Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 Suburban, Tahoe, Yukon, or Express van running poorly? Experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or even a no-start condition? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. This vital component manages everything from fuel delivery and ignition timing to transmission shift points. When it fails, the symptoms can be widespread and difficult to diagnose. This replacement PCM, part number 9355699, is the reliable solution to get your truck back on the road and running smoothly.
From the Diagnostic Bay
I once had a ’99 Chevy K2500 in the shop that was driving the owner crazy. It would run fine for 20 minutes, then suddenly die and refuse to restart for an hour. No check engine light, no obvious cause. We checked fuel pressure, spark, and all the usual suspects. On a hunch, I connected the scan tool and monitored live data. Just as it stalled, I saw all communication with the PCM drop. The module was failing internally when it reached operating temperature. We installed a VIN-programmed replacement like this one, and the truck ran perfectly. It’s a classic failure mode for these older modules, and a direct replacement is the only correct fix.
Is Your Vehicle Showing Signs of a Failing PCM?
A faulty PCM can manifest in numerous ways. If you’re noticing any of the following symptoms, it’s a strong indication that your engine computer needs replacement. This 1998-1999 Suburban PCM is engineered to resolve these exact problems.
- ✔ Check Engine Light: The light is on, and you may have codes related to module communication (U-codes) or multiple, unrelated sensor faults.
- ✔ No-Start or Hard Starting: The engine cranks but won’t start, or starts only after extended cranking, especially when warm.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, or rough idling.
- ✔ Reduced Fuel Economy: Your truck is suddenly using more fuel than usual without any change in driving habits.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, at the wrong times, or seem to get stuck in one gear.
- ✔ Failed Emissions Test: A malfunctioning PCM can prevent the vehicle’s emissions systems from operating correctly, leading to a failed test.
Plug-and-Play Solution: Programmed to Your VIN
Don’t waste time and money at the dealership. We take the complexity out of the repair. This is not just a part in a box; it’s a complete solution. When you place your order, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most up-to-date GM factory software specific to your truck’s exact build. This critical step ensures that the PCM communicates perfectly with your engine, transmission, and all other onboard systems. The result is a simple, plug-and-play installation with no need for additional programming.
This quality used OEM module is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. It has been carefully sourced and inspected to ensure reliability. By choosing this part, you’re getting an original factory component that meets GM’s specifications for a fraction of the cost of a new one.
Installation Note
While installation is straightforward, it is crucial to disconnect the vehicle’s battery before removing the old PCM and installing the new one. After installation, some vehicles may require a Crankshaft Angle Sensor Error (CASE) relearn procedure to be performed with a compatible scan tool for optimal performance and to extinguish certain trouble codes. This is a standard procedure when replacing the PCM on these GM vehicles.
Frequently Asked Questions
Do I need to do any programming myself?
No. This PCM comes fully programmed to your vehicle’s VIN. It is ready to be installed right out of the box.
How do I provide my VIN?
After you complete your purchase, we will contact you to request your 17-digit Vehicle Identification Number (VIN). We cannot ship the part until we have programmed it.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM (Original Equipment Manufacturer) part sourced from a salvaged vehicle.
What is a CASE relearn and is it required?
A CASE relearn synchronizes the new PCM with your engine’s crankshaft position sensor. While many vehicles will run without it, performing the procedure with a capable scan tool is highly recommended for optimal engine timing, performance, and to prevent a P1336 trouble code.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If your shifting issues are caused by a faulty computer, this part will resolve them.
My original part number isn’t 9355699, will this work?
Please check the list of compatible part numbers in the description (e.g., 16266645, 16250279). This module is a direct replacement for all the part numbers listed.