Is Your GM Truck or Van Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the electronic brain of your 1998 Chevrolet Astro and a wide range of other GM vehicles from that era. It meticulously manages everything from fuel injection and spark timing to transmission shifting and emissions controls. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems, often leading to a vehicle that is unreliable or completely undrivable. If you’re dealing with a persistent Check Engine Light, poor fuel economy, or erratic engine behavior, you’ve come to the right place for a reliable solution.
This is a genuine, used OEM Powertrain Control Module, service number 09355699. It has been carefully inspected and is ready to be programmed specifically for your vehicle. We eliminate the dealership hassle by flashing the module with the latest GM software updates using your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once you receive it, the module is a direct, plug-and-play replacement, restoring your vehicle’s factory performance and functionality.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe come into the shop with a classic complaint: intermittent stalling and a no-start condition when hot. The owner had already replaced the fuel pump, ignition coil, and crank sensor based on advice from forums, but the problem persisted. After connecting our scan tool, we noticed erratic data from multiple sensors and communication dropouts with the PCM. Instead of continuing to replace parts, we tested the PCM’s power and ground circuits, which were solid. The diagnosis pointed directly to an internal failure in the original engine computer. A replacement, VIN-programmed module like this one had the Tahoe running perfectly in under an hour, saving the owner from further expensive and unnecessary repairs.
Common Symptoms of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Poor or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Programmed 1998 Astro PCM?
Getting your vehicle back on the road shouldn’t be complicated. Our process is designed to be simple and effective. This module, identified by part number 09355699, is a direct replacement for a wide array of popular GM trucks and vans. It is a cost-effective alternative to a new dealership part without sacrificing quality or performance. The key to our service is the VIN-specific programming. By flashing the unit before it ships, we ensure it communicates flawlessly with the other modules in your vehicle, such as the Body Control Module and anti-theft system (if applicable). This means no expensive trips to the dealer for additional programming or setup procedures.
Guaranteed Compatibility
This electronic control module is a direct fit for vehicles requiring part number 09355699. It also interchanges with several other common part numbers, including 16266645, 16250279, 16258815, 09366810, and 9366810. It is compatible with a vast range of 1998 and 1999 GM models, including:
- Chevrolet Astro & GMC Safari (1998)
- Chevrolet Express & GMC Savana Vans (1500, 2500, 3500) (1998-1999)
- Chevrolet & GMC Pickups (1500, 2500, 3500) (1998-1999)
- Chevrolet Suburban & Tahoe (1998-1999)
- GMC Yukon & Cadillac Escalade (1998-1999)
- Oldsmobile Bravada, S10/S15 Blazer/Jimmy/Sonoma, Isuzu Hombre (1998)
Please verify your original part number matches one of the listed numbers to ensure proper fitment for your specific application.
Frequently Asked Questions
Do I need to do any programming after I receive this PCM?
No. We program the module with your vehicle’s VIN before we ship it. This makes it a plug-and-play installation. In some vehicles, a security relearn procedure may be required, which is a simple process you can do yourself in about 10-15 minutes without any special tools.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a new part?
This is a high-quality, used OEM part that has been sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped.
What if I order the wrong part?
We strongly encourage you to match your original part number to the ones listed in this description. If you are unsure, please contact us with your VIN before ordering, and we will be happy to verify compatibility for you.
Will this fix my vehicle’s problem for sure?
This PCM will resolve issues directly caused by a faulty engine computer. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty sensors, wiring issues, or mechanical failures.