Restore Your Truck’s Performance and Reliability
Is your 1998-2000 Isuzu Hombre running rough, throwing confusing check engine lights, or refusing to start? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and hard-to-diagnose issues. As the brain of your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems, from poor fuel mileage to a complete no-start situation. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. This replacement PCM is the definitive solution to restore your truck’s original performance and dependability.
We take the guesswork and hassle out of the repair process. Unlike other sellers, we flash this module with the latest GM-certified software updates specifically for your vehicle. Simply provide us with your truck’s Vehicle Identification Number (VIN) after purchase, and we’ll handle the programming before it ships. This means you receive a part that is truly ready for installation, saving you a costly trip to the dealership for programming services. This is a direct-fit, reliable fix for your 1998-2000 Isuzu Hombre PCM, getting you back on the road with confidence.
A Technician’s Notebook: The Phantom No-Start
I had a 1999 GMC Sonoma with the 4.3L V6—the same platform as the Isuzu Hombre—towed into my bay. The customer said it would crank but never fire. He had already replaced the fuel pump, ignition coil, and crank sensor. My scanner couldn’t communicate with the PCM, which is a massive red flag. After checking all power and ground circuits to the module, I confirmed the PCM itself was dead. These units, especially after 20+ years, can fail internally from heat cycles and vibration, causing intermittent or total failure. We installed one of these pre-programmed modules, and the truck fired up on the first try. It’s a classic failure I’ve seen dozens of times.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention. Replacing your 1998-2000 Isuzu Hombre PCM can be the solution.
- âś” Persistent Check Engine Light (CEL)
- âś” Engine cranks but will not start
- âś” Rough idling or stalling
- âś” Noticeable decrease in fuel economy
- âś” Harsh or erratic transmission shifting
- âś” Failure to pass an emissions test
- âś” Diagnostic trouble codes (DTCs) such as P0601, P0604, or P0606
- âś” No communication with the PCM using a scan tool
A Straightforward Guide to Installation
For the DIY mechanic, swapping the PCM on your Isuzu Hombre is a manageable job. The module is typically located in the engine bay, making access relatively easy. Always consult a service manual for your specific vehicle, but here are the general steps.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On the 1998-2000 Isuzu Hombre with the 4.3L engine, the PCM is located in the right-hand (passenger side) front of the engine compartment.
- Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released before pulling.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware in a safe place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: In many cases, you may need to perform a security relearn or a Crankshaft Position (CASE) relearn procedure for optimal performance. This can often be done without special tools, but a capable scan tool may be required for the CASE relearn.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, and 21811787. While this is the correct 1998-2000 Isuzu Hombre PCM, it also fits a wide range of other GM trucks and vans. Please verify your part number or match your vehicle from the list below to ensure proper fitment.
ASTRO 99-01 Electronic Control Module; (LH front by battery), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
BRAVADA 98-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, ID 16263494
CHEVROLET 2500 PICKUP 99-00 Electronic Control Module; gasoline, ID 16263494 for 99
CHEVROLET 3500 PICKUP 99-00 Electronic Control Module; gasoline, ID 16263494 for 99
ENVOY 98-00 Electronic Control Module; (RH front engine compartment)
ESCALADE 99-00 Electronic Control Module; ID 16263494 for 99
EXPRESS/SAVANA 1500 VAN 99-02 Electronic Control Module; ID 16263494
EXPRESS/SAVANA 2500 VAN 99-02 Electronic Control Module; gasoline, ID 16263494
EXPRESS/SAVANA 3500 VAN 99-02 Electronic Control Module; gasoline, ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, ID 16263494
GMC 2500 PICKUP 99-00 Electronic Control Module; gasoline, ID 16263494 for 99
GMC 3500 PICKUP 99-00 Electronic Control Module; gasoline, ID 16263494 for 99
S10/S15/SONOMA 98-00 Electronic Control Module; 4.3L
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SIERRA/SILVERADO 1500 PICKUP 99-00 Electronic Control Module; 6 cylinder
SUBURBAN 1500/2500 99 Electronic Control Module; gasoline, ID 16263494
TAHOE/YUKON 99-00 Electronic Control Module; ID 16263494 for 99
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your truck’s specific options, engine, and transmission. We use the VIN to load the exact, correct GM software and the latest updates onto the PCM, ensuring it works perfectly with your vehicle right out of the box.
Is this a simple plug-and-play installation?
Yes, for the most part. Because we program the module to your VIN, it eliminates the most difficult step. However, on some GM vehicles of this era, a security relearn procedure (often called Passlock or Passkey) may be required after installation. This procedure can typically be done without special tools and instructions are readily available online.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., DTC P0601), then yes, this module will resolve the issue. However, if the light is on due to a faulty sensor or other component, you will still need to diagnose and repair that separate problem.
Do I need to send my old PCM back?
No core charge is required for this part. You can keep or responsibly recycle your old module without any need to return it to us.
What if my part number is slightly different?
This module replaces several part numbers, including 16263494 and 16265035. As long as your vehicle is on the compatibility list and you provide your VIN, we will ensure the programming is a perfect match, even if the number on your original part differs.