Is Your 1998-1999 GMC Yukon Running Rough?
If your trusty GMT400-era Yukon, Tahoe, or Suburban is suddenly experiencing perplexing issues like stalling, erratic shifting, a persistent Check Engine Light, or even a no-start condition, the problem might be deeper than a simple sensor. The Powertrain Control Module (PCM), the electronic brain of your vehicle, is a common point of failure on these classic trucks. When it fails, it can create a cascade of problems that are often difficult to diagnose. Don’t let a faulty computer keep your truck off the road. This is the reliable, straightforward solution you need.
This is a genuine, used OEM Powertrain Control Module that has been meticulously tested and is ready for installation. The most critical part of the process is our professional programming service. Before this unit ships, we flash it with the latest official GM software updates, specifically matched to your vehicle using the VIN you provide. This ensures that your engine and transmission operate exactly as the manufacturer intended, restoring performance, fuel economy, and reliability. It’s a plug-and-play solution designed to get you back on the road with confidence.
From the Diagnostic Bay
We had a ’99 Suburban come in that had been to three other shops. The owner had replaced the fuel pump, injectors, and even the distributor, but it still had a random, intermittent stall and a harsh 1-2 shift. No specific codes were being stored consistently. After checking all the wiring and grounds, we hooked up our scanner and watched the live data. We noticed the injector pulse width was jumping all over the place for no reason. This pointed directly to the processor in the PCM. We swapped in a VIN-programmed module just like this one, performed the security relearn, and the truck ran perfectly. It’s a classic case where the core problem was the computer itself, not the parts it was controlling.
Symptoms of a Failing 1998-1999 Yukon PCM
A failing engine computer can manifest in numerous ways. If your vehicle is exhibiting any of the following symptoms, a faulty PCM could be the culprit:
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Poor fuel economy and reduced engine power.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Seemingly unrelated electrical issues or warning lights.
The Importance of VIN Programming
You cannot simply take a PCM from another truck and expect it to work. The PCM is the central hub that manages the engine, transmission, anti-lock brakes (ABS), and the anti-theft system (PassLock/VATS). Our VIN programming service ensures that the replacement module is a perfect digital match for your Yukon’s specific configuration, including:
- Engine and Transmission Calibration: Ensures optimal performance and shift points for your exact powertrain (5.0L, 5.7L, etc.).
- Anti-Theft System (VATS/PassLock): Allows the new PCM to communicate with your vehicle’s security system. A simple security relearn procedure will be required after installation.
- Emissions Equipment: Correctly configures the module for your vehicle’s specific emissions components.
- Gear Ratios and Tire Size: Calibrates the speedometer and transmission operation based on your factory specifications.
By providing us with your VIN, you eliminate guesswork and the need for expensive dealership programming. We deliver a module that is ready to be installed and synched with your vehicle.
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 engine and transmission function, including fuel injection, ignition timing, and transmission shifting, to ensure optimal performance, fuel efficiency, and emissions control.
Is this a new part?
No, this is a thoroughly tested, genuine OEM part sourced from a salvaged vehicle. These original units are often more reliable than aftermarket alternatives. We guarantee its function and program it specifically for your vehicle.
How do I provide my VIN?
After placing your order, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it. You can find your VIN on your vehicle’s registration, insurance card, or on the driver’s side dashboard viewable through the windshield.
Will I need to do anything after installing this PCM?
Yes. While the main programming is done, you will need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This procedure typically takes 10-30 minutes and does not require any special tools. We can provide instructions upon request.
Does this part fit other vehicles besides the Yukon?
Yes, this PCM, identified by service number 09355699, fits a wide range of 1998-1999 GM trucks, vans, and SUVs, including the Tahoe, Suburban, C/K Pickups, Express, Savana, and Escalade. Please check the detailed fitment list on this page to confirm compatibility.