Get Your Truck Running Right Again
Is your trusty GM truck or van suddenly running rough, stalling, or refusing to start? A faulty Powertrain Control Module (PCM) is a common cause for these frustrating issues, leaving you stranded and questioning your vehicle’s reliability. This professionally programmed engine computer is the straightforward, dependable solution to restore your vehicle’s performance and get you back on the road with confidence. It’s the critical brain of your engine, and we ensure it’s ready to work for you right out of the box.
Common Symptoms & Your Direct Solution
A failing PCM can cause a wide range of problems that can be difficult to diagnose. If you’re experiencing any of the following, this module is your likely solution:
- Persistent Check Engine Light (CEL)
- Engine stalling or misfiring (e.g., DTC P0300-P0308)
- Harsh or erratic automatic transmission shifting
- Complete no-start condition
- Poor fuel economy
- Communication errors with diagnostic scan tools
This replacement unit directly addresses these failures. We take a reliable, tested OEM module and flash it with the latest official GM software calibrated specifically to your vehicle’s VIN. This process ensures that all engine, transmission, and emissions parameters are set correctly, just like the original. When it comes to a vital component like the 1999 GMC 1500 PCM 16266645, proper programming is the key to a lasting repair.
Features & Benefits
- ✔ Ready to Install: This module arrives pre-programmed to your vehicle’s specific VIN. No expensive trips to the dealer for programming are necessary.
- ✔ Updated GM Software: We flash the unit with the newest updates from General Motors, ensuring optimal engine performance, fuel efficiency, and transmission function.
- ✔ Cost-Effective Solution: Get the reliability of an OEM part without the steep dealership price tag. This is a smart, economical repair for your work truck or family SUV.
- ✔ Broad Compatibility: A direct replacement for multiple service numbers including 16266645, 09355699, 16250279, and more, guaranteeing a perfect fit for a wide range of GM vehicles.
- ✔ Guaranteed Performance: This unit is backed by our one-year replacement warranty.
Expert Insight: The Importance of VIN Programming
On these late-90s GM trucks, the PCM is tied into the Passlock anti-theft system. Simply swapping a module from another vehicle won’t work—the truck won’t start. Our VIN-specific programming correctly pairs this 1999 GMC 1500 PCM 16266645 to your truck’s systems *before* it ships. This eliminates the most common failure point of a DIY module replacement and saves you from hours of troubleshooting and potential towing bills. While a simple security relearn procedure (instructions included) may be needed, our core programming does all the heavy lifting for you.
Frequently Asked Questions
What information do you need from me after I order?
We need your 17-digit Vehicle Identification Number (VIN) to program the module correctly. Please provide it during checkout or send it to us in a message immediately after your purchase to avoid shipping delays.
Is this a new computer?
No, this is a thoroughly tested, used OEM computer sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped.
Will I need to do any additional programming myself?
No additional programming is required. The module arrives ready to be installed. However, you may need to perform a simple security relearn procedure, which takes about 30 minutes and does not require any special tools. We can provide instructions for this process.
How can I be sure my PCM is the actual problem?
Common symptoms include a no-start condition, erratic shifting, and multiple engine codes. However, these issues can also be caused by bad wiring or faulty sensors. We always recommend having your vehicle professionally diagnosed before ordering to confirm the PCM is the point of failure.
Is this part difficult to install?
On most of these GM trucks and vans, the PCM is located in the engine bay and is held in place by a few bolts and electrical connectors. Installation is typically straightforward for someone with basic mechanical skills. Always remember to disconnect the battery before beginning the replacement.