Restore Peak Performance to Your GM Truck or SUV
Is your 1998 GMC Envoy, Chevrolet Tahoe, or Suburban running rough, stalling, or refusing to start? Are you battling a persistent Check Engine Light with confusing error codes? The problem may not be a sensor or mechanical part, but the very brain of your vehicle: the Powertrain Control Module (PCM). This genuine used GM PCM, part number 09355699, is the reliable and cost-effective solution to get your vehicle back on the road with confidence.
The PCM is the central command center for your engine and transmission. It processes data from dozens of sensors to precisely control fuel injection, ignition timing, transmission shift points, and emissions systems. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. Replacing a faulty module with a generic, unprogrammed unit from a local parts store often leads to more problems, as it lacks the specific software your vehicle requires.
The VIN-Programmed Advantage: A True Plug-and-Play Solution
Our service sets us apart. We don’t just sell you a part; we provide a complete solution. Before this module ships, our technicians will program it using your vehicle’s unique 17-digit Vehicle Identification Number (VIN). This critical step ensures the PCM is loaded with the correct factory software and the latest updates from General Motors for your specific make, model, engine, and options. This eliminates compatibility guesswork and ensures a seamless installation process, restoring your vehicle’s original performance and efficiency.
From the Diagnostic Bay
We once had a customer with a ’99 Suburban who was about to give up. His truck had an intermittent no-start condition. He had replaced the fuel pump, the fuel filter, and the ignition coil, spending hundreds of dollars with no success. The truck would run fine for days, then suddenly refuse to start. When he finally brought it to us, we found no fuel pump activation. Instead of throwing another pump at it, we checked the signal from the PCM to the fuel pump relay. There was none. The original PCM had a failing driver circuit. We installed a VIN-programmed module, and the truck fired up instantly and never had the problem again. It’s a classic case of symptoms pointing one way, while the root cause lies with the computer.
Common Symptoms of a Failing 1998 Envoy PCM
If you’re experiencing any of the following issues, a faulty engine computer could be the culprit. A failing PCM can mimic many other mechanical problems, so it’s crucial to consider it as a potential cause.
- ✔ Persistent Check Engine Light (CEL) illuminated on your dash.
- ✔ Engine stalling, stumbling, or running rough for no apparent reason.
- ✔ A complete no-start condition where the engine cranks but won’t fire.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel economy.
- ✔ Failure to pass an emissions test.
- ✔ Communication errors when trying to scan the vehicle with a diagnostic tool (e.g., U-codes).
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for part number 09355699 and several other interchangeable part numbers, including 16266645, 16250279, and 16258815. It fits a wide range of 1998 and 1999 GM vehicles, including the Chevrolet Express Van, GMC Savana, Cadillac Escalade, Chevy S10, and many full-size pickups. Please verify your part number and consult the detailed fitment list to ensure this is the correct part for your vehicle. Once you receive your pre-programmed module, installation is straightforward. In most cases, you will simply disconnect the battery, swap the modules, and reconnect the battery. Some vehicles may require a simple security relearn procedure, which can typically be performed without special tools.
Frequently Asked Questions
What information do I need to provide for programming?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN. This is essential for us to load the correct GM software and updates for your specific vehicle configuration.
Is this part difficult to install?
For most DIY mechanics, installation is manageable. The PCM is typically located in the engine bay. The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. Some vehicles may require a security relearn procedure, which can often be done at home.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of your original PCM, then yes, this replacement module will resolve the issue. However, if the light is on due to a faulty sensor or other mechanical problem, you will still need to address that separate issue.
Why should I buy a used OEM computer?
Used Original Equipment Manufacturer (OEM) modules are an excellent value. They are built to GM’s high-quality standards and, when properly tested and programmed, offer the same reliability as a new part at a fraction of the cost.
What happens if I forget to provide my VIN?
We cannot ship your order without the VIN, as the programming is a critical part of the product. Your order will be placed on hold, and we will contact you to retrieve the necessary information. Providing the VIN at checkout ensures the fastest possible processing and shipping.