Get Your GM Truck Back on the Road, Fast.
Is your trusty 1998-1999 Chevy, GMC, or Cadillac suddenly running rough, stalling, or refusing to start? Before you start throwing expensive parts at it, the problem could be its electronic brain: the Powertrain Control Module (PCM). When the PCM fails, it can cause a host of frustrating and hard-to-diagnose issues. This isn’t just a replacement part; it’s a complete, ready-to-install solution designed to get your vehicle running smoothly again without a trip to the dealership.
Common Symptoms & Your Solution
A failing PCM can make you feel like you’re chasing ghosts in your vehicle’s electrical system. If you’re experiencing any of the following, our programmed 09355699 PCM is the reliable fix you’ve been looking for:
- Engine stalling or cutting out unexpectedly
- Harsh or erratic transmission shifting
- No communication with your OBD2 scan tool
- Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error)
- Poor fuel economy or a noticeable loss of power
- Vehicle is in “limp mode”
- Intermittent no-start condition
We take a quality, tested OEM computer and flash it with the latest official GM software updates, specifically matched to your vehicle’s VIN. This ensures that when you receive it, it’s ready to solve the problem right out of the box.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the unit using the VIN you provide, ensuring it communicates perfectly with your truck’s specific systems. This eliminates the need for expensive dealer programming.
- ✔ Flashed with Latest GM Updates: Your PCM will have the most current software from General Motors, often improving performance, shifting, and fuel efficiency over the original programming.
- ✔ Direct-Fit OEM Part: As a genuine OEM component, it guarantees a perfect fit for the original mounting brackets and wiring harnesses. No cutting, no splicing, no hassle.
- ✔ Cost-Effective Repair: Get the reliability and function you need at a fraction of the cost of a new computer from a dealership.
- ✔ Broad Compatibility: This single unit is the correct replacement for multiple part numbers, including 16266645, 16250279, and more, covering a wide range of popular GM trucks, vans, and SUVs.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Insight on These “Black Box” Computers
As a technician, I’ve seen countless of these late-90s GM vehicles with baffling issues that all traced back to the PCM. These units, often called the “Black Box” Vortec computers, are generally robust, but after 20+ years of heat cycles under the hood, the internal circuit boards and solder joints can develop microscopic cracks. This leads to the intermittent problems that drive owners crazy. Simply grabbing another one from a salvage yard is a gamble—it might have the same issue, and it will still need to be programmed by a dealer. Our service solves both problems: we provide a tested unit and program it for you, giving you the most reliable and straightforward path to getting your truck back to work.
Frequently Asked Questions
What information do I need to provide after ordering?
After you complete your purchase, you must send us your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we have this information, as we use it to program the computer specifically for your truck or van.
Is this part truly “plug and play”?
Yes, for the most part. The engine and transmission programming is complete. However, on these GM vehicles, you will likely need to perform a simple security relearn procedure after installation. This syncs the new PCM to your vehicle’s anti-theft system and can usually be done in your driveway in about 30 minutes with just the ignition key. We can provide instructions for this simple process.
How do I confirm this is the right part number for my vehicle?
The best way is to check the part number on your original PCM. It’s typically located on a sticker on the computer itself, which is found in the engine bay. This unit replaces several part numbers, including 09355699, 16266645, and 9355699. If your number is on our list, this part will work.
Is this a used computer?
Yes, this is a thoroughly inspected and tested computer sourced from a salvaged vehicle. We verify its functionality before programming it with the latest GM software for your VIN, providing a reliable and affordable alternative to a new unit.
Will this programmed 09355699 PCM fix my vehicle’s problem for sure?
This module will correct any issues directly caused by a faulty PCM. While the symptoms we listed are very common for PCM failure, it’s essential to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty sensors, wiring, or mechanical components.