Restore Peak Performance to Your Truck or Van
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle. It manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. This replacement module, part number 16263494, is the definitive solution for a wide array of late 90s and early 2000s GM trucks and vans, including the 1998-2000 Isuzu Hombre.
Unlike a generic part from a local store, this PCM is delivered to you fully programmed with the latest GM software updates. We use your vehicle’s unique Vehicle Identification Number (VIN) to ensure the module is a perfect match, eliminating the need for expensive dealership programming. This makes for a straightforward, plug-and-play installation process that gets you back on the road quickly and reliably.
From the Diagnostic Bay
We had a 1999 GMC Jimmy come into the shop with a persistent, random misfire on cylinder 3. The owner had already replaced the spark plug, wire, distributor cap, and rotor. He even swapped the fuel injector. The misfire would come and go, and no one could figure it out. After hooking up our diagnostic scope, we noticed the control signal for the #3 injector was occasionally dropping out. The wiring was fine, which led us straight to the PCM. The internal driver for that injector was failing intermittently. We installed a VIN-programmed module just like this one, performed the necessary security relearn, and the Jimmy ran perfectly. It’s a classic example of how a failing PCM can mimic other component failures, costing you time and money on parts you don’t need.
Is Your Isuzu Hombre PCM Failing?
A faulty powertrain module can manifest in numerous ways. If you’re experiencing any of the following symptoms, a failing computer could be the culprit. This unit is the correct fix for these common problems.
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Rough or erratic engine idling.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or delayed transmission shifting.
- ✔ Engine stalling or cutting out while driving.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
The Importance of VIN Programming
Modern vehicles are complex, and the PCM is tailored to the specific options and systems your truck was built with. Everything from the engine and transmission type to the axle ratio and tire size is stored in the module’s calibration file. By programming this unit with your VIN, we ensure all these parameters are correct. Installing a non-programmed or incorrectly programmed module can lead to check engine lights, improper transmission operation, and even prevent the vehicle from starting due to anti-theft system conflicts. Our service takes the guesswork out of the repair, providing a reliable and effective solution.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify the part number on your original module to confirm compatibility.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN after purchase, and the module will arrive ready for installation.
What is a security or CASE relearn?
After installation, you may need to perform a simple procedure to sync the new PCM with your vehicle’s anti-theft (Passlock/VATS) system. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. A Crankshaft Variation (CASE) relearn may also be needed, which requires a capable scan tool to complete.
Where is the PCM located on my vehicle?
The location varies. On S-10 platform trucks like the Isuzu Hombre, GMC Sonoma, and Chevy Blazer, it’s typically in the engine bay on the passenger side fender. On full-size trucks and vans like the Silverado, Sierra, and Express, it’s often on the driver’s side, sometimes under the battery tray or on the inner fender.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. You can find your VIN on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this compatible with vehicles other than the Isuzu Hombre?
Yes. This PCM is compatible with a very wide range of GM trucks and vans from approximately 1998 to 2002 equipped with the 4.3L, 5.0L, and 5.7L gasoline engines. Please refer to the detailed fitment list on this page to confirm it matches your specific year, make, and model.