Is Your 1998 Blazer or Jimmy Running Rough?
There’s nothing more frustrating than a trusty truck that suddenly won’t cooperate. If your 1998 Chevy Blazer S10, GMC Jimmy S15, or another compatible GM vehicle is experiencing baffling issues like a persistent check engine light, erratic shifting, a no-start condition, or terrible fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). This isn’t just a simple component; it’s the electronic brain of your engine and transmission. When it falters, your whole vehicle suffers.
This is a genuine, road-tested OEM Powertrain Control Module, part number 16258815. We’ve sourced this unit from a salvaged vehicle and meticulously inspected it for quality. But the real value is in our service: before this PCM ships, our in-house experts will flash it with the latest official GM software updates, precisely programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means you get a part that’s not just a replacement, but a fully updated component ready for immediate installation.
“A customer’s 1998 GMC Jimmy S15 came into my shop last month with a problem that had stumped two other mechanics. It would randomly stall at stoplights, but never throw a consistent code. We checked fuel pressure, spark, and sensorsโall were fine. On a hunch, I monitored the PCM data stream and saw the injector pulse width dropping out intermittently. After installing one of our pre-programmed PCMs, the stalling vanished completely. It was a classic case of internal PCM failure that only real-world diagnostics could pinpoint.”
Symptoms of a Failing GM PCM
If you’re noticing any of the following, a faulty engine computer is a likely culprit:
- โ Check Engine Light is on with various, often unrelated, trouble codes.
- โ The engine cranks but refuses to start.
- โ Unexplained drops in fuel mileage.
- โ Harsh or erratic automatic transmission shifting.
- โ The vehicle stalls unexpectedly while driving or at idle.
- โ Failure to pass an emissions or smog test.
Why Choose a Pre-Programmed 1998 Blazer S10 PCM?
Buying a used computer off the shelf is a gamble. It will have the incorrect VIN and likely won’t communicate with your vehicle’s security system (Passlock/VATS), leaving you with a truck that still won’t start. Our service eliminates that entire headache. By programming the module to your VIN, we ensure it’s a true plug-and-play solution. You avoid expensive dealership programming fees and the hassle of towing your vehicle for a simple part swap.
Simple, DIY-Friendly Installation
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10 minutes for the system to discharge.
- Locate the PCM: On a 1998 Blazer S10 or Jimmy S15, the PCM is typically located in the engine bay on the passenger side (RH side), near the firewall or inner fender.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. Inspect the pins for any corrosion or damage.
- Swap the Module: Unbolt the old PCM and remove it. Mount your new, pre-programmed PCM in its place.
- Reconnect Everything: Securely plug the electrical harnesses into the new PCM until they click. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): While we program the VIN, some GM Passlock systems require a simple 10-30 minute relearn procedure. It involves turning the key to ‘ON’ and waiting. We provide easy-to-follow instructions for this.
This module is a direct replacement for a wide range of GM trucks and vans. Please verify your part number or match your vehicle in our compatibility list. This unit is interchangeable with service numbers 09355699, 16266645, 16250279, 9366810, and more. After your purchase, simply reply to your order confirmation email with your 17-digit VIN, and we’ll handle the rest.