Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 GMC Yukon, Chevy Tahoe, or Suburban running rough, stalling, or refusing to start? Are you battling a persistent Check Engine Light with codes that point to a computer failure? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the electronic brain of your vehicle. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This genuine OEM PCM, part number 09355699, is the reliable, cost-effective solution to get your truck back on the road and running smoothly.
From the Diagnostic Bay
I once had a ’99 Suburban in the shop that was driving the owner crazy. It would randomly stall at red lights and sometimes wouldn’t start for an hour. He had already replaced the fuel pump, crank sensor, and ignition control module based on advice from forums. After hooking up our scanner, we noticed the 5-volt reference signal to the sensors was erratic. Instead of continuing to replace parts, we tested the circuits directly at the PCM connectors. The signal was unstable coming *out* of the module. We installed a pre-programmed PCM just like this one, performed the security relearn, and the truck ran perfectly. It’s a classic case where the root cause was the central computer, not the individual components it controls.
Is Your GM Truck’s Brain Failing?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty module could be the culprit:
- ✔ Check Engine Light is on with various, often inconsistent, trouble codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle fails to communicate with a diagnostic scan tool.
- ✔ Intermittent issues that seem to have no logical cause.
The Simple, Programmed Solution for Your 1998-1999 Yukon PCM
Don’t waste time and money at the dealership. We make this process simple. This is a tested, functional PCM sourced from a salvaged vehicle. The key benefit is our professional programming service. When you place your order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the module with the latest official GM software specific to your truck’s configuration. This ensures that the engine parameters, transmission shift points, and all factory options are correctly calibrated for your exact vehicle.
This module is a direct replacement for part number 09355699 and also interchanges with the following part numbers: 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It fits a massive range of popular GM trucks, SUVs, and vans from 1998-1999, including the Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Express, Savana, and many more. Please verify the part number on your original module to ensure a perfect match.
Installation is straightforward for any DIY mechanic or professional technician. Once you receive the programmed module, simply disconnect the vehicle’s battery, unbolt and unplug your old PCM, and install this one in its place. After reconnecting the battery, you will likely need to perform a simple security relearn procedure, which typically does not require special tools. This restores communication between the PCM and your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to program this PCM?
No. This PCM comes pre-programmed to your vehicle’s specific VIN. You must provide your VIN after purchase so we can load the correct GM software before shipping it to you. This makes the installation process much simpler.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. An ECM (Engine Control Module) typically only controls engine functions. A PCM (Powertrain Control Module) controls both the engine and the transmission. For these 1998-1999 GM vehicles, this unit is a PCM as it manages both systems.
Will I need to perform a security or CASE relearn?
You will most likely need to perform a security relearn (also known as Passlock relearn). This procedure syncs the new PCM with your vehicle’s anti-theft system and can usually be done in your driveway by cycling the key. A Crankshaft Variation (CASE) relearn may be required to clear certain trouble codes and optimize engine performance, which typically requires a professional scan tool.
Why is my VIN so important?
Your Vehicle Identification Number (VIN) is like a fingerprint for your truck. It tells us the exact engine, transmission, emissions equipment, and other options it was built with. Programming the PCM with your VIN ensures all these systems are controlled correctly by the new computer.
Is a used part reliable?
Absolutely. This is a genuine OEM (Original Equipment Manufacturer) part that has been inspected and tested for full functionality. OEM electronics are often more durable and reliable than some aftermarket alternatives.