Is Your 1998 Chevy Astro Running Rough, Stalling, or Refusing to Start?
As a mechanic with over two decades of experience, I’ve seen countless GM vans and trucks from this era roll into the shop with frustrating, intermittent problems. The owner has often replaced the fuel pump, ignition coil, and sometimes even the distributor, yet the issue persists. More often than not, the culprit is a failing Powertrain Control Module (PCM). If your Astro is experiencing erratic behavior, poor fuel economy, or has a persistent Check Engine Light, you’ve likely found the source of your headache.
The Smart Solution: A VIN-Programmed OEM Module
Don’t waste time and money at a dealership. This is a reliable, tested, used OEM Electronic Control Module that solves the problem without the high cost. The most critical part of the service we provide is that we flash this computer with the latest GM software updates, programmed specifically to your vehicle’s VIN before we ship it. This ensures it communicates perfectly with your van’s systems right out of the box, making the installation straightforward and eliminating the need for expensive dealer-only tools.
From the Shop Floor: “A customer’s 1998 Astro work van came in last week. It would die at stoplights unpredictably, but always start back up. No consistent codes, just a history of random misfires. We checked fuel pressure and spark, which were fine. On a hunch, I tapped the PCM casing with a screwdriver handle while it was idling, and the engine stumbled immediately. That’s a classic sign of internal circuit board failure. We installed one of these VIN-programmed modules, and the van has been running flawlessly for him ever since. It’s a fix I’ve performed hundreds of times on these GM platforms.”
Common Symptoms of a Failing 1998 Astro PCM:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Engine stalling or cutting out while driving
- ✔ Harsh or incorrect transmission shifting
- ✔ No-start condition where the engine cranks but won’t fire
- ✔ Noticeable drop in fuel mileage
- ✔ Communication errors with diagnostic scan tools
Plug-and-Play Installation: No Dealer Visit Required
Replacing the PCM is a job you can do in your own driveway. Follow these simple steps to get your Astro back in top shape.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On the 1998 Astro, the PCM is typically located in the engine compartment, on the driver’s side, near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. Inspect them for any green or white corrosion.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket. Firmly reconnect the electrical harnesses until they click into place.
- Reconnect the Battery: Re-attach the negative battery terminal. The vehicle is now ready to start.
Expert Pro Tip: Ensure a Perfect Connection
Before plugging the connectors into your new PCM, take a moment to spray the vehicle’s harness-side connectors with a quality electronics cleaner. Use a small, soft brush (like a toothbrush) to gently scrub away any dust or potential corrosion from the pins. A clean connection is vital for the long-term health and performance of your new computer.
Guaranteed Compatibility
This module is a direct replacement for units with service ID 9355699 and part numbers 09366810, 9366810, 09355699, 16266645, 16250279, or 16258815. It is compatible with a wide range of 1998-1999 GM and Isuzu vehicles. Please verify your part number or Service ID to ensure a perfect match. After purchase, simply provide us with your VIN, and we’ll handle the programming.