Is Your GM Van or Truck Running Rough? The PCM Might Be the Culprit.
If your 1998-1999 GMC Savana, Chevrolet Express, or another compatible GM vehicle is experiencing frustrating issues like stalling, poor fuel economy, erratic shifting, or a persistent Check Engine Light, the problem often lies with a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a wide range of performance problems that can be difficult to diagnose. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel efficiency, and overall safety.
The Smart Solution: A VIN-Programmed Replacement PCM
Don’t let a bad computer keep you off the road. This is a dependable, used OEM Powertrain Control Module (interchangeable with part numbers 09355699, 16266645, 9355699, 16250279, 16258815, and 9366810) that solves the problem without the exorbitant cost and hassle of a dealership visit. The critical difference with 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 (Vehicle Identification Number) during checkout, and we’ll flash the unit with the latest official GM software updates. This ensures that the computer is a perfect match for your vehicle’s specific configuration, making installation straightforward and effective.
From the Diagnostic Bay
We had a 1999 Chevy Suburban come in that the owner had spent a fortune on. He’d replaced the fuel pump, spark plugs, wires, and multiple sensors trying to chase down a random stalling and hard-start issue. No codes were consistently stored, making it a diagnostic nightmare. After checking all the basics, we hooked up a scope to the PCM outputs and found intermittent, erratic signals to the injectors. We swapped in one of our VIN-programmed PCMs, performed the quick security relearn, and the truck fired up instantly and ran smoother than it had in years. It’s a classic case where the ‘brain’ was the problem, not the parts it was controlling.
Symptoms of a Failing 1998-1999 Savana PCM
A failing PCM can manifest in numerous ways. If you’re noticing any of the following symptoms, it’s a strong indicator that your engine computer may need replacement:
- ✔ Check Engine Light: The light is on, and you may have codes related to sensors, emissions, or internal module failure.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly while driving or at idle, or you may feel random misfires.
- ✔ No-Start Condition: The engine cranks but refuses to start, even with a good battery and fuel supply.
- ✔ Poor Fuel Economy: A sudden and unexplained drop in your vehicle’s MPG can be caused by incorrect fuel and air mixture calculations from a faulty PCM.
- ✔ Harsh or Erratic Shifting: The PCM also controls transmission functions, and a failure can lead to hard shifts, delayed engagement, or getting stuck in a gear.
- ✔ Failed Emissions Test: Inability to pass a smog check is a common symptom of a malfunctioning engine computer.
Why Choose a Pre-Programmed Module?
This isn’t just a part; it’s a complete solution. This quality used module has been carefully inspected and tested to ensure functionality. By programming it to your VIN, we handle the most complex step for you. This means no need for expensive dealer-specific scan tools or paying for programming services after you receive the part. For many applications, after installation, you may only need to perform a simple security relearn procedure (often called a CASE relearn), which can typically be done without special tools. This gets your truck or van back to factory-specified performance quickly and affordably.
Frequently Asked Questions
What is a PCM?
The Powertrain Control Module (PCM), also known as an Electronic Control Module (ECM), is your vehicle’s main computer. It controls all aspects of engine performance, including fuel injection, ignition timing, emissions systems, and automatic transmission shifting.
Do I need to program this part?
No. We program the module for you before shipping. You must provide your vehicle’s 17-digit VIN when you place your order so we can load the correct GM software for your specific make, model, and options.
Where can I find my VIN?
Your VIN is located on a metal tag on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. This provides OEM reliability at a fraction of the cost of a new module.
What is a security or CASE relearn procedure?
After installing the new PCM, your vehicle’s anti-theft system may need to be synchronized with it. This is a simple procedure that often involves turning the key on and off in a specific sequence. A Crankshaft Variation (CASE) relearn may also be needed to prevent a misfire code, which requires a capable scan tool.