Get Your GM Truck Running Like New Again
Is your Chevrolet, GMC, or Cadillac truck or SUV suffering from baffling electrical gremlins, a persistent check engine light, or poor performance? A failing Powertrain Control Module (PCM) is often the culprit behind issues like stalling, rough idling, erratic shifting, and even a no-start condition. This genuine OEM engine computer, part number 16258815, is the definitive solution to restore your vehicle’s reliability and performance. We take the hassle out of the repair by programming the unit specifically to your vehicle’s VIN before it ships, ensuring a straightforward installation process.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty PCM is the likely cause. This pre-programmed module is designed to resolve these exact problems:
- Persistent Check Engine Light (CEL)
- Engine diagnostic codes such as P0601, P0605, or other internal module faults
- Vehicle won’t start or stalls intermittently
- Poor fuel economy and engine performance
- Harsh or failed transmission shifting
- Communication errors with diagnostic scan tools
By replacing your old module with this expertly programmed 16258815 PCM, you are installing a reliable, cost-effective fix that gets you back on the road with confidence.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: This PCM arrives flashed with the latest GM software updates tailored to your specific vehicle. This critical step ensures proper communication with all vehicle systems and eliminates the need for an expensive trip to the dealership.
- ✔ Restored Engine Performance: A correctly functioning engine computer is essential for managing fuel delivery, ignition timing, and transmission shifts. Expect a smoother idle, better throttle response, and improved fuel efficiency.
- ✔ Genuine OEM Reliability: Sourced from a salvaged vehicle, this is an original equipment manufacturer part, not a low-quality aftermarket alternative. It guarantees the same fit, form, and function as the unit your vehicle was built with.
- ✔ Direct-Fit Replacement: Designed to replace a wide range of original part numbers, including 09355699 and 16266645, this module bolts right into the factory location for a simple swap.
- ✔ One-Year Replacement Coverage: This unit is backed by our one-year replacement warranty, giving you peace of mind with your purchase.
Expert Insight: The GM Passlock Security System
Many DIY mechanics run into a frustrating no-start condition after swapping a PCM on these late-90s GM trucks due to the Passlock anti-theft system. Because our programmed 16258815 PCM is matched to your VIN, it simplifies this process immensely. While a quick security relearn procedure (often just a sequence of key turns) may still be necessary, our programming handles the heavy lifting, preventing the common headaches and towing bills associated with an improperly configured computer.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will use this to load the correct, updated software onto the PCM before we ship it to you. This ensures it works perfectly with your truck’s specific configuration.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is straightforward. It typically involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it from its bracket, and then installing the new one in reverse order. In most cases, it’s a true plug-and-play solution.
Will I need to do anything after installation?
Because this programmed 16258815 PCM is already flashed for your vehicle, no further dealer programming is needed. Some vehicles may require a simple security relearn procedure, which can be done without any special tools and takes about 30 minutes. Instructions for this procedure are widely available online.
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. PCM (Powertrain Control Module) is the most accurate term for this part, as it controls both the engine and transmission functions. ECM (Engine Control Module) and ECU (Electronic Control Unit) are more general terms. This part is the main computer for your vehicle’s engine and powertrain.
How can I be sure this fits my vehicle?
This PCM is a direct replacement for service number 16258815 and interchange ID 9355699, among others. Please review the detailed fitment list provided on this page. As long as your vehicle’s year, make, model, and engine are listed, this module is the correct part for you.
What is the warranty on this part?
This unit is backed by our one-year replacement warranty. This provides coverage against defects for a full year from the date of purchase.