Is Your GM Truck or Van Running Rough?
If you’re dealing with a no-start condition, erratic shifting, a persistent check engine light, or poor fuel economy in your late-90s GM vehicle, the Powertrain Control Module (PCM) is often the culprit. As a mechanic with over two decades of experience, I’ve seen these symptoms countless times on the shop floor. The PCM is the electronic brain of your vehicle, managing everything from fuel injection and spark timing to transmission shift points. When it fails, it can cause a cascade of frustrating and hard-to-diagnose problems.
The Direct-Fit, Programmed Solution
This isn’t just a used part pulled from a salvage yard; it’s a complete, ready-to-install solution. We take a genuine, tested OEM PCM with service number 9355699 and flash it with the latest official GM software updates. Most importantly, we program it specifically to your vehicle’s 17-digit Vehicle Identification Number (VIN) before it ships. This critical step ensures all systems communicate correctly, eliminating the need for an expensive trip to the dealership for programming.
Real-World Diagnostic Story
“A customer’s 1999 Suburban came in last week with an intermittent no-start and a random P0300 misfire code. The previous shop wanted to replace the PCM immediately. From experience, I know these GMT400-platform trucks have a common weak point: the main engine-to-frame ground strap. Before condemning the computer, we spent five minutes cleaning the ground connection points on the frame rail and the back of the cylinder head. The truck started perfectly and the code never returned. Always check your main power and ground connections before replacing a moduleโit can save you hundreds!”
Why Choose a VIN-Programmed PCM?
- โ Guaranteed Compatibility: By using your VIN, we ensure the software matches your engine, transmission, and factory options perfectly.
- โ Resolves Common Failures: Effectively corrects issues like harsh 1-2 shifts, engine stalling, communication errors, and false sensor codes.
- โ True Plug-and-Play: No additional programming or key relearn procedures are typically required. Just install it and turn the key.
- โ Latest GM Updates: Your module arrives with software improvements from GM that address known bugs and enhance performance and drivability.
Easy Installation for Your 1998-1999 Yukon PCM
You can get your truck back on the road in under 30 minutes with basic hand tools. This module is a direct replacement for a wide range of GM vehicles, including the Chevy Tahoe, Suburban, Express/Savana vans, and S10/Blazer models that use part number 9355699.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most trucks and SUVs like the Yukon and Tahoe, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors from the old PCM. There are usually retaining clips that need to be released.
- Swap the Modules: Unbolt the old PCM from its bracket and install the new one in its place.
- Reconnect and Finalize: Securely plug the harness connectors into your new, programmed PCM. Reconnect the negative battery terminal. Your vehicle is now ready to start.
Important: After placing your order, please send us your vehicle’s VIN. We cannot ship your part until we have this information to complete the programming process. This ensures you receive a part that works correctly right out of the box.