Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Suburban 2500 suffering from frustrating issues like a persistent Check Engine Light, poor fuel mileage, erratic shifting, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. A faulty PCM can make your reliable truck feel unpredictable and unsafe. This isn’t just an inconvenience; it’s a critical component failure that needs a dependable solution.
This is a reliable, tested, and VIN-programmed PCM that serves as a direct-fit replacement. We take the biggest headache out of the repair process: programming. Simply provide us with your vehicle’s VIN after purchase, and our technicians will flash this module with the latest GM-certified software specific to your truck. This ensures that all engine and transmission parameters are perfectly calibrated, restoring the smooth operation and efficiency you expect from your vehicle. Don’t let a bad computer sideline your workhorse; get a reliable, ready-to-install solution.
A Technician’s Notebook
I remember a ’99 Tahoe that came into the shop with a ghost of a problem. The owner said it would randomly stall at red lights, but never threw a consistent code. We checked fuel pressure, spark, and sensors—all were fine. On a hunch, I connected a scope to the PCM’s 5-volt reference line. Sure enough, after 20 minutes of idling, we saw the voltage drop intermittently. The internal voltage regulator in the original PCM was failing under heat soak. Swapping in a quality, tested unit like this one solved the problem instantly. Sometimes, the issue isn’t what the codes tell you, but what the main computer isn’t doing correctly.
Is Your Truck Showing These Symptoms?
A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, your engine computer is a likely culprit:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, or P0606
- ✔ Vehicle refuses to start or has trouble starting
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Noticeable decrease in fuel economy
- ✔ Engine stalling, stuttering, or misfiring
- ✔ Failure to pass an emissions test
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle with basic tools. Our pre-programming service saves you a trip to the dealer. Here’s a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- 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. It’s a silver metal box with several large wiring harness connectors.
- Disconnect the Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. These connectors have locking tabs that may need to be gently pried or squeezed to release.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new PCM. You should hear a ‘click’ as they lock into place. Reconnect your battery’s negative terminal.
- Perform CASE Relearn: After installation, a Crankshaft Angle Sensor Error (CASE) relearn procedure may be required with a capable scan tool to prevent a P1336 code. This is a standard step for this generation of GM vehicles.
Verified Vehicle Compatibility
This module, identified by part number 9366810 or service ID 9355699, is a direct replacement for a wide range of GM vehicles. Please verify your part number or consult the list below to ensure a perfect match for your truck, van, or SUV.
- ✔ Chevrolet/GMC C/K 1500, 2500, 3500 Pickups (1998-1999)
- ✔ Chevrolet Suburban 1500 & 2500 (1998-1999)
- ✔ Chevrolet Tahoe & GMC Yukon (1998-1999)
- ✔ Cadillac Escalade (1999)
- ✔ Chevrolet Express & GMC Savana 1500, 2500, 3500 Vans (1998-1999)
- ✔ Chevrolet Astro & GMC Safari Vans (1998)
- ✔ Chevrolet S10, GMC Sonoma, & Isuzu Hombre (1998)
- ✔ Chevrolet Blazer, GMC Jimmy, & Oldsmobile Bravada (1998)
Frequently Asked Questions
Do I need to do any programming myself?
No. This PCM comes fully programmed to your vehicle’s specific VIN. We handle all the software flashing before it ships, so it’s ready for installation right out of the box.
What is a CASE Relearn and is it necessary?
A CASE (Crankshaft Angle Sensor Error) Relearn synchronizes the PCM with the crankshaft position sensor. While the truck will often run without it, performing this procedure with a compatible scan tool is highly recommended to ensure optimal timing and prevent a P1336 trouble code.
Is this a new part?
This is a high-quality, tested used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your vehicle’s 17-digit VIN. We cannot program and ship your order without it.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your shifting issues are caused by a faulty computer, this part is the correct fix.