Restore Your Truck’s Performance and Reliability
Is your 1998 Isuzu Hombre or GM truck running rough, stalling unexpectedly, or showing a persistent check engine light? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and complex issues. As the central computer of your vehicle, the PCM manages everything from fuel mixture and ignition timing to transmission shifting. When it fails, the symptoms can be unpredictable and difficult to diagnose. This replacement PCM is the definitive solution to restore your vehicle’s factory performance and get you back on the road with confidence.
We take the guesswork and high cost out of the repair process. Unlike a generic part from a local store, this module comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means no expensive trips to the dealership for flashing or programming. It arrives ready for installation, loaded with the latest GM software updates to ensure optimal engine and transmission function. This is the most direct and reliable way to fix issues caused by a faulty computer.
From the Diagnostic Bay
I remember a 1998 GMC Jimmy that came into my shop with a bizarre set of symptoms—erratic idling, hard 1-2 shifts, and a check engine light with a P0601 (Internal Control Module Memory Check Sum Error) code. The owner had already replaced the throttle position sensor and the mass air flow sensor with no luck. After confirming good power and ground at the PCM connectors, we knew the internal processor was failing. Swapping in a pre-programmed PCM like this one solved every single issue in under 30 minutes. It’s a prime example of how targeting the root cause with a quality part saves time, money, and a lot of headaches.
Is Your Vehicle Exhibiting These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, your module may be the cause:
- ✔ Check Engine Light is on with codes like P0601, P0606, or U-series communication codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Poor fuel economy and a noticeable loss of power.
- ✔ Communication issues with diagnostic scan tools.
A Straightforward Guide to Your PCM Swap
Installing your new 1998 Isuzu Hombre PCM is a job most DIYers can handle with basic tools. Follow these steps for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible models (like the S-10/Hombre platform), the PCM is located in the engine bay, typically on the passenger-side fender or firewall. Refer to your vehicle’s service manual for the exact location.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. Inspect the terminals for any corrosion or damage. Clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new module. Reconnect the negative battery terminal.
- Perform Security Relearn (If Required): Some GM vehicles of this era require a simple security relearn procedure to sync the new PCM with the anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your service manual for the specific procedure for your vehicle.
Verified Vehicle Compatibility List
This module is a direct replacement for part numbers 16250279, 09366810, and 09355699. It is guaranteed to fit the following makes and models:
BLAZER S10/JIMMY S15 98 (RH front engine compartment), w/o build date opt ZN4
BRAVADA 98 (6-262, 4.3L), w/o build date opt ZN4
CHEVROLET 1500 PICKUP 98-99 (Gasoline, LH engine compartment)
CHEVROLET 2500 PICKUP 98-99 (Gasoline, LH front engine compartment)
CHEVROLET 3500 PICKUP 98-99 (Gasoline, LH front engine compartment)
ENVOY 98 (RH front engine compartment), w/o build date opt ZN4
ESCALADE 99 (LH front engine compartment)
EXPRESS 1500 VAN 98 (Gasoline)
EXPRESS 2500 VAN 98 (Gasoline)
EXPRESS 3500 VAN 98 (Gasoline)
GMC 1500 PICKUP 98-99 (Gasoline, LH engine compartment)
GMC 2500 PICKUP 98-99 (Gasoline, LH front engine compartment)
GMC 3500 PICKUP 98-99 (Gasoline, LH front engine compartment)
ISUZU HOMBRE 98 (4.3L, 6-cylinder), w/o extended build date opt ZN4
S10/S15/SONOMA 98 (6-262, 4.3L), w/o build date opt ZN4
SAFARI (GMC) 98-99 (LH front by battery)
SAVANA 1500 VAN 98 (Gasoline)
SAVANA 2500 VAN 98 (Gasoline)
SAVANA 3500 VAN 98 (Gasoline)
SUBURBAN 1500 98-99 (Gasoline, LH front engine compartment)
SUBURBAN 2500 98-99 (Gasoline, LH front engine compartment)
TAHOE 98-99 (Gasoline, LH engine compartment)
YUKON 98-99 (LH engine compartment)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Because we program the module to your VIN before shipping, it is a direct installation. However, on some GM vehicles, you may need to perform a simple security relearn procedure (often called Passlock or VATS relearn) and a Crankshaft Position Sensor (CASE) relearn. The security relearn allows the engine to start, and the CASE relearn ensures the PCM detects misfires accurately. A capable scan tool is needed for the CASE relearn.
How do I provide my VIN number?
After completing your purchase, please send us a message with your 17-digit VIN. We cannot program and ship your module without this information. Please double-check the VIN for accuracy.
Is this a new or used part?
This is a professionally inspected and reconditioned OEM part that has been tested to meet or exceed original factory specifications. It is then programmed with the latest software for your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids to manage shift points. If your hard or erratic shifting is caused by a faulty computer, this module will resolve it. However, it will not fix internal mechanical issues within the transmission itself.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM controls both the engine and the transmission, which is the case for most vehicles this part fits. Our module serves as the correct replacement for both.