Get Your Workhorse Back on the Road Fast
Is your trusty 1998 or 1999 Chevy 3500 suddenly stalling, shifting erratically, or refusing to start? Are you battling a persistent Check Engine Light that points to a faulty computer? The Powertrain Control Module (PCM) is the brain of your truck’s engine and transmission, and when it fails, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just an inconvenience; it’s downtime for a truck that needs to work as hard as you do. Instead of spending a fortune at the dealership, get this reliable, VIN-programmed replacement PCM and restore your truck’s performance yourself.
The Direct Solution for Common PCM Failures
Over two decades in the shop, I’ve seen countless GM trucks from this era with puzzling electronic issues. A customer’s ’99 Silverado 3500 came in last week with these exact symptoms—it would crank but not start intermittently, especially after it had been running for a while. We checked the fuel pressure, spark, and all the usual suspects, but everything tested fine. The culprit was a failing injector driver circuit inside the original PCM that would only act up when it got hot. Replacing the module solved the problem instantly. This is a common failure point, and this replacement unit is the definitive fix.
Why Choose Our Pre-Programmed PCM?
- ✔ VIN-Specific Programming: We flash this module with the latest GM-approved software using your truck’s VIN. This ensures perfect communication with all other systems, just like the original.
- ✔ Solves Running Issues: Corrects problems like rough idle, poor fuel economy, hard starting, and erratic transmission behavior linked to a faulty computer.
- ✔ Plug-and-Play Installation: No need for a dealer visit or expensive scan tools for programming. It arrives ready to be installed right out of the box.
- ✔ Cost-Effective Repair: Get a fully functional, tested used module for a fraction of the price of a new one.
Simple DIY Installation for Your 1998-1999 Chevrolet 3500 PCM
You don’t need to be a master mechanic to swap this part. With basic hand tools, you can have your truck running right in under an hour. Follow these simple steps:
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the PCM: On most ’98-’99 Chevy/GMC trucks, the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. It’s a silver metal box with several large electrical connectors.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. They are often color-coded to prevent mix-ups.
- Remove the Old Module: Unbolt the mounting bracket holding the PCM in place and remove the old unit from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM in the same location, reconnect the electrical harnesses securely, and re-bolt the bracket.
- Reconnect Battery: Re-attach the negative battery terminal. Your truck is now ready to start.
Guaranteed Fitment and Compatibility
This Electronic Control Module is a direct replacement for a wide range of GM vehicles. To ensure a perfect match, please verify that your original module has one of the following part numbers. This unit is compatible with all of them:
Part Numbers: 09366810, 9366810, 09355699, 16266645, 9355699, 16250279, 16258815
While this listing is for the Chevrolet 3500, this module is also the correct computer for dozens of other 1998-1999 GM models, including the Suburban, Tahoe, Yukon, Express/Savana vans, S10/Blazer, and more, as long as the part number matches.
Expert Pro Tip: Ensure a Clean Connection
Before plugging the harnesses into your new PCM, take a moment to inspect the connector pins on the vehicle side. Use a small brush and some electrical contact cleaner to remove any dirt, oil, or corrosion. A poor connection is one of the most common causes of persistent electronic issues, and this simple step ensures your new module has a perfect link to your truck’s systems.