Restore Your Truck’s Performance and Reliability
If you’re dealing with frustrating engine problems in your 1998 Chevrolet Blazer S10 or GMC Jimmy S15, you know how quickly a reliable vehicle can become a source of stress. Intermittent stalling, a persistent check engine light, or a no-start condition can point directly to a failing Powertrain Control Module (PCM). As the central computer of your truck, a faulty PCM can create a cascade of issues that are often misdiagnosed. This is your direct, effective solution. We offer a genuine, used OEM PCM that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN), ensuring a seamless and correct installation.
From the Diagnostic Bay
I remember a 1998 GMC Jimmy S15 that came into the shop with a ghost of a problem. The owner had already replaced the fuel pump and ignition module, chasing an intermittent no-start condition. It would run fine for days, then refuse to start. No codes were stored consistently. After checking all the basics—fuel pressure, spark, and sensor data—we noticed the data stream from the PCM would occasionally drop out completely. It turned out the main processor on the board was failing under certain temperature conditions. We installed a VIN-programmed PCM just like this one, and the truck has been running reliably ever since. This simple swap saved the owner from more guesswork and hundreds in unnecessary parts.
Is Your S10 or Jimmy Showing These Signs?
- ✔ Persistent Check Engine Light (CEL) with communication codes (U-codes) or internal processor codes like P0601, P0605, or P0606.
- ✔ Unexplained stalling or engine shutting off while driving.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeably poor fuel economy and sluggish performance.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
- ✔ Failure to pass an emissions test due to PCM communication errors.
This isn’t just a replacement part; it’s a comprehensive fix. By providing us with your VIN, we flash the module with the latest GM-certified software for your exact vehicle configuration. This critical step ensures all engine and transmission parameters are correct, restoring the performance and efficiency you expect from your truck. This is the most reliable way to replace your 1998 Blazer S10 PCM without expensive trips to the dealership.
Your Straightforward Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On most S10/Jimmy/Blazer models, the PCM is located in the engine compartment, typically on the passenger side firewall or inner fender.
- ✔ Disconnect Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. These connectors have locking tabs that need to be released before pulling.
- ✔ Remove the Old Module: Unbolt the mounting brackets holding the old PCM in place and remove it from the vehicle.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM using the original hardware. Ensure it is secure.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will likely need to perform a GM Passlock/VATS security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle’s service manual will have the exact steps. This is a necessary final step for the vehicle to recognize the new computer.
Verified Compatibility for Your GM Vehicle
This module is a direct replacement for service number 09366810 and interchanges with part numbers 09355699, 16266645, 16250279, and 16258815. It is guaranteed to fit the following vehicles when matched by the part number ID 9355699:
- ✔ 1998-1999 Chevrolet & GMC C/K 1500/2500/3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Suburban & GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & Cadillac Escalade
- ✔ 1998-1999 Chevrolet Express & GMC Savana Vans (1500/2500/3500 Gasoline)
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada, GMC Envoy, Isuzu Hombre (4.3L)
- ✔ 1998 Chevrolet S10, GMC S15/Sonoma, Chevrolet Blazer S10 & GMC Jimmy S15 (4.3L)
Ordering a pre-programmed 1998 Blazer S10 PCM is the most efficient way to get your truck back on the road. Eliminate the diagnostic headaches and solve the root cause of your vehicle’s electronic issues today.
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential for us to program the PCM with the exact software and calibrations for your truck’s engine, transmission, and options. This ensures perfect compatibility and plug-and-play installation.
Is this a new part?
No, this is a high-quality, tested, and guaranteed functional used OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module.
Do I need any special tools to install this?
No special programming tools are required. Basic hand tools (like a socket set) are all you need for the physical installation. You will need to perform the standard GM security relearn procedure, which only requires the use of your ignition key.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your existing PCM (e.g., codes P0601-P0606), then yes, this part is the correct fix. If the light is on for another reason, like a bad sensor, you will still need to address that separate issue.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls engine functions. A PCM (Powertrain Control Module) controls both the engine and the transmission, which is standard on these GM vehicles. This part serves as the PCM.