Is Your GM Truck or Van Running Rough? Get a Reliable Solution.
If you’re dealing with a no-start condition, erratic shifting, a persistent check engine light, or poor fuel economy in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. Over my 20+ years in the shop, I’ve seen these exact symptoms hundreds of times on vehicles like the Astro, Express, and Suburban. The PCM is the brain of your engine and transmission, and when it fails, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just a part; it’s the key to getting your reliable workhorse back on the road.
A Real-World Scenario
Just last month, a ’98 Chevy Express 2500 was towed into my bay. The owner, a local plumber, said it died at a stoplight and wouldn’t restart. We checked for fuel and sparkโboth were present but weak and inconsistent. The scanner couldn’t even communicate with the computer. This is a classic sign of a fried PCM. We swapped in a VIN-programmed module just like this one, and the van fired up on the first crank. It’s a fix that saves time, money, and a massive headache.
Why Choose Our Pre-Programmed 1998 Astro PCM?
This isn’t just a used part pulled from a yard. We take a reliable, OEM-tested PCM and prepare it specifically for your vehicle. You get a cost-effective solution without the dealership price tag or the need for expensive programming tools.
- โ VIN Programmed for Your Vehicle: We flash this module with the latest GM software updates using your vehicle’s VIN. This ensures 100% compatibility and proper communication with all other systems.
- โ Direct Replacement: This unit is a direct fit for service number 9355699 and interchanges with several other part numbers, including 16266645, 16250279, and 16258815.
- โ Solves Common Issues: A replacement PCM is the definitive fix for problems like false sensor codes, harsh transmission shifts, stalling, and communication errors.
- โ Plug-and-Play Ready: Once you receive it, the module is ready for installation. In most cases, no additional security relearn procedures are required.
Easy Installation Guide
You can do this job yourself with basic hand tools. While the location varies slightly by model (check your service manual), the process is straightforward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most vans and trucks of this era, it’s located in the engine bay, often on the driver’s side fender or near the battery.
- Disconnect the Old Unit: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Swap the Modules: Unbolt the old PCM and install the new one in its place.
- Reconnect & Secure: Firmly plug the harness connectors into your new PCM until they click. Reconnect the negative battery terminal.
Expert Pro Tip
Before plugging in your new PCM, take a moment to inspect the harness connectors. Use a small brush and some electronics cleaner to remove any dirt or corrosion from the pins. A poor connection is the number one cause of repeat failures, and this simple step ensures a solid, lasting repair.
Guaranteed Fitment for Part Number 9355699
This module is a confirmed fit for a wide range of GM vehicles. Please verify your original part number is 9355699 or one of the compatible numbers listed below. After purchase, you must provide your VIN so we can program the unit correctly.
Compatible Part Numbers: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810
This module fits the following vehicles (with ID 9355699):
- 1998 Astro / Safari (GMC)
- 1998-1999 Chevrolet / GMC 1500, 2500, & 3500 Pickups (Gasoline)
- 1998-1999 Suburban 1500 & 2500 (Gasoline)
- 1998-1999 Tahoe / Yukon (Gasoline)
- 1998-1999 Express / Savana 1500, 2500, & 3500 Vans (Gasoline)
- 1999 Escalade
- 1998 Blazer S10 / Jimmy S15 (4.3L)
- 1998 S10 / S15 / Sonoma (4.3L)
- 1998 Bravada (4.3L)
- 1998 Envoy (4.3L)
- 1998 Isuzu Hombre (4.3L)