Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, stalling, or a no-start condition in your 1998 or 1999 GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine, the PCM controls critical functions like fuel mixture, ignition timing, and transmission shifting. When it fails, it can cause a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and emissions. Don’t let a faulty computer keep you off the road. This replacement module is the reliable, cost-effective solution to restore your vehicle’s performance and peace of mind.
From the Diagnostic Bay
I once had a 1999 Chevy Suburban in the shop that was driving the owner crazy. He had replaced the spark plugs, wires, cap, rotor, and even the fuel pump trying to solve an intermittent stalling and hard-starting issue. The check engine light would come on and off with random codes. After checking all the basics, I hooked up my professional scan tool and noticed the PCM was intermittently losing communication. The internal processor was failing. We installed one of these VIN-programmed modules, performed the security relearn, and the truck ran like it just rolled off the factory floor. It’s a classic case of symptoms pointing everywhere, but the root cause being the vehicle’s brain.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) with various or no specific codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Rough or erratic idling and poor engine performance.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass an emissions test.
- ✔ Scan tool cannot communicate with the PCM.
Why Choose Our Programmed GM PCM 09355699?
Getting the right part is only half the battle; it needs to be correctly configured for your specific vehicle. This isn’t a generic, off-the-shelf part. We take the guesswork out of the repair by programming this module specifically for your truck or van using the Vehicle Identification Number (VIN) you provide. This critical step ensures that the computer has the correct software and calibrations for your engine, transmission, and factory options. We flash it with the latest available updates from General Motors, which can often correct underlying drivability issues that were present even when the vehicle was new. This is a genuine, used OEM part sourced from a salvaged vehicle, providing factory reliability without the dealership price tag.
This GM PCM 09355699 is a direct replacement for a wide range of popular trucks and vans, including the Chevrolet Silverado, Express, Tahoe, Suburban, GMC Sierra, Savana, Yukon, and Isuzu Hombre. Please verify your original part number or consult our detailed fitment list to ensure compatibility. Upon installation, you may need to perform a simple security relearn procedure (often called Passlock or Passkey relearn), which can typically be done in your driveway without special tools. This procedure syncs the new module with your vehicle’s anti-theft system.
Frequently Asked Questions
What information do you need from me after I order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot ship your part until we have this information, as we use it to program the module specifically for your vehicle.
Is this part ready to install out of the box?
Yes, it comes programmed to your VIN. However, on many GM vehicles of this era, you will need to perform a security relearn procedure after installation. This is a simple process that typically involves turning the key on and off in a specific sequence and takes about 30 minutes. Instructions are widely available online for your specific model.
How can I be sure my PCM is the problem?
The symptoms listed above are strong indicators of a failing PCM. However, we always recommend a proper diagnosis by a qualified mechanic. Issues like bad wiring, faulty grounds, or failed sensors can sometimes mimic PCM failure. A professional diagnosis can save you time and money.
Is this a new part?
No, this is a thoroughly tested, used OEM computer that was carefully recovered from a salvaged vehicle. This allows us to provide a reliable, factory-spec part at a significant saving compared to a new unit from a dealer.
What part numbers does this module replace?
This module, service number 09366810, is a direct replacement for several part numbers, including the very common ID 09355699, as well as 16266645, 9355699, 16250279, and 16258815. Please check the list on this page to confirm fitment for your vehicle.