Is Your 1998-1999 GM Truck or Van Running Rough?
If your Chevrolet Suburban, Tahoe, Express Van, or GMC Yukon is experiencing perplexing issues like stalling, erratic shifting, a persistent check engine light, or a complete no-start condition, the culprit is often the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM manages everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, it can create a cascade of problems that are frustrating and difficult to diagnose.
The Direct Solution for Your Vehicle’s Brain
Don’t let a faulty computer keep your reliable GM truck off the road. This is a genuine, used OEM Powertrain Control Module, service number 16266645 (interchangeable with 09355699 and others), that serves as a direct-fit replacement. The most significant advantage of our service is that we program the module specifically for your vehicle before it ever leaves our facility. Simply provide us with your vehicle’s VIN at checkout, and we will flash the unit with the latest official GM software updates. This ensures optimal performance and compatibility, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay
We had a ’99 Tahoe come in on a tow truck. The owner had replaced the fuel pump, crank sensor, and ignition coil, but it still wouldn’t start—it had spark and fuel pressure, but the injectors weren’t firing. After hours of chasing wires, we connected a scanner and saw no communication with the PCM. We swapped in one of our pre-programmed modules, performed the security relearn, and the engine fired up on the first crank. A faulty PCM can mimic many other failures, making it a tricky diagnosis. A known-good, correctly programmed module is often the fastest path to a solution.
Diagnosing a Failing 1998-1999 Suburban PCM
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following symptoms, a faulty engine computer could be the root cause. This module is the correct solution for these common issues.
- ✔ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- ✔ Engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Unexplained stalling or stumbling while driving.
- ✔ Significant decrease in fuel economy.
- ✔ Misfires or rough idling that can’t be traced to plugs, wires, or coils.
- ✔ Failure to pass an emissions test.
Plug-and-Play Convenience
This isn’t just a part; it’s a comprehensive solution. Because we handle the programming, the installation process is simplified. Once installed, you will likely need to perform a simple security relearn procedure (often called a Passlock or VATS relearn), which can typically be done in your driveway without special tools. This procedure syncs the new computer with your vehicle’s anti-theft system. This module is a reliable and cost-effective alternative to sourcing a new part from a dealership.
This unit has been carefully removed from a salvaged vehicle and inspected for quality. It is compatible with a wide range of 1998-1999 GM trucks, vans, and SUVs. Please verify your part number (16266645 or an equivalent like 09355699) and consult the detailed fitment list to ensure this is the correct component for your specific make, model, and engine.
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. While we program the module to your VIN, you will need to perform a security relearn procedure. This syncs the computer to your vehicle’s anti-theft system. This procedure can usually be done without special tools and instructions are widely available online for your specific model.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is specific to your vehicle.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. This allows us to provide a reliable, factory-spec component at a fraction of the cost of a new one.
Will this fix my vehicle’s problem?
This PCM will resolve issues directly caused by a faulty engine computer. While the symptoms listed are common for PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the root cause of your problem before ordering.
What if my part number is slightly different?
This module, 16266645, is interchangeable with several other part numbers, including 09355699, 9355699, 16250279, and more. Please check the list in our description. If your number is on that list, this part will work for you.