Is Your GM Truck or Van Suddenly Unreliable?
If you’re behind the wheel of a classic 1998-1999 GM workhorse like a Suburban, Tahoe, or Express van, you know they’re built to last. But when the brain of the operationโthe Powertrain Control Module (PCM)โstarts to fail, it can cause some of the most frustrating and hard-to-diagnose problems. You might be experiencing intermittent stalling, a harsh or delayed transmission shift, a persistent check engine light, or even a no-start condition that leaves you stranded. You’ve checked the battery, the fuel pump, and the ignition system, but the problem remains. In my 20+ years as a diagnostician, I’ve seen this exact scenario hundreds of time. The culprit is often a failing PCM, where internal components have finally worn out from years of heat cycles and vibration.
The Direct-Fit, Programmed Solution for Your 1998-1999 Suburban 2500 PCM
Forget the guesswork and the high dealership costs. This is a genuine, road-tested used GM PCM that provides a reliable and affordable fix. The most critical part of the service is that we program it specifically to your vehicle’s VIN before it ships. This ensures all the factory settings for your engine, transmission, and options are loaded and ready to go.
- โ VIN Programmed & Updated: We flash the module with the latest GM software updates for your specific vehicle. This is a critical step that ensures optimal performance and compatibility.
- โ No Dealer Visit Needed: Because the unit arrives programmed, it’s a true plug-and-play installation. You save hundreds on dealer labor and programming fees.
- โ Solves Common Issues: Directly addresses symptoms like random stalling, no-start, communication error codes, and poor engine performance caused by a faulty computer.
- โ OEM Reliability: This is a tested, original equipment part, not a low-quality aftermarket alternative. It’s designed by GM for your GM truck.
Expert Pro Tip: Check Your Connectors!
Before you plug in your replacement PCM, take a moment to inspect the vehicle’s wiring harness connectors. Over two decades, it’s common for the plastic to become brittle and for the pins to develop a thin layer of green or white corrosion. Use a small pick and some quality electronics cleaner to gently clean each pin socket. A poor connection is the #1 reason a good module can act faulty upon installation.
Simple Installation to Get You Back on the Road
Installing your replacement 1998-1999 Suburban 2500 PCM is a straightforward job for any DIYer with basic tools. While locations vary slightly by model (e.g., LH engine compartment on trucks, LH rear on vans), the process is generally the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the existing module. It’s a metal box with several large multi-pin connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They often have locking tabs that need to be released. Then, unbolt the module from its bracket.
- Install the New Module: Bolt the new, programmed PCM into place and securely reconnect all wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal. The vehicle is now ready to start.
Guaranteed Compatibility
This module is a direct replacement for service number 9355699 and is interchangeable with several other part numbers, including 16266645, 16250279, 16258815, and 09366810. It fits a wide range of GM gasoline-powered vehicles from 1998-1999. Simply match your part number or provide your VIN, and we’ll handle the rest.