Restore Peak Performance to Your GM Vehicle
Is your 1998-1999 Chevrolet or GMC truck, van, or SUV suffering from mysterious engine problems? A faulty Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is frequently the culprit. As the central computer for your engine and transmission, its proper function is critical for everything from fuel economy to shifting. This genuine used GM PCM, part number 9355699, is the reliable and cost-effective solution to get your vehicle back on the road and running smoothly.
From the Diagnostic Bay
We once had a ’99 Chevy Suburban come in with a complaint of random stalling and a hard start condition. The owner had already replaced the fuel pump and ignition coil with no luck. Scans showed intermittent communication loss codes. Instead of chasing wires for hours, we checked the basics and then focused on the PCM. After swapping in a tested and correctly programmed module like this one, the Suburban fired up instantly and ran perfectly. It’s a reminder that the vehicle’s ‘brain’ can cause some of the most confusing symptoms.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine cranks but fails to start, or experiences very long crank times.
- ✔ Rough idling, stalling, or hesitation during acceleration.
- ✔ A sudden and unexplained drop in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions inspections due to module-related codes.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our Pre-Programmed PCM 9355699?
Don’t risk installing a generic, non-programmed module that won’t work with your vehicle’s specific systems. We take the guesswork and hassle out of the repair. This isn’t just a part in a box; it’s a complete solution. We use your vehicle’s Vehicle Identification Number (VIN) to flash the module with the latest, most up-to-date software directly from GM. This ensures that it communicates perfectly with your engine, transmission, and other onboard systems right out of the box. This PCM 9355699 arrives ready for a straightforward, plug-and-play installation, saving you a costly trip to the dealership for programming.
Simple, Hassle-Free Process
- ✔ Place Your Order: Complete your purchase for this module.
- ✔ Provide Your VIN: Reply to our confirmation email or send us a message with your 17-digit VIN.
- ✔ We Program It: Our technicians will flash the unit with the correct GM software for your exact vehicle.
- ✔ Install and Drive: Once you receive the module, simply disconnect your battery, swap the part, reconnect the battery, and you’re ready to go.
This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810. It fits a wide array of popular GM vehicles from 1998-1999, including the Savana, Express, Tahoe, Yukon, Suburban, C/K Pickups, and more. Please verify the part number and consult the detailed fitment list to ensure compatibility with your specific model and engine.
Frequently Asked Questions
Why do I need to provide my VIN?
Your VIN is essential for us to program the PCM with the exact software and calibrations for your vehicle’s engine, transmission, and options. This ensures seamless integration and proper function without needing a trip to the dealer.
Is this part difficult to install?
Installation is typically straightforward. It involves disconnecting the vehicle’s battery, unplugging the electrical connectors from the old PCM, unbolting it, and then installing the new one in reverse order. Most DIY mechanics can complete the job with basic hand tools.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part should resolve the issue. However, it’s always recommended to have your vehicle properly diagnosed to ensure the PCM is the root cause of the problem, as other failing sensors can also trigger a check engine light.
Is this a new or used part?
This is a high-quality, tested, and fully functional used part sourced from a salvaged vehicle. Each unit is inspected and then programmed to your specific VIN to ensure reliability and performance.
Do I need to perform a security relearn procedure?
For many GM vehicles of this era, a security relearn (often called a Passlock or VATS relearn) may be necessary after installation. This is a simple procedure that typically involves cycling the ignition key and can be done without special tools. Instructions are widely available online for your specific model.