Is Your Late 90s GM Truck Running Rough?
The Powertrain Control Module, or PCM, is the central computer of your 1998-1999 Chevrolet Tahoe, Suburban, or GMC Yukon. It’s the brain behind the entire operation, managing everything from the fuel injectors and ignition timing to the transmission shift points. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems that can be difficult to diagnose. You might experience a sudden drop in fuel economy, a check engine light that won’t go away, or even a no-start condition that leaves you stranded. Don’t let a faulty computer dictate your truck’s reliability. This genuine, used OEM PCM is your direct-fit solution.
From the Diagnostic Bay
I remember a ’99 Yukon that came in on a tow truck. The owner had spent a fortune replacing the fuel pump, crank sensor, and even the distributor, trying to solve an intermittent stalling and no-start issue. The codes were all over the place—communication errors, sensor circuit faults. After checking the main power and ground circuits to the computer, we hooked up a scope and saw the 5-volt reference signal dropping out intermittently. The original PCM was failing internally, taking the whole system down with it. We installed a VIN-programmed module just like this one, performed the security relearn, and it fired right up. The customer was thrilled to have his reliable truck back without throwing any more parts at it.
Common Symptoms of a Failing 1998-1999 Tahoe PCM
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Engine stalling or shutting off while driving
- ✔ Difficulty starting or a complete no-start condition
- ✔ Rough or erratic idling
- ✔ Poor acceleration and overall loss of power
- ✔ Decreased fuel efficiency
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Communication error codes with a diagnostic scan tool
The Plug-and-Play Solution for Your Truck
Replacing the PCM on these older GM trucks used to mean a trip to the dealership for expensive programming. We’ve eliminated that hassle. When you purchase this module, you simply provide us with your vehicle’s 17-digit VIN. Our technicians will then flash the unit with the latest, most up-to-date software directly from GM for your specific vehicle configuration. This ensures that all parameters for your engine, transmission, and emissions equipment are set correctly right out of the box. This isn’t just a replacement; it’s a restoration of your vehicle’s original operating logic.
Installation and Setup
This module is a direct physical replacement for part numbers 09366810, 09355699, 16266645, 16250279, and 16258815, among others. Installation is straightforward: disconnect the battery, unplug the old module’s wiring harnesses, unbolt it from its bracket (typically on the driver’s side inner fender), and install the new one. After reconnecting everything, you will likely need to perform a security relearn procedure, also known as a Passlock or VATS relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and can often be done without special tools. In some cases, a CASE (Crankshaft Angle Sensor Error) relearn may be required with a capable scan tool to ensure optimal engine timing and prevent misfire codes. This 1998-1999 Tahoe PCM is the definitive fix to get you back on the road with confidence.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your truck.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle. This ensures perfect fitment and compatibility.
What do I need to do after I install it?
After installation, you will need to perform a security relearn procedure to sync the PCM with your vehicle’s anti-theft system. This can typically be done without special tools and instructions are widely available online. A CASE relearn with a scan tool may also be necessary for optimal performance.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
My original part number is 09355699. Will this work?
Yes. This PCM, part number 09366810, is a direct replacement for several part numbers, including 09355699. Please check the full interchange list in the description to confirm compatibility with your vehicle.