Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet, GMC, or Isuzu truck suffering from mysterious and frustrating issues? An illuminated Check Engine Light, poor fuel mileage, erratic shifting, or even a no-start condition can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points. When it begins to fail, the symptoms can be widespread and difficult to diagnose. This replacement PCM, service number 09355699, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe come into the shop with a complaint of harsh, unpredictable transmission shifts and a persistent check engine light. The owner had already replaced the transmission fluid and filter, and even a shift solenoid, with no improvement. Our scan tool pulled codes pointing to intermittent communication loss with the PCM. After checking the wiring harness and connectors, we suspected the computer itself. We installed a VIN-programmed PCM just like this one, performed the security relearn, and the truck drove like it just rolled off the assembly line. It’s a classic case where the symptoms in one system (the transmission) are actually caused by a failure in another (the engine computer).
Is Your Truck’s Brain Failing? Common Symptoms of a Bad PCM
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer may need replacement:
- ✔ Persistent Check Engine Light: The light stays on, often with communication-related trouble codes (like U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Engine Performance Problems: This includes rough idling, stalling, hesitation during acceleration, misfires, or a noticeable drop in power.
- ✔ Poor Fuel Economy: A faulty PCM can’t properly manage the air-fuel mixture, leading to a significant decrease in your MPG.
- ✔ Erratic Automatic Transmission Shifting: The PCM controls transmission behavior, so a failing unit can cause harsh shifts, delayed shifting, or getting stuck in one gear.
- ✔ No-Start or Intermittent Starting: The vehicle may crank but refuse to start, or it may start unreliably. This can happen when the PCM fails to control the fuel pump or ignition coils correctly.
- ✔ Failed Emissions Test: An improperly functioning PCM will almost certainly cause your vehicle to fail a smog or emissions inspection.
Why Choose Our GM Truck PCM 09355699?
This isn’t just a part in a box; it’s a complete, ready-to-install solution. We take a high-quality, tested, genuine OEM computer and professionally program it with the latest GM-certified software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This critical step ensures that the module communicates perfectly with all other systems in your truck, from the engine and transmission to the anti-lock brakes and instrument cluster. By purchasing a pre-programmed module, you avoid costly trips to the dealership for programming and complex setup procedures. It’s a cost-effective, plug-and-play repair.
This unit is a direct replacement for multiple part numbers, including 16258815, 09355699, 16266645, 9355699, 16250279, 09366810, and 9366810. It fits a wide array of popular GM models from 1998 and 1999, such as the Chevrolet Silverado, Suburban, Tahoe, Express Van, and the GMC Sierra, Yukon, Savana, as well as the Isuzu Hombre and more. Please verify the part number and consult the detailed fitment list to ensure perfect compatibility with your specific vehicle.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle the main programming by flashing the computer with your vehicle’s specific VIN and the latest software before it ships. In some cases, you may need to perform a simple security relearn procedure (also known as a CASE relearn), which can typically be done without special tools. Instructions are widely available online for this process.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a new part?
This is a genuine, used OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it meets strict quality standards. This provides the reliability of an original factory part at a fraction of the cost.
What happens if I don’t provide my VIN?
We cannot ship your order without a valid VIN. The programming is absolutely essential for the PCM to function in your truck. Any delay in providing the VIN will delay the shipment of your part.
Will this fix my check engine light?
If your check engine light and other symptoms are caused by a faulty PCM, this part is the correct solution. However, it’s crucial to ensure the vehicle has been properly diagnosed. This part will not fix issues related to other failed sensors or mechanical problems.