Is Your GM Truck or Van Running Rough?
If your late-90s Chevrolet or GMC vehicle is experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points. When it fails, it can cause a wide range of perplexing problems that can be difficult to diagnose. Don’t let a faulty computer keep your reliable truck or van off the road. This is your direct-fit, VIN-programmed solution.
From the Diagnostic Bay
We had a ’99 Tahoe come in that the owner had thrown a ton of parts at. New sensors, plugs, wires… you name it. It had a random misfire code that would never pinpoint a specific cylinder, and it would intermittently refuse to shift out of first gear. After checking all the wiring, we hooked up our scanner and saw communication dropouts from the PCM. We swapped in a VIN-programmed module like this one, and the truck immediately ran like it just rolled off the assembly line. It’s often the last thing people suspect, but for these GMT400 and Express platform vehicles, a failing PCM is a very common issue.
Symptoms of a Failing PCM
- ✔ Check Engine Light is on with codes related to internal module failure (e.g., P0601, P0605).
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle refuses to start, even with a good battery and starter.
- ✔ Noticeable decrease in fuel economy.
- ✔ Failure to pass state emissions testing.
- ✔ Other modules on the vehicle’s data network are not communicating.
The Plug-and-Play Solution for Your 1998-1999 Express 1500 PCM
Forget expensive dealership visits and the hassle of finding a shop that can program older modules. We take the guesswork and complexity out of the repair. This is a genuine, used GM PCM that has been rigorously tested and is ready for service. The key to our solution is the pre-programming service. When you place your order, you provide us with your vehicle’s 17-digit VIN. Our technicians then use that VIN to flash the module with the latest, most up-to-date software calibration directly from GM. This ensures that the computer is perfectly matched to your vehicle’s specific engine, transmission, and options.
This process makes installation straightforward. In most cases, it’s as simple as disconnecting the battery, unplugging the old module, installing the new one, and reconnecting the battery. Because it arrives already programmed, you avoid the need for specialized scan tools or costly towing to a facility for programming. This module is a direct replacement for multiple part numbers, including 16266645 and 09355699, and fits a wide array of popular GM models from 1998-1999, such as the Chevrolet Silverado, Express, Tahoe, Suburban, and their GMC counterparts like the Sierra, Savana, and Yukon.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your original module to us. This is a direct purchase, which simplifies the process and gets you back on the road faster.
What is a VIN and why do you need it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. We use it to load the exact factory software and calibrations for your specific engine, transmission, and emissions equipment. This ensures perfect compatibility and performance.
Is any additional programming required after installation?
In most cases, no. This PCM comes fully programmed to your VIN. After installation, you may need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn), which is a simple process that can typically be done without special tools. Instructions can be readily found for your specific model.
Is this a new part?
This is a high-quality, tested used part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides a reliable and cost-effective alternative to sourcing a new, often discontinued, module.
How do I find my part number to ensure this is a match?
Your original PCM’s part number is printed on a sticker on the module itself. You can cross-reference it with the compatible part numbers listed: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. Matching one of these numbers guarantees a fit.