Get Your GM Truck Running Right Again
Is your 1998 Chevy S10, GMC Sonoma, or another compatible GM truck giving you headaches? If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition, a failing Powertrain Control Module (PCM) is a very likely culprit. In my 20+ years of diagnostics, I’ve seen countless vehicles sidelined by a faulty computer. The good news is, you’ve found the straightforward, reliable solution right here. This isn’t just a replacement part; it’s a complete fix that arrives ready for installation.
This is a genuine, road-tested used PCM that we program with the latest GM software updates specifically for your vehicle. By providing your Vehicle Identification Number (VIN) at checkout, you eliminate the need for an expensive trip to the dealership for programming. We handle the critical software flashing here, so you can get your truck or van back on the road with confidence. This is the smart, cost-effective way to restore your vehicle’s performance and reliability without the high cost of a new module.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a customer bringing in his ’98 GMC Jimmy with the 4.3L V6. It had an intermittent stalling problem that was driving him crazy. He’d already replaced the fuel pump and filter based on a friend’s advice, but the issue persisted. When we hooked up the scanner, there were no hard codes, just some strange data readings from the sensors right before it would die. After running a full diagnostic, we traced the issue to the PCM itself. The internal processor was failing under heat, causing it to randomly cut fuel and spark. We swapped in a VIN-programmed PCM just like this one, and the truck ran perfectly. It’s a classic example of how a faulty 1998 S10 PCM can mimic other component failures, making accurate diagnosis key.
Is Your Truck Exhibiting These PCM Failure Signs?
A failing computer can cause a wide range of symptoms. If you’re experiencing any of the following, this module is the likely solution you need:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0604, or P0606
- ✔ Engine stalling or randomly shutting off
- ✔ Harsh or erratic transmission shifting
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Poor fuel economy and overall reduced performance
- ✔ Failure to pass an emissions inspection
A Straightforward Guide to Installation
Installing your new 1998 S10 PCM is a manageable job for a DIY enthusiast. Following these steps will ensure a smooth swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On most of these trucks and vans (like the S10/Sonoma, Blazer/Jimmy, or Astro/Safari), the PCM is located in the engine compartment, often on the passenger side fender well or near the battery.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. These connectors have locking tabs that need to be released before they can be unplugged. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. There are typically a few bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In many cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the vehicle’s anti-theft system to recognize the new computer.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for service number 16258815 and interchanges with several other part numbers. We guarantee compatibility if your vehicle is on this list and your original module carries the ID 9355699. Please match this ID for a perfect fit.
CHEVROLET 2500 PICKUP 98-99 (Gasoline, ID 9355699)
CHEVROLET 3500 PICKUP 98-99 (Gasoline, ID 9355699)
GMC 1500 PICKUP 98-99 (Gasoline, ID 9355699)
GMC 2500 PICKUP 98-99 (Gasoline, ID 9355699)
GMC 3500 PICKUP 98-99 (Gasoline, ID 9355699)
S10/S15/SONOMA 98 (4.3L, w/o build date opt ZN4, ID 9355699)
BLAZER S10/JIMMY S15 98 (w/o build date opt ZN4, ID 9355699)
ASTRO 98 (ID 9355699)
SAFARI (GMC) 98 (ID 9355699)
BRAVADA 98 (4.3L, w/o build date opt ZN4, ID 9355699)
ENVOY 98 (w/o build date opt ZN4, ID 9355699)
ISUZU HOMBRE 98 (4.3L, w/o build date opt ZN4, ID 9355699)
TAHOE 98-99 (Gasoline, ID 9355699)
YUKON 98-99 (ID 9355699)
SUBURBAN 1500/2500 98-99 (Gasoline, ID 9355699)
ESCALADE 99 (ID 9355699)
EXPRESS VAN 1500/2500/3500 98-99 (Gasoline, ID 9355699)
SAVANA VAN 1500/2500/3500 98-99 (Gasoline, ID 9355699)
This is your opportunity to solve frustrating electronic issues with a quality-tested part, programmed specifically for your truck. By choosing this 1998 S10 PCM, you’re not just buying a part; you’re buying a solution that saves you time, money, and the hassle of a dealership visit.
Frequently Asked Questions
What do you mean by ‘programmed to my VIN’?
When we program the PCM, we load it with the specific software and calibrations from GM that match your vehicle’s exact options, engine, and transmission, all based on your VIN. This ensures it works perfectly right out of the box.
Is this a used part?
Yes, this is a thoroughly tested, genuine OEM computer sourced from a salvaged vehicle. We inspect each unit to ensure it’s fully functional before programming and shipping, offering you OEM reliability at a great value.
Will I need to do anything else after installation?
In most cases, you will need to perform a simple ‘Security Relearn’ procedure, which pairs the computer to your vehicle’s anti-theft system. This procedure is easy and does not require special tools. Instructions are readily available online or we can point you to them. A Crankshaft Variation (CASE) relearn may also be needed with a scan tool for optimal performance, but the vehicle will typically run without it.
How do I find my PCM’s part number or ID?
The part number and service ID are printed on a sticker on the PCM itself. For these GM models, matching the 7-digit ID (e.g., 9355699) is the most important step for ensuring compatibility.
What if I order the wrong part?
We strongly encourage you to verify your vehicle’s compatibility using the list provided and by checking the ID on your current PCM. Providing your VIN for programming helps us double-check, but confirming the physical part ID is the best way to guarantee a match.