Restore Peak Performance to Your GM Truck or Van
Is your reliable 1998-1999 Suburban 2500 suddenly giving you headaches? If you’re dealing with frustrating issues like stalling, erratic shifting, a persistent Check Engine Light, or a no-start condition that has you stumped, the culprit is often the Powertrain Control Module (PCM). As the electronic brain of your vehicle, the PCM controls everything from fuel mixture and spark timing to transmission shift points. When it fails, it can cause a wide range of problems that can sideline even the toughest of trucks.
This isn’t just another part pulled from a shelf. This is a dependable, fully tested used OEM PCM that we program specifically for your vehicle using your VIN. We flash it with the latest official GM software updates, ensuring all factory improvements for drivability and performance are loaded and ready to go. This critical programming step means you get a module that communicates perfectly with your truck’s systems right out of the box, saving you from expensive dealership programming fees and complex diagnostic headaches. Get the reliability you depend on back with a solution designed for a perfect fit and function.
A Technician’s Notebook: The No-Start That Wasn’t the Fuel Pump
A few months back, a 1999 Chevy K2500 was towed into my bay. The owner was at his wit’s end. He’d replaced the fuel pump—twice—but the truck would only crank, never fire. He was convinced it was a wiring issue. After checking for power at the pump, I found it was dead. But instead of tracing wires for hours, I went straight to the source: the PCM. On these GMT400 trucks, a common failure point inside the PCM is the driver that controls the fuel pump relay. A quick test confirmed my suspicion. We installed one of our VIN-programmed PCMs, and the truck fired up on the first turn. It’s a classic example of how a failing computer can mimic a mechanical problem, and why having a properly functioning PCM is non-negotiable.
Is Your GM Truck Showing These Signs?
- ✔ No-start or intermittent starting issues
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Unexplained drop in fuel economy
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Check Engine Light on with PCM-related Diagnostic Trouble Codes (DTCs) like P0601, P0602, P0605, or P0606
- ✔ Failure to communicate with a diagnostic scan tool
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- ✔ Locate the PCM: On most compatible trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- ✔ Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the old module. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it for the new installation.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into the correct ports on your new module. You will hear a click when they are properly seated. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn (If Necessary): In many cases, you will need to perform a security relearn procedure (often called a CASE learn) to sync the new PCM with your vehicle’s anti-theft system. This simple procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.
With this pre-programmed 1998-1999 Suburban 2500 PCM, you are getting a cost-effective and reliable fix. It eliminates the guesswork and provides a direct path to resolving complex electronic issues, making it an ideal choice for both professional mechanics and savvy DIYers.
Verified Compatibility for Your GM Vehicle
This module, identified by service number 9355699, is a direct replacement for a wide range of GM vehicles. Please verify your part number or match your vehicle from the list below to ensure proper fitment.
- ✔ Cadillac Escalade: 1999
- ✔ Chevrolet/GMC Pickups (1500, 2500, 3500): 1998-1999 (Gasoline)
- ✔ Chevrolet/GMC Suburban (1500, 2500): 1998-1999 (Gasoline)
- ✔ Chevrolet Tahoe / GMC Yukon: 1998-1999 (Gasoline)
- ✔ Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999 (Gasoline)
- ✔ Chevrolet Astro / GMC Safari: 1998
- ✔ Chevrolet S10 / GMC Sonoma: 1998 (4.3L)
- ✔ Chevrolet Blazer / GMC Jimmy: 1998 (4.3L)
- ✔ Oldsmobile Bravada: 1998
- ✔ GMC Envoy: 1998
- ✔ Isuzu Hombre: 1998 (4.3L)
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. We will flash the module with the latest GM software updates using the VIN you provide, so it arrives ready for installation.
How do I provide my VIN?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically add it as a note during checkout or send it to us in a message referencing your order number.
Is this a new part?
This is a high-quality, tested used OEM computer that has been sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
What is a CASE Relearn and will I need to do one?
A Crankshaft Variation Relearn (CASE Relearn) may be required to sync the new PCM with your engine’s crankshaft position sensor. This prevents a P1336 trouble code. While not always necessary after a swap, it can often be performed with a capable scan tool. Many vehicles will operate fine without it, but for optimal performance, we recommend it.
Will this PCM fit other part numbers?
Yes, this module is a direct replacement for several part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. As long as your vehicle is on the compatibility list, this module will function correctly.