Is your Chevrolet or GMC truck running rough, stalling unexpectedly, or showing 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. Don’t let a faulty computer keep your reliable truck or van off the road. This genuine used GM PCM, part number 09355699, is the dependable and cost-effective solution to restore your vehicle’s functionality and peace of mind.
The Brain of Your Engine, Restored
The PCM is the single most critical electronic component in your vehicle. It constantly analyzes data from dozens of sensors to control fuel injection, ignition timing, transmission shifting, and emissions systems. When it fails, the symptoms can range from mildly annoying to a complete no-start condition. Replacing it with a generic, unprogrammed unit from a local auto parts store often leads to more problems, as it lacks the specific software your vehicle requires. Our process ensures this unit is a true plug-and-play solution.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe come in that had its owner chasing his tail for weeks. The truck would randomly die at stoplights and had a terrible hesitation on acceleration. He had already replaced the fuel pump, ignition coil, and spark plugs based on forum advice. After plugging in our scanner, we saw erratic data from the PCM. We sourced a correct, used module, programmed it to the truck’s VIN, and installed it. The Tahoe immediately fired up and ran like it just rolled off the assembly line. It wasn’t a dozen small parts failing; it was the one part controlling them all. This is a story we see time and time again.
Why Choose Our VIN-Programmed GM PCM 09355699?
This isn’t just a used part pulled from a shelf. Each module undergoes a critical programming process before it ships. When you provide your vehicle’s Vehicle Identification Number (VIN), we flash the unit with the latest, most stable software updates directly from General Motors for your specific make, model, and engine configuration. This crucial step ensures that your vehicle operates exactly as the manufacturer intended, resolving software bugs from the original programming and optimizing performance and fuel economy. It’s a direct replacement for multiple part numbers, including 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810.
Common Symptoms of a Failing ECM
- ✔ Check Engine Light is on with various trouble codes.
- ✔ Engine stalling or shutting off while driving.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough idling or misfiring.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
Simple Installation Process
Once you receive your pre-programmed module, installation is straightforward for a DIY mechanic or any professional technician. Simply disconnect the negative battery terminal, locate your old PCM (typically in the engine bay), carefully unplug the wiring harnesses, unbolt the module, and swap in the new one. Reconnect the harnesses and the battery. In many cases, a security relearn procedure (often called a CASE relearn) may be required with a capable scan tool to sync the new computer with your vehicle’s anti-theft system and crankshaft position sensor. This is a standard final step for this type of repair.
Frequently Asked Questions
Do I need to do anything after I buy this PCM?
Yes. After you complete your purchase, you MUST send us your vehicle’s 17-digit VIN. We cannot ship the module until we have programmed it with your specific vehicle information.
Is this a new part?
No, this is a genuine, used OEM part that has been sourced from a salvaged vehicle. It has been tested for functionality and is ready to be programmed and installed in your vehicle.
Will this fix my vehicle’s problem for sure?
This part will correct issues directly caused by a faulty PCM. While the symptoms listed are very 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 the part number on my old module is slightly different?
This module, 09355699, is a direct replacement for several other part numbers, including 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. As long as your original part number is on this list, this module will fit and function correctly once programmed.
What is a security or CASE relearn?
A security relearn syncs the new computer with your vehicle’s anti-theft system. A CASE (Crankshaft Angle Sensor Error) relearn calibrates the new PCM to the specific signal from your crankshaft position sensor for accurate misfire detection. These procedures often require a professional-grade scan tool and are a common final step in PCM replacement.