Is Your GM Truck or Van Running Rough?
If your 1998-1999 Suburban 2500 is experiencing frustrating issues like a persistent check engine light, poor fuel mileage, stalling, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As a mechanic with over two decades of experience under the hood of these exact trucks, I’ve seen how a faulty PCM can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. This isn’t just a computer; it’s the operational brain of your vehicle, and when it fails, your reliable workhorse is sidelined.
The Smart, Simple Solution: A VIN-Programmed PCM
Forget expensive dealership visits and the hassle of finding a shop that can program a replacement module. We offer a reliable, tested, and ready-to-install solution. This is a genuine used GM PCM, part number 16266645, pulled from a salvaged vehicle and meticulously inspected. The real value is in our service: we flash the module with the latest official GM software updates, specifically programmed to your vehicle’s unique VIN. This ensures seamless communication and proper function right out of the box.
Real-World Diagnostic Story
“A customer’s 1999 GMC Yukon came in last week on a tow truck. It would crank but never start. He had already replaced the fuel pump and filter, convinced it was a fuel delivery issue. After checking for spark and fuel pressure (which was present), I hooked up my scan tool. The PCM wasn’t commanding the fuel injectors to fire. We swapped in one of our pre-programmed modules, and the engine fired up on the first try. It wasn’t a bad fuel pump; the original PCM’s injector driver circuit had failedโa classic issue I’ve diagnosed on hundreds of these GM trucks.”
Symptoms of a Failing PCM This Part Can Fix:
- โ Persistent and unexplained Check Engine Light (CEL)
- โ Vehicle refuses to start or has hard starting issues
- โ Rough or erratic engine idle
- โ Poor acceleration and loss of power
- โ Decreased fuel economy
- โ Harsh or incorrect automatic transmission shifting
- โ Communication errors with diagnostic scan tools
Easy Installation for Your 1998-1999 Suburban 2500 PCM
You don’t need to be a master technician to install this module. With basic hand tools, you can get your truck back on the road. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. Inspect the terminals for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Re-attach the negative battery terminal. The vehicle is now ready to start. No further programming is required.
Guaranteed Compatibility
This PCM is a direct replacement for several part numbers. Please verify that your original module has one of the following numbers printed on its label to ensure a perfect match: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, or 9366810. It is compatible with a wide range of 1998-1999 GM gasoline-powered trucks, SUVs, and vans. After purchase, simply provide us with your VIN, and we’ll handle the rest.