit VIN can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Will I need to perform a security relearn procedure?
For many vehicles of this era, a simple security relearn procedure (often called a CASE relearn or Passlock relearn) may be necessary after installation. This procedure is straightforward and can be done without special tools. It typically involves cycling the ignition key and waiting for a few minutes. Instructions are readily available online for your specific model.
Is this a new or used part?
This is a high-quality, tested replacement part guaranteed to function correctly. It is programmed with the latest software to ensure optimal performance and longevity, restoring your vehicle to its original operating standards.