Is Your GM Truck or Van Running Rough?
If your 1998-1999 GMC Savana, Chevrolet Express, or another compatible GM vehicle is experiencing perplexing issues like random stalling, no-start conditions, erratic shifting, or a persistent Check Engine Light, the culprit is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission control. When it begins to fail, it can create a cascade of problems that are frustrating and difficult to diagnose. This genuine, used OEM engine computer, part number 16250279, is the reliable and cost-effective solution to restore your vehicle’s performance and dependability.
From the Diagnostic Bay
We had a ’99 Chevy Tahoe come into the shop that was driving the owner crazy. It would run fine for days, then suddenly refuse to start. Other times, it would stall at a stoplight and then fire right back up. The owner had already replaced the fuel pump and ignition coil with no luck. After running diagnostics, we found intermittent communication loss with the PCM. We swapped in one of these VIN-programmed modules, performed the security relearn, and the Tahoe ran perfectly. It wasn’t a mechanical part failing; it was the brain itself glitching. This is a classic symptom for these vehicles, and a correctly programmed replacement PCM is the definitive fix.
Symptoms of a Failing 1998-1999 Savana PCM
A failing PCM can manifest in various ways. If you’re noticing any of the following issues, it’s a strong indicator that your engine computer needs replacement. Look out for:
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication errors (U-codes) or multiple, unrelated sensor failures.
- ✔ No-Start or Intermittent Start: The engine cranks but won’t start, or it only starts sporadically. This can be caused by the PCM failing to command fuel or spark.
- ✔ Poor Engine Performance: Noticeable decrease in power, rough idling, hesitation during acceleration, or a significant drop in fuel economy.
- ✔ Harsh or Erratic Shifting: The transmission may shift hard, get stuck in a gear, or shift at the wrong times, as the PCM also controls transmission functions.
- ✔ Stalling: The engine may die unexpectedly while driving or when coming to a stop.
- ✔ Failure to Communicate: Your diagnostic scan tool is unable to connect with the PCM, preventing you from reading codes.
Plug-and-Play Solution with VIN Programming
Don’t settle for a generic computer from a salvage yard that won’t work with your vehicle. This module is not just a part; it’s a complete solution. We take a genuine, tested OEM computer and flash it with the latest official GM software updates specifically for your vehicle. All you need to do is provide us with your Vehicle Identification Number (VIN) after purchase. This critical step ensures that the PCM is correctly configured for your vehicle’s specific engine, transmission, and options, making installation as simple as possible. This process eliminates the need for expensive trips to the dealership for programming.
This unit is a direct replacement for multiple part numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Please verify that your original module carries one of these numbers to ensure compatibility.
Please Note: After installing the new PCM, you will likely need to perform a security relearn procedure (often called a VATS or Passlock relearn). This procedure syncs the new computer with your vehicle’s anti-theft system and can typically be done without special tools. Instructions for this process are widely available online or in service manuals for your specific model.
Frequently Asked Questions
Do I need to send my old computer in?
No, there is no core charge or need to send your original module to us. This is a direct purchase.
What is VIN programming?
VIN programming involves loading your vehicle’s specific software and calibration files onto the PCM using your 17-digit Vehicle Identification Number. This ensures the computer works correctly with your engine, transmission, and factory options.
Is this part difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery and swapping the module. However, you MUST perform a security relearn procedure afterward for the vehicle to start. This procedure varies by model but usually involves a sequence of key turns.
Will this fix my vehicle’s problem for sure?
While this PCM replacement resolves the common issues listed, it’s essential to have your vehicle properly diagnosed. This part will fix the problem if the original PCM is indeed the faulty component.
Where do I provide my VIN?
After you complete your purchase, please send us a message with your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information for programming.