Restore Peak Performance to Your GM Truck or SUV
As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can bring an otherwise solid truck to its knees. If your 1998-1999 Suburban, Tahoe, or GM pickup is suffering from a persistent check engine light, erratic shifting, stalling, or a frustrating no-start condition, the PCM is often the culprit. This isn’t just a part; it’s the brain of your vehicle’s operation, and when it falters, everything from fuel economy to engine timing is compromised. This replacement PCM, part number 16250279, is the definitive solution to get your reliable GM vehicle back on the road and running strong.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store or a junkyard pull that requires an expensive trip to the dealership, this unit arrives at your door pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest GM-certified software updates, ensuring optimal communication between your engine and transmission. This process corrects many factory bugs and improves overall drivability, giving your truck a new lease on life.
A Technician’s Notebook: The Intermittent Stall Mystery
I remember a 1999 GMC Sierra 2500 that came into my bay with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 20 minutes. There were no consistent trouble codes, just a history of random communication errors. After checking fuel pressure and ignition components, which all tested fine, I focused on the PCM. On these older GM trucks, I’ve seen the internal driver circuits for the ignition control module or fuel injectors weaken over time due to heat cycles. The fault was so intermittent that it was nearly impossible to catch in the act. Swapping in a pre-programmed 1999 Suburban 1500 PCM (the same family of modules) solved the problem instantly. The customer called a week later, ecstatic that his truck was finally dependable again. That’s the kind of fix this part delivers.
Is Your GM Truck Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs replacement:
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault)
- ✔ Vehicle refuses to start or has intermittent starting issues
- ✔ Poor or erratic automatic transmission shifting
- ✔ A significant drop in fuel economy
- ✔ Engine stalling, stumbling, or running rough for no apparent reason
- ✔ Failure to pass an emissions/smog test
DIY Installation: A Straightforward Guide
Replacing the PCM on these GM trucks is a job most DIYers can handle in their own driveway. Our pre-programming service eliminates the most difficult step. Here’s a basic guide to get you started:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the PCM: On most compatible models (like the Suburban, Tahoe, and pickups), the PCM is located in the engine bay on the driver’s side, near the firewall or inner fender.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors. These have locking tabs, so be gentle to avoid damaging them. There are typically three or four large connectors.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module into the bracket and securely re-fasten the bolts.
- Reconnect Everything: Firmly plug the wiring harness connectors back into the new PCM until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn: After installation, you will likely need to perform a simple security relearn procedure (often called a CASE relearn). This can usually be done without special tools and involves a sequence of turning the key. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct-fit replacement for service numbers 16250279, 09366810, and 09355699. It is guaranteed to fit the following gasoline-engine models, provided your original module carries a matching ID number:
- Cadillac Escalade: 1999
- Chevrolet/GMC Pickups (1500/2500/3500): 1998-1999
- Chevrolet/GMC Suburban (1500/2500): 1998-1999
- 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
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada: 1998
- GMC Envoy: 1998
- Isuzu Hombre (4.3L): 1998
Please verify the part number on your current module to ensure a perfect match. Providing your VIN upon purchase is mandatory for us to program the unit correctly for your vehicle’s specific configuration.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. While the main engine and transmission programming is done, you will need to perform a security relearn procedure, often called a CASE (Crankshaft Angle Sensor Error) relearn. This synchronizes the new PCM with your vehicle’s anti-theft and crankshaft position systems. This procedure typically takes about 30 minutes and can be done without special tools.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
Is this a brand new part?
This is a high-quality, fully tested replacement module. Each unit undergoes rigorous inspection and validation to ensure it meets or exceeds OEM specifications for performance and reliability before being programmed with the latest GM software.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids that manage shifting in the automatic transmission. If your transmission issues are electronic in nature (caused by the computer), this module is the correct fix. It will not fix internal mechanical failures like worn clutches.
What if my part number is slightly different?
This module is a direct replacement for part numbers 16250279, 09366810, and 09355699. If your module has a different number, please contact us first to ensure compatibility. We want to make sure you get the right part the first time.