Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Chevrolet, GMC, or Cadillac truck suffering from erratic behavior? Issues like a persistent Check Engine Light, rough idling, stalling, or a complete no-start condition often point directly to a failing Powertrain Control Module (PCM). This module is the brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it falters, the entire vehicle’s performance and reliability are compromised. This replacement PCM, part number 9355699, is the definitive solution to get your trusted vehicle running smoothly again.
The Plug-and-Play Solution: Pre-Programmed for Your Vehicle
Replacing a PCM isn’t just about swapping hardware. The module must be correctly programmed with your vehicle’s specific Vehicle Identification Number (VIN) and the latest factory software to function. We handle this critical step for you. Before shipping, we flash this module with the newest updates from GM, tailored specifically to your VIN. This ensures seamless integration with your truck’s existing systems, eliminating the need for an expensive trip to the dealership. Once it arrives, installation is straightforward, making it a true plug-and-play repair.
From the Diagnostic Bay
I once had a 1999 Suburban towed in with a classic no-start condition. The owner had already replaced the fuel pump and filter, convinced it was a fuel delivery issue. The engine would crank but never fire. After hooking up the scan tool, I found there was no communication with the PCM. A quick check of the main power and ground circuits to the module confirmed they were good. The culprit was an internally shorted PCM. We installed one of these VIN-programmed units, and the truck fired up on the first turn of the key. It’s a reminder that what seems like a mechanical fault can often be an electronic one, and having a reliable, correctly programmed module is key to an accurate and lasting repair.
Diagnosing a Faulty 1998-1999 Chevy 2500 PCM
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, your engine computer may be the root cause. Proper diagnosis is essential, but these symptoms are strong indicators that your Chevy 2500 PCM is on its way out.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes, especially those related to internal module failure or communication errors.
- ✔ Engine stalling unexpectedly or refusing to start at all.
- ✔ Rough or unstable engine idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Intermittent issues that seem to have no clear cause.
Guaranteed Compatibility and Reliability
This is a genuine, used GM component sourced from a salvaged vehicle, ensuring OEM quality and fitment. It is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. We have meticulously tested this module to ensure it is fully functional and ready for programming. By providing us with your VIN, you are guaranteed to receive a part that is 100% compatible with your vehicle’s specific configuration, restoring its original factory operation.
Frequently Asked Questions
Do I need to do any programming or flashing myself?
No. This PCM comes fully programmed to your vehicle’s VIN with the latest GM software updates. It is ready for installation right out of the box. You will need to perform a security relearn procedure after installation, which is a simple process that can be done without special tools.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part. Sourcing a used original part ensures perfect compatibility and the robust build quality of the original factory component.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add this in the notes section during checkout or send it to us in a message referencing your order number. We cannot ship the part until we receive your VIN.
Where is the part number located on my old PCM?
The part number is printed on a sticker on the case of your original PCM. It’s typically a large, bold number. This unit replaces several part numbers, so as long as your original matches one listed, you’re good to go.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the electronic portion of the transmission control is failing within the module, a replacement PCM can resolve erratic shifting, failure to shift, or incorrect gear engagement.