Is Your Late 90s GM Truck or Van Acting Up?
If you’re dealing with a persistent check engine light, erratic transmission shifting, a no-start condition, or rough idling on your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer, it controls everything from fuel mixture and spark timing to transmission shift points. When it goes bad, the symptoms can be frustrating and difficult to diagnose. I’ve spent two decades under the hood of these trucks, and I’ve seen firsthand how a faulty PCM can bring an otherwise solid vehicle to a standstill.
The Smart, Simple Solution: A VIN-Programmed PCM
Forget expensive dealership visits and the hassle of finding a local shop with the right equipment. We offer a reliable, tested PCM that arrives at your door ready for installation. This isn’t just a generic part off a shelf; it’s a genuine used GM module that we meticulously program to your vehicle’s specific Vehicle Identification Number (VIN). This ensures all factory settings and operational parameters are perfectly matched to your truck’s engine, transmission, and options.
From the Shop Floor: “A customer’s ’99 Tahoe came in last week with what he was sure was a bad transmissionโharsh shifts and getting stuck in gear. He’d already replaced the solenoids. After a quick scan, I saw no specific transmission codes, but multiple communication errors pointing back to the computer. We swapped in a VIN-programmed PCM like this one, and the truck shifted perfectly. A failing PCM can often send you chasing expensive mechanical ‘ghosts’. It’s a critical check before condemning a major component.”
Why Choose Our 1998-1999 Chevrolet 1500 PCM?
- โ VIN-Programmed for You: We flash the module with the latest GM software updates using your specific VIN. This is crucial for proper function.
- โ Plug-and-Play Installation: No additional programming or dealer trips are required. Once installed, your vehicle will start and run correctly.
- โ Solves Common Issues: Effectively resolves problems like false sensor codes, poor fuel economy, hard starting, and erratic engine performance.
- โ Broad Compatibility: This module, identified by service number 9355699, is a direct replacement for part numbers 16266645, 16250279, 16258815, 09366810, and more, fitting a wide range of GM trucks and vans.
- โ Cost-Effective Repair: Get a dependable, programmed computer for a fraction of the cost of a new dealership part.
Easy Installation Guide
You can do this job with basic hand tools in your own driveway. Hereโs how:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes. This allows all onboard systems to fully power down.
- Locate the PCM: On most 1998-1999 GM full-size trucks and SUVs, the PCM is located in the engine compartment on the driver’s side, near the fender or firewall. It’s a black box with several large multi-pin connectors.
- Disconnect the Harnesses: Carefully unclip and remove all electrical connectors from the old PCM. Inspect the pins and connectors for any corrosion or damage. Clean them with electrical contact cleaner if necessary.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM into the bracket and securely re-fasten the bolts.
- Reconnect Everything: Firmly plug all electrical harnesses back into the new module. Ensure they click into place. Reconnect the negative battery terminal.
- Final Step: Your vehicle is now ready to start. The security system will automatically relearn the new PCM on its own, a process that may require you to cycle the key a few times as per your owner’s manual.
After purchase, simply send us a message with your 17-digit VIN, and we’ll handle the programming before shipping your part. It’s the most straightforward way to get your truck running right again.