Restore Peak Performance to Your GM Truck or Van
Is your 1998 Chevrolet Astro, GMC Safari, or another compatible GM vehicle suffering from perplexing engine issues? Unexplained stalling, rough idling, poor fuel economy, or a persistent check engine light can often be traced back to a failing Powertrain Control Module (PCM). This vital component is the central brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire system’s performance and reliability are compromised.
This is a genuine, used OEM PCM, service number 9355699, meticulously tested and ready for a new life in your vehicle. We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store, this unit is specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that all factory settings, security information (PassLock/VATS), and operational parameters are perfectly matched to your truck or van’s original specifications. This VIN-programming service, using the latest GM updates, is included with your purchase and is essential for a true plug-and-play installation.
From the Diagnostic Bay
I remember a 1999 Suburban that came in with a complaint of intermittent stalling and a P0300 (Random Misfire) code that just wouldn’t go away. The owner had already replaced the spark plugs, wires, cap, and rotor. We checked fuel pressure and for vacuum leaks, and everything seemed fine. After hours of chasing ghosts, we hooked up a scope to the injector drivers at the PCM. We found that the signal for cylinder 4 would occasionally drop out completely. The problem wasn’t in the wiring or the injector; the driver circuit inside the original PCM was failing. A replacement, VIN-programmed module like this one solved the problem instantly. It’s a reminder that sometimes the issue lies with the component controlling everything else.
Why Choose a VIN-Programmed 1998 Astro PCM?
The PCM in these late-90s GM vehicles is more than just an engine controller; it’s integrated with the anti-theft system (VATS/PassLock). Simply swapping a module from another vehicle will result in a no-start condition because the security credentials won’t match. Our programming service handles this critical step for you. By providing your VIN after purchase, you receive a module that is ready to be installed without the need for an expensive trip to the dealership for additional programming. This saves you time, money, and the frustration of a vehicle that won’t run.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various or no specific codes.
- ✔ Vehicle refuses to start or has difficulty starting.
- ✔ Engine stalling or shutting off randomly while driving.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough or erratic automatic transmission shifting.
- ✔ The engine runs rough, misfires, or hesitates on acceleration.
- ✔ Communication errors with diagnostic scan tools.
Replacing your faulty module with this pre-programmed 1998 Astro PCM is the most reliable way to resolve these issues and restore your vehicle’s dependability. This unit is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810, and fits a wide range of Chevrolet, GMC, Cadillac, and Isuzu models from 1998-1999. Please verify your part number and consult the detailed fitment list to ensure compatibility.
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the module until we have this information, as the programming is a necessary step.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part that has been sourced from a salvaged vehicle. It has been inspected to ensure it meets our quality standards.
Will I need to do any additional programming after installation?
In most cases, no. Because we program the PCM to your VIN, it should be a plug-and-play installation. However, some vehicles may require a simple security relearn procedure, which can typically be done without special tools. Instructions can be provided if needed.
What if my original part number is not 9355699?
This module is a direct replacement for several part numbers, including 16266645, 16250279, 16258815, and more as listed in the description. As long as your original part number is on our cross-reference list, this module will work for your vehicle.
Where is the PCM located on my 1998 Chevy Astro?
On a 1998 Chevrolet Astro or GMC Safari, the Electronic Control Module (PCM) is typically located in the engine compartment on the driver’s side, near the battery.