Is Your GM Truck or Van Running Rough?
If your late-90s Chevrolet or GMC vehicle is experiencing frustrating issues like stalling, no-start conditions, erratic transmission shifting, or a persistent check engine light with baffling codes, the root cause is often a failing Powertrain Control Module (PCM). This central computer is the brain of your vehicle’s engine and transmission, and when it starts to fail, it can create a cascade of problems that are difficult to diagnose. Don’t let a faulty computer keep your reliable truck or van off the road. This is your direct-fit, VIN-programmed solution.
From the Diagnostic Bay
I once had a 1999 Suburban in the shop with what the owner was convinced was a failing transmission. It was shifting hard, hunting for gears, and occasionally throwing a transmission-related code. He had already spent a small fortune on a fluid flush and a new solenoid pack with no improvement. After hooking up my scanner and watching the live data, I noticed the PCM was sending erratic signals to the transmission. The computer itself was the culprit, not the transmission. We swapped in a VIN-programmed PCM like this one, performed the security relearn, and the truck drove like it just rolled off the assembly line. It’s a classic case of the brain telling the body to do the wrong thing.
Symptoms of a Failing GM PCM
A failing engine computer can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your PCM needs replacement:
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or cutting out while driving
- ✔ Difficulty starting or a complete no-start condition
- ✔ Poor engine performance and reduced fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ False sensor failure codes (e.g., O2 sensors, MAP sensor)
Why Choose Our Programmed GM Engine Computer 09355699?
This isn’t just a used part pulled from a yard. It’s a complete, ready-to-install solution. We take a genuine, tested, used GM PCM and flash it with the latest official GM software calibration specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN) after your purchase, you receive a module that is plug-and-play, eliminating the need for expensive dealership programming or specialized tools. This GM Engine Computer 09355699 is the most efficient and cost-effective way to restore your vehicle’s factory performance and reliability.
The Programming Process Explained
When you order, we require your vehicle’s VIN. Our technicians use this number to access the official GM database and download the exact software your vehicle needs. This ensures all parameters for the engine, transmission, fuel system, and emissions are set correctly for your specific make, model, and options. The module arrives at your door ready for installation. In most cases, the only additional step is a simple security relearn procedure (often called a CASE relearn), which can typically be done in your own driveway without any special tools. This synchronizes the new computer with your vehicle’s anti-theft system.
This module is a direct replacement for multiple part numbers, including: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Restore the proper function of your vehicle with this reliable and fully programmed GM Engine Computer 09355699.
Frequently Asked Questions
Do I need to do anything after installing this computer?
Yes, you will likely need to perform a security relearn procedure, also known as a Crankshaft Variation Relearn or CASE relearn. This can usually be done without special tools and involves a series of key cycles. Instructions are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, we will send you a message requesting your vehicle’s 17-digit VIN. We cannot program and ship the module until we receive this information. Please ensure it is accurate to avoid delays.
Is this a new part?
No, this is a high-quality, tested, used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
What if my original computer has a different part number?
This computer is a direct replacement for several part numbers, including 16266645, 16250279, and others listed in the description. As long as your original part number is on our cross-reference list, this module will fit and function correctly.
Will this fix my specific problem?
This part will resolve any issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the source of your problem before ordering.