Is Your 1998 Astro Van Running Rough, Stalling, or Refusing to Start?
If you’re dealing with a persistent check engine light, erratic engine behavior, or transmission shifting problems in your 1998 Chevrolet Astro, a failing Powertrain Control Module (PCM) is often the culprit. Over my 20+ years turning wrenches, I’ve seen hundreds of these GM vehicles exhibit frustrating, hard-to-diagnose symptoms. One week, a customer’s ’98 Safari (the Astro’s twin) came into the shop with an intermittent no-start and a random misfire code that would come and go. After checking all the usual suspects—plugs, wires, fuel pressure—we traced the issue to the original PCM. The internal circuits had developed microscopic cracks from years of heat cycles, causing unpredictable failures. A replacement PCM solved everything instantly.
This isn’t just a replacement part; it’s a direct solution. This is a genuine, used GM PCM that has been meticulously tested and is ready for a new life in your vehicle. We take the hassle out of the repair by programming the module specifically for your van using your Vehicle Identification Number (VIN). This ensures all factory settings and communication protocols are perfectly matched to your vehicle’s specific options.
Why Choose Our Pre-Programmed 1998 Astro PCM?
Getting your vehicle back to factory-spec performance shouldn’t require a trip to the dealership and an expensive bill. This module is the smart, efficient way to fix your vehicle correctly.
- ✔ VIN-Programmed for You: We flash the module with the latest GM software updates using your VIN. This ensures it works seamlessly with your engine, transmission, and anti-theft system right out of the box.
- ✔ Solves Common Issues: A direct fix for symptoms like harsh shifting, false sensor codes, poor fuel economy, stalling, and no-start conditions related to a faulty computer.
- ✔ Cost-Effective Repair: Get a reliable, tested OEM part for a fraction of the cost of a new module from a dealer.
- ✔ Broad Compatibility: While perfect for the 1998 Astro, this module also services a wide range of GM trucks and vans.
Expert Pro Tip: After installing this PCM, a Crankshaft Position System Variation (CASE) relearn procedure is often required using a capable scan tool. This synchronizes the new PCM with your engine’s crankshaft sensor, preventing a P1336 trouble code and ensuring smooth performance. Skipping this step is a common cause of post-installation issues and is something we see all the time in the shop.
Simple, Straightforward Installation
You can do this. The installation is plug-and-play, and no complex wiring is needed. For the 1998 Astro, the PCM is typically located in the engine compartment on the driver’s side, near the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting work.
- Locate the PCM: Find the existing module in your Astro’s engine bay.
- Disconnect Harnesses: Carefully unclip the wiring harness connectors from the old module. Inspect the connectors for any corrosion or bent pins and clean them if necessary.
- Swap the Modules: Unbolt and remove the old PCM. Mount your new, pre-programmed module in its place.
- Reconnect Everything: Securely plug the wiring harnesses into the new PCM and reconnect your battery terminal.
- Final Steps: Start the vehicle. As mentioned in our pro tip, a CASE relearn may be necessary to complete the process and clear any related codes.
Guaranteed Fitment
This computer is a direct replacement for units with the service number 16258815 or any of the following interchangeable part numbers: 09355699, 16266645, 9355699, 16250279, 09366810, 9366810. It is compatible with a wide array of 1998-1999 GM models including the Chevrolet Express, GMC Savana, Chevrolet/GMC Pickups (1500, 2500, 3500), Suburban, Tahoe, Yukon, S10, Blazer, Jimmy, and more, as long as the ID matches 9355699. Please provide your VIN upon purchase so we can confirm compatibility and program the module correctly before shipping.