Is Your GM Truck or Van Running Rough?
If your trusty 1998-1999 GM workhorse is suddenly stalling, shifting erratically, or refusing to start, the problem often points to a failing Powertrain Control Module (PCM). A faulty PCM can disrupt everything from fuel delivery to ignition timing, leaving you stranded and costing you valuable time. This isn’t just an inconvenience; it’s a critical failure that compromises your vehicle’s reliability. We provide the definitive, hassle-free solution to get your vehicle back in service quickly and correctly.
Common Symptoms of a Failing GM PCM & Your Solution
A failing engine computer can manifest in numerous ways. If you’re experiencing any of the following, a replacement is likely needed:
- Persistent Check Engine Light (CEL) with codes like P0601, P0602, or P0606
- Engine stalling or cutting out unexpectedly
- Rough idling or misfires
- Noticeable decrease in fuel economy
- Harsh or unpredictable automatic transmission shifting
- Complete no-start condition where the engine cranks but won’t fire
This unit is the direct answer to these issues. We offer a dependable, tested OEM Programmed 9355699 PCM that arrives at your door ready for installation. By providing us with your vehicle’s VIN, we flash the module with the latest official GM software calibrations specific to your truck or van. This crucial step ensures all components communicate perfectly, restoring factory performance and reliability without a costly trip to the dealership.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the computer with your specific VIN and the latest GM updates, ensuring it’s a true plug-and-play solution.
- ✔ Restores Peak Performance: Correct programming restores proper fuel trims, ignition timing, and transmission shift points for a smooth, efficient ride.
- ✔ Cost-Effective Solution: Get a fully functional, tested OEM computer for a fraction of the price of a new unit from a dealer.
- ✔ Broad Compatibility: This module is the correct replacement for a wide range of popular GM models, including Express, Savana, C/K Pickups, Tahoe, and Yukon (see full fitment list).
- ✔ One-Year Replacement Warranty: This unit is backed by our one-year replacement warranty for your peace of mind.
Expert Insight: Why VIN Programming is Non-Negotiable
On these late-90s GM vehicles, the PCM is the central nervous system. It doesn’t just manage the engine; it communicates with the transmission, the anti-lock brake system, and even the instrument cluster. Simply installing a used computer from another vehicle will almost always result in a no-start condition due to the integrated Vehicle Anti-Theft System (VATS) or Passlock security. Our VIN-specific programming correctly calibrates the module and syncs it to your vehicle’s security system, making the installation process straightforward and successful.
Don’t let a bad computer keep your vehicle sidelined. This Programmed 9355699 PCM is the most reliable and efficient way to solve complex electronic issues and restore the dependability you rely on every day.
Frequently Asked Questions
Do I need to do anything after I install this PCM?
In most cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle two more times. This allows the PCM to synchronize with your vehicle’s anti-theft system. We include instructions to guide you through this simple process.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you can add your 17-digit VIN to the ‘notes’ section of your order. If you forget, we will contact you via email to request it before we program and ship the module.
Is this a new computer?
No, this is a thoroughly tested, fully functional OEM computer that has been sourced from a salvaged vehicle. This allows us to provide a reliable, factory-grade part at an excellent value.
Will this fix my Check Engine Light?
This PCM will resolve any diagnostic trouble codes (DTCs) that are directly caused by a faulty computer itself. However, if your Check Engine Light is on due to other issues (like a bad sensor or wiring problem), those issues will still need to be addressed separately.
My original part number is different. Will this still work?
Yes. This module is a direct replacement for all part numbers listed in the description, including 09355699, 16266645, and 09366810. As long as your vehicle is on our compatibility list and we program it to your VIN, it will function correctly.
How long does the programming process take?
Programming is typically completed within one business day after we receive your valid VIN. We understand the urgency of getting your vehicle repaired and strive to ship your part as quickly as possible.