Restore Your Truck’s Performance and Reliability
Is your 1998-1999 GMC Yukon or other GM truck running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic symptoms of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can create a cascade of frustrating problems, from poor fuel mileage and erratic shifting to a complete no-start condition. Don’t let a bad module keep your reliable truck off the road. This replacement 1998-1999 Yukon PCM is the definitive solution to get your engine and transmission working in harmony again.
As a technician with over two decades of experience, I’ve seen firsthand how a failing computer can mimic a dozen other mechanical problems. Before you start replacing sensors and other expensive parts, consider the core of the system. This module, part number 09355699, is a direct-fit replacement that eliminates guesswork. The best part? We handle the programming for you. Simply provide your vehicle’s VIN at checkout, and we’ll flash the module with the latest GM factory software specific to your truck. This ensures perfect communication between all systems and restores original performance characteristics right out of the box.
From the Diagnostic Bay: The Ghost in the Machine
I remember a ’99 Suburban that came into my shop a few years back. The owner was at his wit’s end. He’d been to two other places for an intermittent stalling issue and harsh 1-2 shift. No one could find the problem because it wouldn’t act up consistently. We hooked up the scan tool and saw some strange data dropouts from the PCM, but no hard codes. On a hunch, I gently tapped on the PCM housing with a screwdriver handle while the engine was running—and it stalled immediately. The internal circuit boards had developed micro-fractures from years of heat and vibration. We installed a VIN-programmed module just like this one, and the truck ran perfectly. It’s often these ‘ghost’ issues that trace back to a failing computer.
Common Signs of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Engine stalling or stumbling for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A sudden, unexplained drop in fuel economy.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- ✔ Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. These connectors have locking tabs that need to be released.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module until they click securely in place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn (If Necessary): In some cases, a simple 10-15 minute security relearn procedure may be required. This typically involves turning the key to the ‘ON’ position for 10 minutes, then off, and repeating two more times before starting the vehicle.
Will This Fit My GM Vehicle?
This module is a confirmed fit for a wide range of GM vehicles. Please verify your part number (16250279, 09366810, or 09355699) and check the list below. This is the correct part for the following models:
- Cadillac Escalade: 1999
- Chevrolet/GMC Pickups (1500, 2500, 3500): 1998-1999 (Gasoline engines)
- Chevrolet/GMC Suburban (1500, 2500): 1998-1999 (Gasoline engines)
- Chevrolet Tahoe / GMC Yukon: 1998-1999
- Chevrolet Astro / GMC Safari: 1998-1999
- Chevrolet Express / GMC Savana (1500, 2500, 3500): 1998
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L)
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre: 1998 (4.3L)
Frequently Asked Questions about this 1998-1999 Yukon PCM
Do I need to get this module programmed?
No. We program the module for you before shipping. Just provide your vehicle’s 17-digit VIN during or after checkout, and it will arrive ready to install with the latest GM software for your specific vehicle.
Where do I find my VIN?
Your VIN can be found on a metal tag on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a plug-and-play part?
Yes, for over 95% of vehicles, it is. Once programmed to your VIN, you simply install it. A small number of vehicles may require a simple security relearn procedure, which does not require any special tools.
Will this fix my transmission shifting problems?
If the shifting issues are caused by faulty electronic commands from a failing PCM, then yes, this will resolve them. The PCM controls shift points and line pressure, so a healthy module is critical for proper transmission function.
What part numbers does this replace?
This module is a direct replacement for service numbers 16250279, 09366810, and 09355699.