Restore Peak Performance to Your GM Workhorse
Is your 1998-1999 GMC Savana 3500 Van or compatible GM truck suffering from erratic behavior, poor fuel economy, or a persistent check engine light? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. This vital component manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This listing offers a direct, reliable solution: a genuine used OEM PCM, part number 09366810, professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN).
The Brain of Your Engine: Why a Healthy PCM Matters
The PCM in your late-90s GM vehicle is a sophisticated computer that constantly analyzes data from sensors throughout the engine and drivetrain. It uses this information to make real-time adjustments, ensuring your engine runs efficiently, smoothly, and within emissions standards. A failing module can misinterpret sensor data or fail to send correct commands, leading to symptoms that can mimic a bad sensor, a faulty transmission, or a fuel system problem. Replacing a faulty PCM is critical to restoring your vehicle’s reliability and drivability.
From the Diagnostic Bay
We had a 1999 Chevy Express 2500 come in with what the owner was sure was a failing transmission. It was shifting hard, sometimes getting stuck in gear, and the check engine light was on. He had already replaced the vehicle speed sensor and was about to spend thousands on a transmission rebuild. After hooking up our professional scan tool, we noticed erratic data PIDs and communication dropouts from the PCM. The transmission itself was mechanically sound; it was just receiving bad commands from a failing computer. We installed a VIN-programmed PCM like this one, performed the security relearn procedure, and the van drove like new. It saved the customer a massive headache and an unnecessary, expensive repair.
Common Symptoms of a Failing 1998-1999 Savana 3500 PCM
- ✔ Check Engine Light: The most common indicator, often with codes related to internal module failure, sensor circuits, or communication errors (U-codes).
- ✔ No-Start or Hard-Start Condition: The PCM controls the fuel pump and ignition coils. If it fails to command them, the engine won’t start.
- ✔ Poor Engine Performance: You may experience rough idling, stalling, hesitation, or a significant loss of power as the PCM struggles to manage the engine.
- ✔ Reduced Fuel Economy: Incorrect fuel mixture and timing calculations from a faulty module can cause your vehicle to consume more fuel than usual.
- ✔ Erratic Transmission Shifting: The PCM works with the transmission controller. A failing PCM can cause harsh shifts, delayed shifting, or getting stuck in a single gear.
- ✔ Intermittent Issues: Problems that come and go with temperature changes or vehicle vibration often point to failing internal connections within the PCM.
Plug-and-Play Solution with VIN Programming
Don’t settle for a generic, unprogrammed module from a junkyard. This used PCM is sourced from a salvaged vehicle and is tested for functionality. The critical difference is our professional programming service. Before we ship your part, we flash it with the latest official GM software updates and program it specifically to your vehicle’s VIN. This ensures compatibility with your vehicle’s specific options, engine, and transmission. This process makes installation as simple as possible, though a security relearn procedure (often called a CASE relearn or anti-theft relearn) may be required after installation.
Guaranteed Fitment for a Wide Range of GM Vehicles
This Electronic Control Module, identified by service number 09366810 or interchange part number 09355699, is a direct replacement for a vast array of GM trucks and vans from the 1998-1999 model years. Please verify your part number and check the extensive compatibility list below to ensure this is the correct part for your vehicle.
This module is compatible with the following part numbers: 09355699, 16266645, 16250279, 16258815, 09366810, 9366810.
Frequently Asked Questions
Do I need to do anything after I purchase?
Yes. After your purchase is complete, you MUST send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. Please double-check your VIN for accuracy before sending.
Is this a new part?
No, this is a used, genuine OEM part that has been sourced from a salvaged vehicle. It has been inspected and is ready for programming and installation.
Will I need to have this programmed by a dealer?
No. We handle the programming for you before shipment. It will arrive flashed with the latest GM software and coded to your specific VIN, making it ready for installation.
What other steps are needed after installation?
In many cases, you will need to perform a security relearn procedure, also known as an anti-theft relearn. This procedure pairs the new PCM to your vehicle’s ignition key and can typically be done without special tools. Instructions can be readily found online for your specific model.
How do I find my original part number?
Your original part number is printed on a sticker on the PCM itself. The module is typically located in the engine bay, often on the driver’s side fender or near the battery.