Restore Peak Performance to Your Isuzu Hombre
Is your 1998-2000 Isuzu Hombre or GM truck giving you headaches? If you’re dealing with a persistent Check Engine light, rough idling, stalling, or unpredictable shifting, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM governs everything from fuel mixture and ignition timing to transmission shift points. When it falters, the entire vehicle’s performance suffers. This isn’t just an annoyance; it can affect fuel economy and leave you stranded.
This replacement 1998-2000 Isuzu Hombre PCM is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically for your truck using your Vehicle Identification Number (VIN). This means it arrives at your door loaded with the latest GM software updates, ready for a straightforward installation. You get a reliable, fully functional engine computer without the expensive trip to a dealership for programming.
Common Signs of a Failing PCM
- âś” Your vehicle cranks but refuses to start.
- âś” The engine runs rough, misfires, or stalls unexpectedly.
- âś” You’re experiencing a noticeable drop in fuel mileage.
- âś” The transmission shifts erratically, harshly, or gets stuck in one gear.
- âś” The Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- âś” Failure to pass an emissions or smog test.
A Technician’s Notebook: The Intermittent No-Start
I had a 1999 Chevy S10 with the 4.3L V6 in my bay—the same platform as the Isuzu Hombre—that was driving its owner crazy. It would start perfectly for a week, then suddenly refuse to fire up. There were no consistent codes, just a frustrated customer. After checking all the basics—fuel pressure, spark, and battery—everything seemed fine. On a hunch, I tapped the PCM housing with a screwdriver handle while my assistant cranked the engine, and it fired right up. The issue was a hairline crack in a solder joint on the internal circuit board, a common failure point on these units due to heat cycles and vibration. A replacement programmed PCM fixed the problem permanently. Sometimes, the most elusive electrical gremlins live inside the box itself.
Your Straightforward Installation Guide
- âś” Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- âś” Locate the PCM: On most Isuzu Hombres and S10/Sonoma models, the PCM is located in the engine compartment on the right-hand (passenger) side, near the firewall or inner fender.
- âś” Disconnect the Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before pulling.
- âś” Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
- âś” Install the New PCM: Mount the new, programmed module in place and securely fasten it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- âś” Reconnect the Battery: Reattach the negative battery terminal.
- âś” Perform Security Relearn (If Necessary): Some GM vehicles of this era require a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. On the fourth try, the vehicle should start.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit the following vehicles with the specified options:
CHEVROLET S10 / GMC SONOMA 98-00 (4.3L V6)
CHEVROLET BLAZER / GMC JIMMY 98-00
OLDSMOBILE BRAVADA 98-00
GMC ENVOY 98-00
CHEVROLET ASTRO / GMC SAFARI 99-01
CHEVROLET / GMC 1500, 2500, 3500 PICKUPS 99-00 (Gasoline Engines)
CHEVROLET SILVERADO / GMC SIERRA 1500 99-00 (6 Cylinder)
CHEVROLET TAHOE / GMC YUKON 99-00
CHEVROLET SUBURBAN 1500/2500 99
CADILLAC ESCALADE 99-00
CHEVROLET EXPRESS / GMC SAVANA VANS 1500, 2500, 3500 99-02 (Gasoline Engines)
Please verify your part number or contact us with your VIN to confirm fitment.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your truck’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box.
Is this a simple plug-and-play installation?
Yes! Because we pre-program the module, you won’t need to take it to a dealer. In most cases, you simply install the part and perform a quick security relearn procedure, which requires no special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls transmission line pressure and shift solenoids. If the module is faulty, it can cause hard shifts, delayed shifting, or failure to shift. This part can resolve those issues if the PCM is the root cause.
Do I need to return my old PCM?
This purchase does not require you to return your old part. There is no core charge associated with this module.