Restore Your Truck’s Performance and Reliability
Is your Chevrolet S10, GMC Sonoma, or another trusty GM vehicle from the late ’90s giving you headaches? If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, a faulty PCM can cause a cascade of frustrating issues. This isn’t just an inconvenience; it affects your vehicle’s safety, fuel economy, and ability to pass emissions tests. We offer a dependable and affordable solution: a thoroughly tested, used OEM PCM with service number 9355699, professionally programmed to your vehicle’s specific VIN.
From the Diagnostic Bay: The Ghost in the Machine
I remember a 1999 Chevy Tahoe that came into my shop on a tow truck. The owner was at his wit’s end. It would crank but never start, and he’d already replaced the fuel pump and crank sensor. His scanner couldn’t communicate with the engine computer at all. After confirming power and ground at the PCM connector, it was clear the module itself was dead. A new one from the dealer was quoted at over $600 plus programming fees. Instead, we sourced a quality used unit like this one. We got the customer’s VIN, programmed the module with the latest GM software, and shipped it to him. He installed it in under 30 minutes, performed the simple security relearn, and the truck fired up on the first try. He saved hundreds of dollars and got his reliable workhorse back on the road. This is the exact solution we provide for you.
Is Your Vehicle Showing These Telltale Signs of PCM Failure?
A failing engine computer can manifest in many ways. If you’re experiencing any of the following, a replacement 1998 S10 PCM could be the definitive fix your vehicle needs. Look out for:
- ✔ Check Engine Light is on with communication-related codes (like U-codes) or internal processor failure codes (P0601, P0605, P0606).
- ✔ Engine cranks but will not start.
- ✔ Rough or inconsistent idling and stalling.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent issues that seem to have no other logical cause.
A Straightforward Guide to Installation
One of the biggest benefits of our service is that this module arrives ready for installation. No trip to the dealership for expensive programming is required. Here’s a general guide to get you started:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- 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 well or near the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Most of these GM vehicles require a simple security relearn procedure to sync the new PCM with your key. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle’s specific procedure is readily available online.
Verified Vehicle Compatibility
This PCM, identified by service number 9355699, is a direct replacement for a wide range of GM vehicles. It also interchanges with part numbers 16266645, 16250279, 16258815, and 09366810. Please verify your original part number or contact us with your VIN to confirm fitment. This module fits the following vehicles:
- ✔ 1998 Chevrolet S10 / GMC S15/Sonoma: 4.3L (6-262), w/o build date opt ZN4
- ✔ 1998 Chevrolet Blazer S10 / GMC Jimmy S15: w/o build date opt ZN4
- ✔ 1998 Oldsmobile Bravada / GMC Envoy: w/o build date opt ZN4
- ✔ 1998 Isuzu Hombre: 4.3L, w/o extended build date opt ZN4
- ✔ 1998-1999 Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Suburban / Tahoe / GMC Yukon (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- ✔ 1998 Chevrolet Astro / GMC Safari
Note: This is not an exhaustive list. Always match the service ID number 9355699 on your original module.
Frequently Asked Questions
How does the VIN programming process work?
After you complete your purchase, simply send us your 17-digit Vehicle Identification Number (VIN). We use this to flash the module with the correct, latest GM-approved software for your specific vehicle, ensuring perfect compatibility.
Is this part new?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This allows us to offer a reliable, factory-spec part at a fraction of the cost of a new dealer part.
Will I need to do anything after installing this 1998 S10 PCM?
Yes, in most cases you will need to perform a security relearn procedure (also known as a Passlock or anti-theft relearn). This is a simple procedure that takes about 30 minutes and does not require any special tools. It syncs the new computer to your vehicle’s anti-theft system.
What if my original part number is different?
This module, 9355699, directly replaces several other part numbers like 16266645, 16250279, and more. As long as your vehicle is on the compatibility list and your original module has one of the listed interchange numbers, this part will work.
What is the benefit of getting a module with the newest updates?
Over the years, manufacturers like GM release software updates to fix bugs, improve transmission shifting logic, and enhance engine efficiency. By flashing your module with the latest software, you’re getting a part that performs better than the original one that came from the factory.