Is Your GM Truck or Van Experiencing Mysterious Issues?
If your late-90s GMC or Chevrolet is suffering from erratic behavior like stalling, rough idling, a persistent check engine light, or strange transmission shifting, the problem might be deeper than a simple sensor. The Powertrain Control Module (PCM), often called the vehicle’s brain, is responsible for managing everything from fuel mixture and ignition timing to transmission shift points. When it begins to fail, it can cause a cascade of frustrating and hard-to-diagnose problems. This genuine, used OEM PCM, part number 09355699, is the reliable and cost-effective solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
A customer brought in a ’98 Chevy Express van with an intermittent no-start condition and occasional stalling at red lights. We checked all the usual suspects—fuel pump, ignition system, crank sensor—and everything tested fine. The codes were all over the place, pointing in different directions each time. After hours of chasing ghosts, we checked the PCM connectors for corrosion (they were clean) and decided to swap in a known-good test unit. The van fired up instantly and ran perfectly. The original PCM had internal circuit board failures that only showed up when warm. Replacing the module with a correctly programmed unit like this one solved every single issue and saved the customer from replacing more unnecessary parts.
Common Symptoms of a Failing PCM
- ✔ Persistent and illuminated Check Engine Light (CEL)
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Rough or erratic idling
- ✔ Difficulty starting the engine or a complete no-start condition
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or delayed transmission shifting
- ✔ Failed emissions test
- ✔ Communication errors with diagnostic scan tools
The Perfect Solution: A Programmed 1998 GMC Safari PCM
Don’t settle for a generic, one-size-fits-all module that requires expensive dealer programming. We take the guesswork and hassle out of the repair. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the latest, most stable GM factory software specific to your vehicle’s configuration. This ensures that it communicates flawlessly with your engine, transmission, and all other onboard systems right out of the box. This is a tested, used OEM unit, meaning it was built to GM’s rigorous standards for durability and performance.
Simple, Hassle-Free Process:
- Order: Complete your purchase for this PCM.
- Provide VIN: Reply to your order confirmation email with your vehicle’s 17-digit VIN.
- We Program: Our technicians will program the module with the correct GM software for your exact vehicle.
- Install: We ship the ready-to-install module directly to you. In most cases, installation is as simple as disconnecting the battery, swapping the modules, and reconnecting the battery. A security relearn procedure may be required, and we can provide instructions for this simple process.
Guaranteed Compatibility
This Electronic Control Module is a direct replacement for service number 09355699 and is interchangeable with the following part numbers: 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It is confirmed to fit a wide range of GM vehicles from 1998 and 1999, including the Chevrolet Astro, Express, Suburban, Tahoe, and various pickups, as well as the GMC Safari, Savana, Yukon, and Cadillac Escalade. Please verify your original part number to ensure a perfect match.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during checkout, and the module will arrive ready for installation.
What is a VIN and why is it so important?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your specific vehicle. It contains information about the make, model, year, engine, transmission, and other factory-installed options. We use this to load the precise software your vehicle needs to run correctly.
Is installation difficult? Can I do it myself?
For most DIY mechanics, installation is straightforward. It typically involves disconnecting the negative battery terminal, unplugging the electrical connectors from the old PCM, unbolting it, and then reversing the process with the new one. Some vehicles may require a simple security relearn procedure (also known as a CASE relearn), which can often be done without special tools.
How do I know for sure that my PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis performed. Key signs include multiple unrelated error codes, stalling when the engine is warm, and communication failures with a scan tool. If other components like sensors, wiring, and fuel delivery have been ruled out, the PCM is a very likely culprit.
Will this used part be reliable?
Absolutely. This is a genuine OEM (Original Equipment Manufacturer) part that has been inspected and tested. OEM electronics are known for their durability and are often more reliable than newly manufactured aftermarket alternatives.