Is Your 1998 Astro or Safari Giving You Headaches?
If you’re dealing with a no-start condition, a persistent Check Engine Light, erratic shifting, or a rough idle in your 1998 GM van or truck, the Powertrain Control Module (PCM) is a very likely culprit. As a mechanic with over two decades of experience, I’ve seen these exact issues hundreds of times. The PCM is the electronic brain of your engine and transmission, and when it fails, it can cause a host of confusing and frustrating problems that can be difficult to diagnose.
A Technician’s Real-World Experience
“A customer’s 1998 GMC Safari came into my shop last month. It would crank all day but wouldn’t fire up. The owner had already replaced the fuel pump and ignition coil with no luck. After connecting my scan tool, I found there was no communication with the PCM. We swapped in one of our tested and programmed modules, and the van fired up on the first try. The original PCM’s internal driver for the ignition system had failedโa common issue on these ‘black box’ style GM computers.”
The Plug-and-Play Solution: A VIN-Programmed PCM
Forget the immense cost and hassle of a dealership visit. This is a reliable, used OEM Powertrain Control Module that we program specifically to your vehicle’s VIN before it ships. This ensures that it works correctly with all the specific options and systems your vehicle came with from the factory. We also load the latest available software updates from GM, which can resolve drivability issues the original programming may have had.
- โ VIN Programmed for Your Vehicle: We flash this computer with your specific VIN, ensuring it’s a perfect electronic match.
- โ Latest GM Software Updates: Benefit from improved performance and reliability with the newest factory calibrations.
- โ Solves Common Issues: A direct fix for no-start, poor fuel economy, harsh shifting, and various Check Engine Light codes.
- โ Broad Compatibility: This module replaces several part numbers, including 09355699, 16266645, 16250279, and more.
Expert Pro Tip: Check Your Connectors!
Before plugging in your replacement PCM, take 60 seconds to inspect the vehicle’s harness connectors. Look for any green or white powdery corrosion on the pins or inside the connector housing. A bad connection is a leading cause of repeat module failure. If you see any corrosion, clean it thoroughly with a small brush and electrical contact cleaner to ensure a solid, long-lasting repair.
Easy Installation Guide for Your 1998 Astro PCM
You don’t need to be a master mechanic to replace this part. With basic hand tools, you can get your vehicle running right in your own driveway.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the 1998 Astro and Safari, the PCM is typically located in the engine compartment on the driver’s side, near the battery and coolant overflow tank.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. There are usually locking tabs that need to be released. Avoid forcing them.
- Remove the Old PCM: Unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the Replacement: Mount your new, pre-programmed PCM onto the bracket. Securely plug in the wiring harnesses, making sure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start. In some cases, a simple security relearn procedure may be necessary, which typically involves turning the key to the ‘On’ position for 10-15 minutes.
Important: After placing your order, please send us a message with your vehicle’s 17-digit VIN so we can program the module correctly before shipment. This is a crucial step to guarantee functionality.
Vehicle Fitment Information
This Electronic Control Module is a direct replacement for units with service ID number 9355699 and part numbers 09366810, 09355699, 16266645, 16250279, 16258815, 9366810. It fits a wide variety of 1998-1999 GM trucks and vans, including but not limited to:
- Chevrolet Astro & GMC Safari (1998)
- Chevrolet & GMC S10/S15/Sonoma, Blazer/Jimmy (1998)
- Oldsmobile Bravada & GMC Envoy (1998)
- Chevrolet Express & GMC Savana Vans (1998-1999)
- Chevrolet & GMC 1500/2500/3500 Pickups (1998-1999)
- Chevrolet Suburban/Tahoe & GMC Yukon (1998-1999)
- Cadillac Escalade (1999)
- Isuzu Hombre (1998)
Please verify your part number or service ID to ensure proper fitment for your specific application.