Is Your GM Truck or Van Running Rough?
If you’re dealing with mysterious engine problems in your 1998 Chevrolet Astro, GMC Safari, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) could be the culprit. As the central computer for your engine and transmission, a faulty PCM can cause a cascade of issues, from poor fuel economy and rough idling to a frustrating no-start condition. Don’t let a bad computer keep you off the road. This genuine, used OEM PCM is the reliable and cost-effective solution you need.
The Plug-and-Play Solution for Your 1998 Astro PCM
Replacing an engine computer isn’t just about swapping parts. The module must be correctly programmed to your vehicle’s unique Vehicle Identification Number (VIN) to communicate with all the other systems. We take care of the hard part for you. When you order, simply provide us with your VIN, and our technicians will flash this module with the latest, most stable software updates directly from GM. This ensures that when the part arrives, it’s ready for installation, saving you a costly trip to the dealership and expensive programming fees. It’s a true plug-and-play repair.
From the Diagnostic Bay
We had a customer with a ’98 Express Van that had been to three different shops. It had a random, intermittent stalling issue that no one could pinpoint. They had replaced the fuel pump, ignition coil, and even the distributor, but the problem persisted. When it finally got to our bay, we noticed some odd data readings from the MAP sensor and erratic injector pulse widths. After confirming all the wiring was solid, we suspected the PCM. We swapped in one of our pre-programmed modules, and the van ran perfectly. The original PCM had an internal fault that only showed up under specific load conditions. It’s a classic case where the ‘brain’ itself is the problem, not the parts it’s controlling.
Common Symptoms of a Failing Engine Computer
- ✔ Check Engine Light is on with various communication or sensor-related codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or erratic engine idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent issues that seem to have no other cause.
Guaranteed Compatibility and OEM Reliability
This module is a direct replacement for a wide range of GM trucks and vans from the late 1990s, specifically those using service numbers like 09366810, 09355699, 16266645, 16250279, and 16258815. Sourced from salvaged vehicles, each unit is carefully inspected and tested to ensure it’s ready for programming and a new life in your vehicle. Choosing a used OEM part means you get the durability and performance engineered by the original manufacturer, without the new-part price tag.
The installation process is straightforward for a DIY mechanic with basic tools. Once installed, some vehicles may require a simple Crankshaft Variation Relearn procedure (often called a CASE relearn) to sync the new PCM with the crankshaft position sensor. This can typically be done with a capable bi-directional scan tool.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before the part is shipped. You just need to provide your vehicle’s VIN at checkout. This makes the module ready for installation right out of the box.
Is this a new part?
No, this is a genuine, used OEM part that has been sourced from a salvaged vehicle. We inspect and verify its functionality before programming it for your specific vehicle.
What is a CASE Relearn and will I need to do one?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with your engine’s crankshaft position sensor. Many GM vehicles of this era require it after a PCM replacement to prevent a P1336 trouble code. It can be performed with most professional-grade scan tools.
How do I find my part number to ensure this is a match?
Your original PCM will have a sticker on it with the service number. This unit replaces multiple part numbers, including 09366810 and 09355699. As long as your vehicle is on the compatibility list, our VIN programming will ensure it works correctly.
What information do you need from me?
After you complete your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your vehicle. This is typically found on your driver’s side dashboard (visible through the windshield) or on the door jamb sticker.