Is Your GMC Truck Running Rough?
If your 1998 or 1999 GMC 3500 is experiencing issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, a failing Powertrain Control Module (PCM) could be the culprit. The PCM is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a wide range of frustrating and difficult-to-diagnose problems. Don’t let a faulty computer keep your reliable truck off the road.
The Direct-Fit Solution for Your Vehicle
This is a genuine, used OEM Powertrain Control Module that offers a reliable and cost-effective solution. We take the guesswork and hassle out of the replacement process. Before shipping, we program the unit specifically to your truck’s Vehicle Identification Number (VIN). This ensures that the computer has the latest GM software updates and is perfectly matched to your vehicle’s specific configuration, making for a straightforward installation. You get a part that is ready to install right out of the box, with no need for an expensive trip to the dealership for programming.
Symptoms of a Failing 1998-1999 GMC 3500 PCM
- ✔ Check Engine Light is on with various communication or sensor codes.
- ✔ Engine stalls, misfires, or runs poorly for no apparent reason.
- ✔ The transmission shifts harshly, erratically, or not at all.
- ✔ A noticeable drop in fuel economy.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication issues with diagnostic scan tools.
This module is a direct replacement for several part numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. It fits a wide range of GM trucks and vans from that era, but this listing is specifically for the 1998-1999 GMC 3500 PCM. Please provide your VIN upon purchase so we can ensure perfect compatibility and programming for your truck.
Frequently Asked Questions
Do I need to have this computer programmed?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software for your specific truck.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be in good working condition before being programmed and shipped.
Where is the PCM located on my 1999 GMC 3500?
On most 1998-1999 GM full-size trucks, the Electronic Control Module (PCM) is located in the engine compartment, typically on the driver’s side inner fender or near the firewall.
Will this fix my check engine light?
If the check engine light and associated codes are being caused by a faulty PCM, then this replacement part should resolve the issue. However, it’s important to properly diagnose the vehicle, as the light could be on for other reasons like a bad sensor or wiring issue.
What is a VIN and where can I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.