Is Your Late 90s GM Truck Running Rough?
If your 1998 or 1999 GMC Yukon, Tahoe, Suburban, or pickup is suffering from perplexing issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, the culprit is often a failing Powertrain Control Module (PCM). This computer is the brain of your vehicle’s engine and transmission, and when it malfunctions, it can cause a cascade of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable GM truck off the road. This is the direct, plug-and-play solution you need.
From the Diagnostic Bay
I once had a ’99 Suburban towed in that had its owner chasing his tail for weeks. The truck would randomly die at stoplights and had a harsh 1-2 shift. He had replaced the fuel pump, spark plugs, and even the ignition control module. After hooking up the scan tool, I noticed erratic data from the crank sensor, but the sensor itself tested fine. The root cause? A failing PCM was misinterpreting the signals. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck ran like it just rolled off the assembly line. It’s often the last part people suspect, but it’s the central hub for everything engine-related.
Symptoms of a Failing GM PCM
- ✔ Check Engine Light: The light may be on with various communication or sensor-related trouble codes (DTCs).
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector pulse or spark command from the PCM.
- ✔ Poor Performance & Fuel Economy: Your truck may feel sluggish, hesitate on acceleration, and use significantly more fuel than usual.
- ✔ Erratic Shifting: The transmission may shift harshly, slip between gears, or get stuck in one gear (limp mode).
- ✔ Engine Stalling: The engine may stall intermittently, especially when coming to a stop or at idle.
- ✔ Failed Emissions Test: A faulty PCM can prevent the vehicle’s readiness monitors from setting, leading to an automatic failure.
The Simple, Reliable Solution: A Programmed 1998-1999 GMC Yukon PCM
Replacing the PCM on these vehicles isn’t as simple as swapping a part. The module must be programmed with your vehicle’s specific Vehicle Identification Number (VIN) and equipped with the latest software updates from General Motors to function correctly. Our service eliminates the guesswork and the need for an expensive trip to the dealership. We handle the programming for you before the part ever leaves our facility.
Here’s how it works:
- Place Your Order: Purchase this PCM for your vehicle.
- Provide Your VIN: Reply to your order confirmation email or use the contact form to send us your 17-digit VIN.
- We Program It: Our technicians will flash the module with your vehicle’s specific VIN and the newest GM-certified calibration. This ensures perfect compatibility with your engine, transmission, and options.
- Install and Drive: Once you receive the PCM, simply disconnect your battery, swap the modules, and reconnect the battery. In most cases, you’re ready to go. Some vehicles may require a simple security relearn procedure, which can be done without special tools.
Guaranteed Compatibility
This genuine used OEM module, service number 16258815, is a direct replacement for a wide range of GM trucks and vans. It is fully compatible with modules bearing the hardware ID 09355699 or 9355699, and interchanges with part numbers 16266645, 16250279, 09366810, and 9366810. It fits dozens of models, including the Chevrolet Silverado, Express Van, Tahoe, Suburban, and the GMC Sierra, Savana Van, Yukon, as well as the Cadillac Escalade, Oldsmobile Bravada, and more from 1998-1999. Please verify the part number on your original module to ensure a perfect match.
Frequently Asked Questions
Do I need to get this computer programmed?
No. The main benefit of our service is that we program the computer for you. Simply provide us with your vehicle’s VIN after purchase, and we will flash it with the correct software before shipping. It will arrive ready to install.
Where is the PCM located on my 1999 GMC Yukon?
On most 1998-1999 GM full-size trucks and SUVs like the Yukon, Tahoe, and Suburban, the PCM is located in the engine compartment on the driver’s side, typically near the fender or firewall.
What is a security relearn or CASE relearn?
After installing the new PCM, your vehicle’s anti-theft system (PassLock/VATS) may need to be synchronized with the new module. This is a simple procedure that usually involves turning the key to the ‘ON’ position for 10-15 minutes. A CASE (Crankshaft Angle Sensor Error) relearn may also be needed to clear certain engine codes, which requires a capable scan tool, but the vehicle will still run and drive without it.
Is this a new part?
No, this is a thoroughly tested, genuine used OEM part sourced from a salvaged vehicle. We ensure each unit is fully functional before programming and shipping, offering you OEM reliability at a fraction of the cost.
What information do you need from me?
All we need is the 17-digit Vehicle Identification Number (VIN) from your vehicle. You can find this on your dashboard (visible through the windshield), on your driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.