Is Your GM Truck or Van Running Out of Ideas?
If your trusty 1998-1999 GM truck, van, or SUV is suffering from baffling issues like a persistent check engine light, erratic shifting, a no-start condition, or rough running, the problem might be its electronic brain. The Powertrain Control Module (PCM) is the master controller for your engine and transmission. When it fails, it can create a cascade of frustrating problems that are difficult to diagnose. This isn’t just an inconvenience; it’s downtime for your workhorse. Get back to reliability with this direct-fit, professionally programmed engine computer.
Common Failure Symptoms & Your Direct Solution
A failing PCM can mimic many other mechanical problems. Before you start replacing expensive sensors or transmission components, see if your vehicle is exhibiting these classic signs of a bad computer:
- Check Engine Light: Especially with communication error codes (U-codes) or internal module failure codes (P0601, P0605).
- No-Start or Intermittent Stalling: The engine cranks but won’t fire up, or it dies unexpectedly while driving.
- Poor Performance & Fuel Economy: A noticeable loss of power, hesitation, or a sudden drop in MPG.
- Harsh or Failed Shifting: The transmission may shift hard, get stuck in a gear (limp mode), or not shift at all.
This Programmed 16266645 PCM is the definitive solution. We take a quality, road-tested used module and flash it with the latest official GM software calibrated specifically to your vehicle’s VIN. This ensures all systems communicate correctly, restoring the performance and dependability you rely on.
Features & Real-World Benefits
- ✔ VIN-Specific Programming: We flash the module with your vehicle’s exact VIN before shipping. This means it arrives ready for a straightforward installation, saving you a costly trip to the dealership for programming.
- ✔ Updated GM Software: Your computer is loaded with the newest software updates from General Motors, which often correct factory bugs and improve engine and transmission performance.
- ✔ Cost-Effective Repair: Get the functionality of a new module without the steep dealership price tag. This is a smart, budget-friendly solution to get your vehicle back in service.
- ✔ Broad Compatibility: This unit is a direct replacement for a wide range of part numbers, including 09355699, 16250279, and 16258815, ensuring you get the correct part for the job.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty. You can install it with confidence, knowing you’re covered.
Expert Insight from a 20-Year Tech
I’ve spent countless hours diagnosing these GMT400-era GM vehicles. Their ‘black box’ PCMs are notoriously tough, but when they fail, they can cause some of the most confusing symptoms. I’ve seen trucks that wouldn’t shift out of first gear and vans that stalled randomly, all traced back to the PCM. The key isn’t just swapping the box; it’s ensuring the replacement has the right, updated software for your specific engine, transmission, and options. That’s the critical step we handle for you, turning a potentially complex electronic repair into a simple bolt-in job.
The Smart Choice for Your GM Truck or Van
Don’t let a faulty computer keep your vehicle off the road. By providing us with your VIN at checkout, you’re getting more than just a part; you’re getting a fully prepared, plug-and-play solution. This Programmed 16266645 PCM is the fastest and most reliable way to solve your vehicle’s electronic issues and restore its core function.
Frequently Asked Questions
What information do you need from me?
After your purchase, we require your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct, vehicle-specific software onto the computer before we ship it.
Will I need to do anything after installation?
In most cases, this is a plug-and-play installation. However, some GM vehicles of this era may require a simple security relearn procedure (often called a CASE relearn or Passlock relearn) to sync the new computer with your vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions are widely available online.
How can I be sure my old PCM is the problem?
While the symptoms listed are very common for PCM failure, it’s always best to have a proper diagnosis performed. This includes checking all power and ground connections to the computer and ruling out sensor or wiring issues. A failed PCM is a common issue on these vehicles, but a thorough diagnosis ensures you’re replacing the right part.
What does ‘used’ condition mean for this part?
This computer was sourced from a salvaged vehicle. Each unit is inspected and tested to ensure it is fully functional before being programmed and shipped to you. It’s a reliable and economical alternative to a brand-new part.
My original part has a different number, will this work?
Yes. GM often used several part numbers for the same computer. As long as your original part number is in our cross-reference list (including 09355699, 16250279, 9355699, etc.), this unit will function as a direct replacement once programmed for your vehicle.
What is the warranty on this computer?
This unit is backed by our one-year replacement warranty, giving you confidence and protection for your repair.