Is Your Late-90s GM Truck or Van Giving You Headaches?
If you’re dealing with frustrating issues like a no-start condition, erratic engine performance, harsh shifting, or a check engine light that won’t go away, the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hoods of these exact vehicles, I’ve seen it all. A customer’s ’99 Suburban came into my shop last week with these exact symptoms. He’d already replaced the fuel pump and multiple sensors, chasing a ghost. A quick scan showed no communication with the PCM. The culprit? A failed driver circuit inside the module, a common issue I’ve seen on hundreds of these Vortec-era trucks and vans.
This isn’t just a replacement part; it’s a direct solution. We are offering a reliable, used OEM PCM that is fully tested and then programmed specifically to your vehicle’s Vehicle Identification Number (VIN). This ensures all factory settings and operational parameters are perfectly matched to your truck’s engine, transmission, and options.
The Right Fix for Common GMT400 & Express Van Problems
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a faulty computer is a very likely cause:
- โ Engine cranks but refuses to start.
- โ Stalling, rough idling, or poor fuel economy.
- โ Automatic transmission shifting erratically or not at all.
- โ Unexplained diagnostic trouble codes (DTCs) for multiple sensors.
- โ No communication with your scan tool.
- โ Check Engine Light is on with no clear mechanical cause.
Why Our VIN-Programmed 1998-1999 Chevrolet 2500 PCM is the Smart Choice
Forget the hassle and high cost of a dealership visit. We handle the complex programming for you. Simply provide your VIN after purchase, and we’ll flash the module with the latest GM-certified software updates. This process corrects many of the original factory drivability issues and ensures optimal performance. This module is a genuine, salvaged OEM part, meaning it was designed by GM for your vehicle, ensuring perfect fitment and communication with other onboard systems.
Expert Pro Tip: Before you install your new PCM, take five minutes to inspect and clean the main electrical connector and its pins. On these ’90s trucks, corrosion from moisture and heat can build up, causing poor contact. A simple cleaning with a small wire brush and contact cleaner can prevent a whole host of issues that often get misdiagnosed as a bad module. A solid connection is critical for the PCM to function correctly.
Plug-and-Play Installation: No Dealer Visit Required
Getting your truck back on the road is straightforward. While professional installation is always recommended, this is a job a confident DIYer can handle. The module is typically located in the engine bay for easy access.
- Safety First: Disconnect the negative battery terminal and wait at least 15 minutes for the system capacitors to discharge.
- Locate the PCM: On most 1998-1999 Chevrolet 2500 trucks, the PCM is located on the driver’s side of the engine compartment, near the fender or firewall.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. Inspect them for any damage or corrosion.
- Swap the Modules: Unbolt the old PCM from its mounting bracket and install the new one in its place.
- Reconnect and Finalize: Securely plug the electrical harnesses into your new, pre-programmed PCM. Reconnect the negative battery terminal. In some cases, a security relearn procedure may be necessary, which can typically be done without special tools.
Guaranteed Compatibility
This Electronic Control Module is a direct replacement for service number 09366810 and is also a compatible replacement for several other part numbers, including 09355699, 16266645, 16250279, and 16258815. It fits a wide range of 1998-1999 GM trucks, SUVs, and vans. Please verify your part number or consult the detailed fitment list to ensure this is the correct part for your vehicle.