Restore Your Truck’s Core Performance with a Plug-and-Play PCM
Is your 1998 Isuzu Hombre or GM truck acting up? Dealing with a persistent Check Engine Light, rough idling, or a frustrating no-start condition can bring any project or workday to a grinding halt. As the central command center of your vehicle, a failing Powertrain Control Module (PCM) can cause a cascade of confusing and costly problems. This isn’t just a part; it’s the brain of your engine and transmission, and when it falters, your vehicle’s reliability is compromised. Stop guessing with expensive diagnostics and get the definitive solution with this dependable, VIN-programmed PCM.
We take the guesswork and hassle out of the repair. This is a thoroughly tested, used PCM that we program specifically for your vehicle using your VIN. This critical step ensures that all factory settings, security information (like GM’s Passlock system), and operational parameters are perfectly matched to your truck or van. More importantly, we flash it with the latest software updates from GM. These updates often resolve underlying drivability issues you might have been living with, like harsh shifting or poor fuel economy. This isn’t just a replacement; it’s a restoration of your vehicle’s intended performance and reliability.
A Technician’s Notebook: The Phantom Misfire
I once had a 1999 Chevy Suburban in my bay that was driving the owner crazy. It had a random, intermittent misfire that wouldn’t set a specific cylinder code. He’d already replaced plugs, wires, cap, and rotor. We checked fuel pressure and injectors—all perfect. On a hunch, after seeing no other logical cause, I scoped the injector driver circuits at the PCM. I found that the driver for cylinder 3 was occasionally dropping out, but not long enough to trigger a specific DTC. The PCM itself was failing internally. We installed a VIN-programmed PCM just like this one, and the phantom misfire was gone for good. It’s a classic example of how a failing computer can mimic a mechanical problem, costing you time and money on unnecessary parts.
Is Your Truck or Van Showing These Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, your engine computer is a likely culprit:
- âś” Check Engine Light is on with communication error codes like P0601, P0602, P0605, or U-codes.
- âś” The engine cranks but refuses to start.
- âś” Unexplained drops in fuel efficiency.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Stalling, stumbling, or rough idling for no apparent reason.
- âś” Failure to pass an emissions test.
A Straightforward Guide to Installation
Because we handle the programming, installation is a simple mechanical swap that most DIYers can complete with basic hand tools. Get your vehicle back on the road in under an hour.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old PCM. There are usually retaining clips that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the electrical harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Final Step – Security Relearn: Some vehicles may require a simple security relearn procedure to sync the new PCM with the ignition key. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for specific steps if needed.
Verified Vehicle Compatibility
This PCM, identified by part number 16266645 or service number 09355699, is a direct-fit replacement for a wide range of popular GM trucks and vans from the late 1990s. While it fits many models, here is a sample of common applications:
- âś” 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups
- âś” 1998-1999 Chevrolet Tahoe & GMC Yukon
- âś” 1998-1999 Chevrolet Suburban
- âś” 1998-1999 Chevrolet Express & GMC Savana Vans
- âś” 1998 Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada
- âś” 1998 Chevrolet S10 & GMC Sonoma
- âś” 1998 Isuzu Hombre (4.3L V6)
- âś” 1999 Cadillac Escalade
Important: To guarantee a perfect match, please provide your vehicle’s VIN at checkout. This allows us to program the module specifically for your vehicle’s configuration.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your vehicle’s engine, transmission, and factory-installed options. We use it to load the exact GM-certified software onto the PCM, ensuring it works perfectly with your specific setup right out of the box.
Is this a plug-and-play part?
Yes! Because we pre-program the module to your VIN, it is a true plug-and-play solution. In some cases, a simple security relearn procedure (turning the key on for 10-15 minutes) may be required, but no expensive dealer visit is necessary.
What if my original part number is different?
This PCM is a direct replacement for several part numbers, including 09355699, 16250279, 16258815, and others listed. As long as your vehicle is on the compatibility list, this module will function correctly once programmed to your VIN.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal PCM failure (like codes P0601-P0606), this part will resolve the issue. However, if the light is on due to a faulty sensor or other component, that separate issue will still need to be addressed.
Is a used PCM reliable?
Absolutely. We source these modules from salvaged vehicles and put them through a rigorous testing process to ensure full functionality. This provides a reliable, cost-effective alternative to a brand new, unprogrammed computer from a dealer.