Is Your Work Van Unreliable? Get it Back on the Road Fast.
If your 1998 or 1999 GMC Savana 3500 is giving you headaches with stalling, a persistent check engine light, or a frustrating no-start condition, a failing Powertrain Control Module (PCM) is a likely culprit. For a workhorse vehicle like the Savana, downtime isn’t just an inconvenience—it’s lost income. This isn’t just a replacement part; it’s a reliable, plug-and-play solution designed to get your van running smoothly again without a costly trip to the dealership.
From My Shop to Your Driveway: A Real-World Diagnostic Story
“A customer’s ’99 Chevy Express 3500, which uses this exact same PCM, came into my shop last month. It had an intermittent stalling problem that was driving him crazy. He was convinced he needed a new fuel pump. After scanning it, I saw some erratic sensor readings but no specific fuel pressure codes. Before just throwing parts at it, I always check the basics. We cleaned the main engine-to-chassis ground connection, which was a bit corroded, but the issue persisted. After confirming all sensor inputs and wiring were solid, we pinpointed the PCM itself. The internal processors were failing under heat. We installed one of these VIN-programmed modules, and the van has been running perfectly ever since. It’s a reminder that while you should always check the simple things first, these PCMs are a known failure point after 20+ years of service.”
Symptoms of a Failing GM PCM
A faulty engine computer can cause a wide range of confusing issues. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Engine stalls or runs rough, especially when warm
- ✔ Vehicle won’t start, but the battery and starter are good
- ✔ Poor fuel economy and loss of power
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
Easy Installation Guide for Your 1998-1999 Savana 3500 PCM
You don’t need to be a master mechanic to install this part. Our VIN programming makes it a direct-fit, plug-and-play process. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, on the driver’s side, near the air filter housing.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. Inspect the connectors for any corrosion or bent pins and clean them if necessary.
- Swap the Module: Unbolt the old PCM from its bracket and set it aside. Mount your new, pre-programmed module in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM until they click into place. Reconnect your vehicle’s negative battery terminal.
- Final Step: Start the engine. The vehicle will now run with the correct software for its specific configuration. No further programming is required.
Guaranteed Compatibility and Performance
This is a quality, tested used part sourced from a salvaged vehicle, ensuring OEM-level function. We flash it with the latest GM software updates specific to your Vehicle Identification Number (VIN). This process ensures it works seamlessly with your engine, transmission, and all related systems. This module is a direct replacement for part numbers 09366810, 09355699, 16266645, 16250279, and 16258815, and fits a huge range of GM trucks, vans, and SUVs from this era. Please provide your VIN upon purchase so we can ensure a perfect match for your vehicle.