Restore Peak Performance to Your GM Truck or Van
Is your truck or van giving you headaches? Unexplained stalling, a persistent check engine light, or rough idling can turn a reliable workhorse into a source of constant frustration. As a technician with over two decades of experience under the hood, I’ve seen countless vehicles sidelined by a faulty Powertrain Control Module (PCM). This isn’t just an inconvenience; it affects your vehicle’s fuel economy, emissions, and overall drivability. The PCM is the brain of your engine, and when it fails, the symptoms can be confusing and costly to misdiagnose.
This is your direct-fit, reliable solution. We are offering a tested, used OEM engine computer, part number 16266645, that serves as the heart of your vehicle’s management system. The best part? It arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle’s Vehicle Identification Number (VIN). This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money. Simply provide your VIN at checkout, and we handle the rest, ensuring a seamless installation process.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1999 Chevy Suburban that came into my bay with a classic ‘ghost’ problem. The owner had replaced the fuel pump, spark plugs, and wires, but it still had an intermittent no-start condition and would sometimes die at stoplights. No consistent codes were being thrown, just a random P0601 (Internal Control Module Memory Check Sum Error) every now and then. After confirming fuel pressure and spark were good during a fault event, I focused on the PCM. A failing internal processor was causing it to intermittently lose its mind. Swapping in a properly programmed PCM like this one solved the issue instantly. The owner was thrilled to have his reliable family hauler back without throwing any more parts at it.
Is Your Truck or Van Showing These Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is a likely solution:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0602, or P0605
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failed emissions test
Your Straightforward Installation Guide
Installing your programmed 1998 Isuzu Hombre PCM is a manageable job for a DIYer with basic tools. Follow these steps carefully to ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental power surges.
- Locate the PCM: On most of these GM trucks and vans, the PCM is located in the engine compartment, often on the driver’s side fender or near the battery. Consult your vehicle’s service manual for the exact location.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them. Note their orientation.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the wiring harnesses back into the new PCM, ensuring they click securely into place. Reconnect your negative battery terminal.
- Perform Security Relearn (If Necessary): On many GM vehicles of this era, you may need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle should then start.
Verified Compatibility for Your GM Vehicle
This engine computer is a direct replacement for part numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It is confirmed to fit a wide range of popular GM models. Please match your vehicle and options below to ensure proper fitment. This module is a common solution for many platforms, including the 1998 Isuzu Hombre PCM replacement.
EXPRESS 2500 VAN 98 Electronic Control Module; gasoline, ID 9355699
SAVANA 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 9355699
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 9355699
SAFARI (GMC) 98 Electronic Control Module; (LH front by battery), ID 9355699
SAVANA 1500 VAN 98 Electronic Control Module; ID 9355699
SUBURBAN 1500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ASTRO 98 Electronic Control Module; (LH front by battery), ID 9355699
SAVANA 3500 VAN 98 Electronic Control Module; gasoline, ID 9355699
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/o build date opt ZN4; ID 9355699
EXPRESS 1500 VAN 98 Electronic Control Module; ID 9355699
SAVANA 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
TAHOE 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
YUKON 98-99 Electronic Control Module; (LH engine compartment), ID 9355699
SAVANA 2500 VAN 98 Electronic Control Module; gasoline, ID 9355699
CHEVROLET 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
SUBURBAN 2500 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 9355699
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L, (LH engine compartment), ID 9355699
CHEVROLET 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
EXPRESS 2500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/o extended build date opt ZN4; ID 9355699
EXPRESS 1500 VAN 99 Electronic Control Module; (LH rear engine compartment), ID 9355699
EXPRESS 3500 VAN 98 Electronic Control Module; gasoline, ID 9355699
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/o build date opt ZN4; ID 9355699
BLAZER S10/JIMMY S15 98 Electronic Control PModule; (RH front engine compartment), w/o build date opt ZN4; ID 9355699
EXPRESS 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
GMC 1500 PICKUP 99 Electronic Control Module; 5.7L, (LH engine compartment), ID 9355699
SAVANA 3500 VAN 99 Electronic Control Module; (LH rear engine compartment), gasoline, ID 9355699
GMC 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 2500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
CHEVROLET 1500 PICKUP 98 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
GMC 3500 PICKUP 98-99 Electronic Control Module; gasoline (LH front engine compartment), ID 9355699
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 specific engine, transmission, and options. This ensures perfect compatibility and performance.
Is this a new part?
No, this is a thoroughly tested, used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module.
Do I need to have this programmed by a dealer?
Absolutely not! The main benefit of our service is that we program the module for you before shipping. It will arrive ready to install, saving you a trip to the dealership and their programming fees.
Will I need to do anything after installation?
In many cases, you may need to perform a simple ‘Security Relearn Procedure’ to sync the new PCM with your vehicle’s anti-theft system. We include general instructions for this common and simple procedure.
What if my part number is slightly different?
This PCM, identified by service number 16266645, replaces several other part numbers, including 09355699. As long as your vehicle is on our compatibility list, this module will function correctly once programmed to your VIN.