Is Your Truck or Van Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle’s engine management system. It’s the brain behind the operation, controlling everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail on your late-90s GM truck or van, it can cause a host of confusing and frustrating problems, often leaving you stranded. This genuine, used OEM Powertrain Control Module, part number 09355699, is the reliable and cost-effective solution to get your vehicle running smoothly again.
From the Diagnostic Bay
I remember a 1999 Chevy Tahoe that came in on a tow truck. The owner said it would run fine for days, then suddenly die at a stoplight and refuse to restart for an hour. He’d replaced the fuel pump, crank sensor, and ignition module, but the problem persisted. There were no hard codes stored, just a history of communication loss with the PCM. We suspected the module was failing internally when it got hot. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the Tahoe fired right up. The customer called a month later to say his truck had never run better and the intermittent stalling was completely gone. Sometimes, the simplest solution is the right one.
The Plug-and-Play Advantage: VIN Programming Included
Don’t waste time and money towing your vehicle to a dealership for expensive programming. We take the guesswork out of the repair. Before this module ships, our technicians will flash it with the latest GM-certified software updates and program it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that the PCM recognizes all your vehicle’s systems and options, making for a much smoother installation process. Once installed, you may only need to perform a simple security relearn procedure, which can often be done in your own driveway without any special tools.
Diagnosing a Faulty GM PCM 09355699
A failing powertrain computer can mimic many other component failures, making it difficult to diagnose. If you’re experiencing any of the following symptoms, a faulty PCM is a likely cause. This replacement GM PCM 09355699 is designed to resolve these exact issues and restore your vehicle’s factory performance and reliability.
Common Symptoms of a Bad PCM
- ✔ Check Engine Light is on, often with U-codes (communication) or P-codes related to processor failure.
- ✔ Engine stalls intermittently, especially after warming up.
- ✔ Vehicle cranks but will not start.
- ✔ Rough or erratic engine idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ No communication with the OBD-II port when using a scan tool.
Guaranteed Fitment and Compatibility
This module is a direct replacement for several part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. It fits a wide range of popular 1998 and 1999 General Motors vehicles, from the Chevy Silverado and GMC Sierra pickups to the Tahoe, Suburban, and Express/Savana vans, as well as the Isuzu Hombre and Oldsmobile Bravada. Please verify your original part number and consult the detailed fitment list to ensure this is the correct component for your specific year, make, and model. Installing the correct, VIN-programmed GM PCM 09355699 is the key to a successful and lasting repair.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your vehicle’s specific engine, transmission, and factory options. This ensures compatibility and proper function right out of the box.
Is this part ready to install when it arrives?
Yes, the module comes programmed to your VIN and is ready for physical installation. After installation, you will likely need to perform a simple, tool-free security relearn procedure (often called a VATS or Passlock relearn) to sync the PCM with your vehicle’s anti-theft system. Instructions for this are widely available online or in your vehicle’s service manual.
What is a security relearn procedure?
It’s a sequence of key-on/key-off steps that allows your vehicle’s Body Control Module (BCM) and the new PCM to recognize each other. It’s a necessary security step that typically takes about 30 minutes to complete in your driveway.
Is this a new part?
No, this is a genuine, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped. This provides OEM quality and reliability at a fraction of the cost of a new unit.
Will this PCM fix my vehicle’s problem for sure?
This PCM is guaranteed to be a functional, correctly programmed replacement for a faulty module. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix issues caused by other faulty components like sensors, wiring, or fuel system parts.