Restore Peak Performance to Your Truck or Van
Is your truck suddenly stalling, shifting erratically, or refusing to start? Are you chasing a persistent Check Engine Light that points to an internal computer error? Before you spend another dime on parts that don’t fix the problem, consider the heart of your vehicle’s operating system: the Powertrain Control Module (PCM). This tested, reliable PCM is the definitive solution for a wide range of late-90s GM and Isuzu vehicles, including the dependable 1998 Isuzu Hombre PCM, and is delivered to you programmed and ready for installation.
As a technician with over two decades of experience, I’ve seen countless hours and dollars wasted on replacing sensors and fuel pumps when the root cause was a failing PCM. These modules manage everything from fuel injection and ignition timing to transmission shift points. When they start to fail, the symptoms can be confusing and intermittent. This unit eliminates the guesswork. It’s a genuine, used component sourced from a salvaged vehicle, professionally inspected, and flashed with the latest GM software updates specific to your vehicle’s VIN. This ensures optimal performance, fuel economy, and emissions compliance right out of the box.
A Technician’s Notebook: The Phantom Fuel Pump Failure
A customer brought in a ’99 Chevy Tahoe that would randomly die while driving. They had already replaced the fuel pump twice, convinced it was the issue. After it stalled in my bay, I hooked up my scanner and noticed the 5-volt reference signal to the sensors was dropping out intermittently—a classic sign of an internal PCM short. Instead of throwing more parts at it, we installed a VIN-programmed PCM just like this one. The truck fired right up and the stalling issue was gone for good. It’s a powerful reminder that the computer is often the hidden culprit behind the most frustrating drivability problems.
Is Your Truck Exhibiting These Classic PCM Failure Signs?
A faulty PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs:
- ✔ Unexplained Check Engine Light illumination, especially with codes like P0601 (Internal Control Module Memory Check Sum Error) or other P06xx codes.
- ✔ Engine stalling, stumbling, or hesitating for no apparent reason.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent loss of communication with diagnostic scan tools.
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle with basic tools. Our pre-programming service saves you a trip to the dealership, making this a simple swap.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these 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 unclip and remove the electrical connectors from the old PCM. The levers can be stiff, so apply steady pressure. Inspect connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, programmed PCM onto the bracket and securely reconnect all electrical harnesses. You should hear a distinct click as they lock into place.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle may require a security relearn procedure (often called a CASE relearn), which can typically be done with a capable scan tool or by following a simple key-cycle procedure.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for several part numbers and fits a wide array of popular models. Please match your original part number or verify your vehicle is on this list. This unit is compatible with service numbers 09355699, 16266645, 16250279, 16258815, and 09366810.
Key compatible models include:
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon
- ✔ 1998-1999 Chevrolet Suburban
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500)
- ✔ 1998 Chevrolet S10 / GMC Sonoma (4.3L)
- ✔ 1998 Chevrolet Blazer / GMC Jimmy (4.3L)
- ✔ 1998 Isuzu Hombre (4.3L)
- ✔ 1998 Oldsmobile Bravada & GMC Envoy
- ✔ 1998 Chevrolet Astro & GMC Safari Vans
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM with the correct software for your truck’s specific engine, transmission, and options. This ensures seamless integration and proper function without needing a trip to the dealer for expensive programming.
Is this a new part?
No, this is a high-quality, tested used PCM that has been sourced from a salvaged vehicle. Each unit is inspected for reliability and then programmed with the latest software updates, providing a dependable and cost-effective solution.
Will I need to do anything after installation?
In many cases, the vehicle will start and run perfectly. However, some GM vehicles of this era may require a Crankshaft Variation Relearn (CASE Relearn) to clear a P1336 code and ensure optimal engine timing. This can be performed by most professional scan tools.
How do I find my original part number?
Your PCM’s part number is printed on a sticker directly on the module’s case. You will need to locate the PCM in your engine bay to read it. Match it to one of the compatible numbers listed to ensure a perfect fit.