Is Your 1998-1999 GM Truck or Van Suddenly Unreliable?
If you’re dealing with a frustrating no-start condition, erratic engine behavior, random stalling, or a persistent Check Engine Light on your Chevrolet Express 3500 or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. Over two decades in the shop, I’ve seen hundreds of these specific ‘black box’ PCMs fail. The constant heat cycles and vibration in the engine bay eventually take their toll on the internal circuits, leading to symptoms that can be maddening to diagnose.
You might be experiencing issues like harsh shifting, poor fuel economy, or even a complete loss of communication with your scan tool. Don’t let a faulty computer keep your workhorse off the road. This is the reliable, straightforward solution you’ve been looking for.
The Plug-and-Play Solution: A Pre-Programmed PCM
This isn’t just a replacement part; it’s a complete service. We are offering a quality, tested, used OEM PCM that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This means:
- ✔ No Expensive Dealer Visit: We handle the programming, saving you hundreds of dollars and the hassle of getting your vehicle to a dealership.
- ✔ Latest GM Software: Your module arrives loaded with the newest factory software updates from General Motors, ensuring optimal performance and efficiency.
- ✔ Guaranteed Compatibility: By using your VIN, we ensure the module is a perfect match for your vehicle’s engine, transmission, and options.
- ✔ Restored Performance: A properly functioning PCM is critical for engine timing, fuel delivery, and transmission control. This part will restore your vehicle’s original power and drivability.
Expert Pro Tip from a 20-Year Technician: Before you install your new PCM, take a moment to inspect the harness connectors. Over the years, the pins can get a green, powdery corrosion on them, especially on work vans that see a lot of weather. Use a small brush and some quality electrical contact cleaner to gently clean both the male and female pins. A clean connection is just as important as a good module and can prevent a host of intermittent issues down the line.
Easy Installation for the DIYer or Professional
Replacing the PCM on these vehicles is a very manageable job. You can have your truck or van running right in your own driveway in under an hour. While a GM-specific security relearn procedure may be required after installation (a simple process you can find online), the physical swap is straightforward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, you’ll find the PCM in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Harnesses: Carefully release the locking levers or tabs on the large electrical connectors and pull them straight out from the module. Avoid wiggling them side-to-side.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Seat your new, pre-programmed PCM into the bracket, bolt it down, and firmly reconnect the electrical harnesses until they click into place.
- Power Up: Reconnect the negative battery terminal. Your vehicle is now ready for the key-cycle relearn procedure if needed.
Confirm Your Part Number
This module is a direct replacement for several part numbers. Please verify that your original module has one of the following numbers printed on the label: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, or 9366810. It fits a wide range of GM vehicles from 1998-1999, including many Chevrolet, GMC, Cadillac, and Isuzu models. Once you place your order, simply provide us with your VIN, and we’ll take care of the rest.