Is your 1998 or 1999 Chevrolet Suburban, Tahoe, or GMC Yukon running rough, stalling, or showing a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission performance. A faulty PCM can lead to a cascade of frustrating issues, from poor fuel economy to a complete no-start condition. This replacement PCM, part number 16258815, is the reliable, cost-effective solution to restore your truck’s original performance and dependability.
This isn’t just a part in a box; it’s a complete solution. We take a tested, functional PCM from a salvaged vehicle and professionally program it to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates perfectly with your truck’s existing systems, including the engine, transmission, and anti-theft security. By flashing it with the latest GM software updates, we ensure you’re getting the most refined operating parameters available, often correcting factory-known issues and improving overall drivability.
From the Diagnostic Bay
I once had a ’99 Tahoe in the shop that was a real head-scratcher. The owner had replaced the fuel pump, spark plugs, and even the distributor, but it still had a random, intermittent stall and a harsh 1-2 transmission shift. The check engine light would come on with a generic communication error code and then disappear. After hours of chasing wires, we finally hooked up a scope to the PCM outputs. We found that the injector driver circuit inside the original PCM was occasionally dropping out under heat. We installed one of these VIN-programmed modules, performed the security relearn, and the truck ran like it just rolled off the assembly line. It’s a reminder that sometimes the most complex problems come from a single, central component.
Symptoms of a Failing 1998-1999 Suburban PCM
If the main computer in your truck is failing, it can manifest in numerous ways. You might be experiencing one or more of the following issues. Look out for these common symptoms:
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling or cutting out unexpectedly
- ✔ Rough or erratic idling
- ✔ Harsh or incorrect transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ The engine cranks but refuses to start
- ✔ Failure to pass an emissions test
- ✔ Communication errors with diagnostic scan tools
The Right Part, Programmed and Ready
Don’t risk installing a generic, unprogrammed module from a junkyard. Modern vehicles require precise software to function correctly. Our process eliminates the guesswork and the expensive trip to a dealership for programming. Simply provide us with your VIN during checkout, and we handle the rest. The module you receive will be ready for installation, designed to be a direct-fit replacement for your original unit. This part is a direct replacement for multiple service numbers, including 09355699, 16266645, 9355699, 16250279, 09366810, and 9366810, and fits a wide range of GM trucks and vans from that era, such as the Chevrolet Express, GMC Savana, Cadillac Escalade, and C/K pickups.
Installation is straightforward for a DIY mechanic. After disconnecting the battery, you’ll locate the original PCM in the engine compartment, unbolt it, and disconnect the wiring harnesses. Simply connect the harnesses to your new module, bolt it in place, and reconnect the battery. In many cases, a simple security relearn procedure is all that’s needed to get you back on the road.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. This PCM comes fully programmed to your vehicle’s VIN with the latest GM updates before it is shipped. It is ready for installation right out of the box.
Is this a new part?
This is a high-quality, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure full functionality before being programmed and shipped.
What is a security relearn or CASE relearn?
A security relearn syncs the new PCM with your vehicle’s anti-theft system, allowing it to start. A CASE (Crankshaft Angle Sensor Error) relearn helps the PCM compensate for tiny variations in the crankshaft position sensor for a smoother idle. You may need to perform one or both of these simple procedures after installation.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found 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.
What happens if I forget to provide my VIN?
We cannot ship your order without a VIN. Programming is essential for the part to function in your vehicle. We will contact you to obtain the VIN before we can process and ship your PCM.
Will this PCM fit other vehicles besides the Suburban?
Yes, this module is compatible with a wide range of 1998-1999 GM trucks and vans, including the Tahoe, Yukon, Escalade, C/K Pickups, and Express/Savana vans. The crucial step is providing your VIN so we can ensure the correct software is loaded for your specific make, model, and options.