Restore Peak Performance to Your GM Truck or Van
Is your 1998 or 1999 GM vehicle running rough, stalling, or displaying a persistent check engine light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine’s performance, fuel economy, and emissions. A faulty PCM can lead to a cascade of frustrating issues, from poor acceleration and harsh shifting to a complete no-start condition. This genuine used OEM PCM, part number 9355699, is the reliable and cost-effective solution to get your truck back on the road and running like it should.
The Plug-and-Play Solution: Programmed to Your VIN
Don’t waste time and money at the dealership with expensive new parts and programming fees. We take the guesswork out of the repair. When you purchase this module, we will flash it with the latest official GM software updates specifically for your vehicle’s Vehicle Identification Number (VIN). This ensures that all factory parameters for your engine, transmission, and options are perfectly matched. The result is a simple, direct-fit replacement that is ready to install right out of the box, restoring factory performance and reliability.
From the Diagnostic Bay
We had a ’99 Suburban come in that the owner had thrown hundreds of dollars at. He’d replaced the crank sensor, cam sensor, and even the fuel pump, but it still had an intermittent stalling problem and a random misfire code. After checking all the wiring, we hooked up our scanner and saw erratic data coming from the PCM. We swapped in a VIN-programmed module just like this one, performed the quick security relearn, and the truck ran perfectly. The original PCM had failing internal drivers, a common issue on these older units. It’s a reminder that sometimes the root cause is the brain, not the sensors it’s reading.
Diagnosing a Faulty 1998-1999 Chevy 1500 PCM
A failing engine computer can mimic many other component failures. If you’re experiencing any of the following symptoms, your PCM could be the culprit. Cross-referencing these issues with diagnostic trouble codes (DTCs) related to computer failure or sensor circuits can help confirm your diagnosis.
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or cutting out intermittently
- ✔ Rough idling or poor engine performance
- ✔ A noticeable drop in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Complete no-start condition where the engine cranks but won’t fire
- ✔ Communication errors with diagnostic scan tools
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for service number 09355699 and is interchangeable with several other part numbers, including 16266645, 16250279, and 16258815. It fits a wide range of popular 1998-1999 GM trucks, vans, and SUVs like the Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Yukon, Express, Savana, and more. Please verify your original part number and consult the detailed fitment list to ensure perfect compatibility. Installation is straightforward: disconnect the battery, unplug the electrical connectors from your old PCM, unbolt it from the bracket, and install the new one in its place. After installation, a simple security relearn procedure (often called a Passlock relearn) may be required, which can typically be done without special tools.
Frequently Asked Questions
Do I need to program this PCM?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle.
What is a security relearn or CASE relearn?
A security relearn syncs the new PCM with your vehicle’s anti-theft system. A CASE (Crankshaft Angle Sensor Error) relearn calibrates the new computer to the specific position of your crankshaft sensor. On many of these vehicles, a security relearn is necessary to start the engine, and a CASE relearn is needed to turn off the check engine light. A qualified mechanic with a bi-directional scan tool can perform the CASE relearn.
Is this a new part?
This is a high-quality, tested, genuine OEM part sourced from a salvaged vehicle. We ensure it is fully functional before programming and shipping it to you. This provides OEM reliability at a fraction of the cost of a new unit.
How do I find my original part number?
Your PCM is typically located in the engine bay, often on the driver’s side fender or near the battery. The part number is printed on a sticker on the module’s case. It will be a large 8-digit number, such as 09355699.
Will this fix my vehicle’s problem?
This module will correct issues directly caused by a faulty PCM. While the symptoms listed are common for PCM failure, they can also be caused by other issues. We recommend a proper diagnosis by a qualified technician to confirm the PCM is the point of failure before ordering.