Is Your GM Truck or Van Running Rough?
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). In my 20+ years turning wrenches, I’ve seen hundreds of these late-90s GM trucks and vans sidelined by a faulty PCM. It’s the central computer, and when it starts to fail, it can cause a cascade of confusing symptoms that can be tough to diagnose.
The Brains of Your Engine: A Reliable, Programmed Solution
This isn’t just a used part; it’s a fully functional, tested PCM that we program specifically for your vehicle before it ever leaves our shop. Using the Vehicle Identification Number (VIN) you provide, we flash the module with the latest official GM software updates. This ensures your engine and transmission operate exactly as the manufacturer intended, often resolving drivability issues that were present even before the original computer completely failed. This is a direct-fit solution for your 1998-1999 Express 2500 PCM and many other GM models.
“A customer’s ’99 Suburban came in last week with an intermittent no-start and a U1000 loss of communication code that had other shops stumped. They had already replaced the battery and alternator. We identified a failing internal driver in the original PCM. After installing one of our pre-programmed units, the truck fired right up and has been running perfectly ever since. It’s a common failure point on these otherwise bulletproof vehicles.”
Why Choose Our Pre-Programmed PCM?
- ✔️ VIN-Specific Programming: We load the correct software and calibrations for your exact vehicle, ensuring seamless communication and performance.
- ✔️ Latest GM Updates: Your module arrives with the most current software, which can improve fuel economy, shift points, and idle quality.
- ✔️ Cost-Effective Repair: Get a reliable, tested OEM part without the high cost and hassle of a dealership visit.
- ✔️ Plug-and-Play Ready: Once programmed, this module is ready for installation. No additional flashing required.
Easy Installation Guide: Get Back on the Road
Installing your replacement PCM is a straightforward job for a DIYer with basic tools. Follow these steps carefully:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the PCM: On most of these trucks and vans, the PCM is a black box located in the engine compartment, typically on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors. Inspect the pins on both the harness and the old module for any corrosion or damage. Clean with electrical contact cleaner if necessary.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the electrical harnesses, ensuring they click securely into place.
- Reconnect the Battery: Attach the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, a simple 10-minute key-on/key-off security relearn procedure may be necessary. Your vehicle’s service manual will have the specific steps.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for units with service number 09355699. It is also fully interchangeable with the following part numbers: 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify the number on your original module to ensure compatibility. This part fits a wide range of 1998-1999 GM vehicles, including:
- Chevrolet Astro, Blazer, S10, Tahoe, Suburban & C/K/G-Series Trucks/Vans
- GMC Envoy, Jimmy, Safari, Sonoma, Yukon & C/K/G-Series Trucks/Vans
- Cadillac Escalade
- Oldsmobile Bravada
- Isuzu Hombre
After purchase, simply reply to your order confirmation email with your 17-digit VIN, and we’ll handle the programming. It’s the most reliable way to restore your vehicle’s performance and get you back on the road with confidence.