Restore Your GM Truck’s Brain with a Reliable, Programmed PCM
If you’re dealing with a no-start condition, erratic engine behavior, or a persistent Check Engine Light on your 1998 Chevy Blazer or GMC Jimmy, the Powertrain Control Module (PCM) is often the culprit. I’ve spent countless hours in the shop tracing phantom electrical issues back to a failing PCM on these GMT330 platform vehicles. The internal components simply wear out over time from heat and vibration, leading to frustrating problems that can sideline your truck. This isn’t just a replacement part; it’s a direct solution to get you back on the road without the dealership hassle or expense.
This is a thoroughly tested, used OEM PCM that we flash with the latest GM-certified software specifically for your vehicle. By providing your Vehicle Identification Number (VIN) at checkout, you receive a module that is truly plug-and-play. We handle all the programming, so you can avoid costly trips to a mechanic for software calibration. This is the most straightforward and economical way to restore your vehicle’s performance and reliability.
Case Study: A Tricky Diagnosis
I remember a ’98 Jimmy S15 that came into my bay with an intermittent no-start and random stalling. The owner had already replaced the fuel pump and ignition coil. My scan tool showed a P0601 (Internal Control Module Memory Check Sum Error), but only sporadically. After verifying all power and ground circuits to the PCM were solid, I knew the issue was internal to the computer itself. These early PCMs are notorious for failing solder joints. We swapped in one of our pre-programmed modules, and the truck fired up instantly and ran perfectly. It’s a classic failure mode for these vehicles, and this part is the definitive fix.
Is Your Truck Showing These Telltale Signs?
A failing PCM can cause a wide range of symptoms. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0605, or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling, especially when warm.
- ✔ Rough or unstable idle.
- ✔ Poor fuel economy and decreased engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inconsistent or non-functional gauges.
A Straightforward Guide to Installation
Installing your new 1998 Blazer S10 PCM is a job most DIY enthusiasts can handle in under an hour. Follow these steps for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On the 1998 Blazer/Jimmy, the PCM is typically located in the engine bay, on the passenger side firewall or inner fender.
- Disconnect Connectors: Carefully unclip the wire harness connectors from the old PCM. There are usually several multi-pin connectors with locking tabs. Do not force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you may need to reuse it.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Firmly plug the wire harness connectors into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): While we program the VIN, some GM vehicles require a simple 10-30 minute key cycle security relearn procedure. This involves turning the key to ‘ON’ for 10 minutes, then ‘OFF’, and repeating two more times. Your vehicle’s service manual will have the exact steps.
Verified Fitment For Your GM Truck or Van
This PCM, identified by service ID 9355699, is a direct replacement for part numbers 16250279, 09355699, 16266645, 16258815, and 09366810. It is compatible with a wide range of GM vehicles, including:
- 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- 1998-1999 Chevrolet Suburban 1500 & 2500 (Gasoline)
- 1998-1999 Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (Gasoline)
- 1998 Chevrolet Blazer S10 / GMC Jimmy S15 (4.3L V6)
- 1998 Oldsmobile Bravada (4.3L V6)
- 1998 GMC Envoy (4.3L V6)
- 1998 Chevrolet S10 / GMC Sonoma (4.3L V6)
- 1998 Isuzu Hombre (4.3L V6)
- 1998 Chevrolet Astro / GMC Safari
- 1999 Cadillac Escalade
Note: Please match your part number or service ID to ensure compatibility. If you’re unsure, contact us with your VIN.
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module with the latest GM software using the VIN you provide. It arrives ready for installation. A simple security relearn procedure may be required on some models, which does not require any special tools.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship your order until we receive this information.
Is this a used part?
Yes, this is a reliable, OEM computer sourced from a salvaged vehicle. Each unit is inspected and tested before being professionally programmed to ensure it functions correctly.
What if my original part number is not 16250279?
This module is a direct replacement for several part numbers, including 09355699, 16266645, 9355699, 16258815, and more. As long as your vehicle is on the compatibility list and uses the service ID 9355699, this part will work.
What is the benefit of getting the newest GM updates?
GM often releases software updates to fix factory bugs, improve transmission shift points, optimize fuel delivery, and enhance overall engine performance. Your module will have these improvements already loaded.