Is your 1998 or 1999 GM truck or van running rough, stalling, or showing a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission performance. Don’t let a faulty computer keep you off the road. This genuine, used OEM PCM, part number 09355699, is the reliable and cost-effective solution to restore your vehicle’s performance and drivability.
The PCM is the brain of your vehicle, responsible for calculating everything from fuel mixture and ignition timing to transmission shift points and emissions control. When it starts to fail, it can create a cascade of confusing and frustrating problems. Replacing it with a generic, non-programmed unit from a local auto parts store can lead to more headaches, compatibility issues, and a vehicle that still won’t run correctly. Our solution eliminates that guesswork.
We take a tested, functional PCM from a salvaged vehicle and program it specifically for YOUR truck or van using your Vehicle Identification Number (VIN). This process ensures that the module has the correct software and calibrations for your specific engine, transmission, and options package. We load the latest updates available from GM, so you’re not just getting a replacement part—you’re getting a component with the most current software to optimize performance and efficiency.
Is Your Truck’s Brain Failing? Common PCM Symptoms
A failing 1998-1999 GMC 1500 PCM can manifest in various ways. If you’re experiencing any of the following issues, your engine computer could be the culprit:
- ✔ Persistent Check Engine Light (CEL) on your dashboard.
- ✔ Engine stalling or cutting out unexpectedly.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ The vehicle won’t start, but the battery and starter are good.
- ✔ Failure to pass an emissions test.
- ✔ Communication errors with diagnostic scan tools.
The VIN Programming Advantage
Ordering this module is simple and effective. After your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians will then use this information to flash the module with the exact GM-specified software for your vehicle. This critical step ensures seamless integration and proper function of all powertrain systems. This unit is a direct replacement for multiple part numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810.
This module fits a wide range of GM vehicles from 1998-1999, including the Chevrolet/GMC 1500, 2500, and 3500 Pickups, Suburban, Tahoe, Yukon, Express and Savana vans, as well as the S10/Blazer and Jimmy platforms. Please verify your original part number or consult the detailed fitment list to confirm compatibility.
Please note that after installation, you may need to perform a security relearn procedure (often called VATS or Passlock). This is a simple process that pairs the new PCM to your vehicle’s anti-theft system and can typically be done in your driveway with just the ignition key. Instructions for this procedure are widely available online or in your vehicle’s service manual.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of the engine and transmission, such as fuel injection, spark timing, and gear shifting, to ensure optimal performance, fuel efficiency, and low emissions.
How do I provide my VIN for programming?
After you complete your purchase, we will contact you for your 17-digit Vehicle Identification Number (VIN). You can also send it to us via direct message. We cannot ship the part until we have programmed it with your VIN.
Will I need to do anything after installing this PCM?
Yes. After installation, you will likely need to perform a security relearn procedure. This syncs the new computer with your vehicle’s anti-theft system. It’s a simple procedure that usually takes 10-30 minutes and does not require special tools.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. We then program it with the latest GM software for your specific VIN.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, if the light is on due to other failing sensors or components, those issues will still need to be addressed separately.