Is Your GM Truck or SUV Experiencing Engine Problems?
If your 1999 Cadillac Escalade, Chevrolet Tahoe, GMC Yukon, or other compatible GM vehicle is suffering from erratic behavior, poor fuel economy, or a persistent check engine light, a failing Powertrain Control Module (PCM) could be the culprit. As the central computer, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it fails, the symptoms can be widespread and frustrating, often leaving your vehicle unreliable or completely inoperable.
From the Diagnostic Bay
We had a 1999 Suburban come into the shop that had its owner completely stumped. It would start and run fine for a few minutes, then suddenly stall and refuse to restart for an hour. The owner had replaced the fuel pump, crank sensor, and ignition coil, but the problem persisted. After hooking up our professional scan tool, we noticed the data stream from the PCM would just drop out right before the stall. All power and ground feeds to the computer were solid. We swapped in a programmed PCM, performed the security relearn, and the truck ran perfectly. It was a classic case of internal PCM failure due to heat and age, a common issue on these GMT400 platforms.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various trouble codes (DTCs).
- ✔ Vehicle fails to start or stalls intermittently.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Rough idling, engine misfires, or hesitation during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions tests.
- ✔ Communication errors with diagnostic scan tools.
The Direct-Fit Solution: A VIN-Programmed 1999 Escalade PCM
Don’t let a faulty computer keep your classic GM truck off the road. This is a genuine, road-tested used OEM Powertrain Control Module, part number 9355699, that serves as a direct replacement for a wide range of 1998 and 1999 GM trucks and vans. The most significant benefit of our service is that we program the module specifically for your vehicle using the VIN you provide. This critical step ensures that the computer has the correct software and calibrations for your engine, transmission, and specific options, eliminating the need for an expensive trip to a dealership for programming.
This unit is flashed with the latest available updates from General Motors, which can resolve factory-known bugs and improve overall vehicle performance and reliability. By matching the software to your VIN, we ensure a seamless installation process. In most cases, after the physical installation, you will only need to perform a simple security relearn procedure, which can be done without any special tools.
Guaranteed Compatibility
This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810. It fits a vast array of vehicles, including but not limited to:
- 1999 Cadillac Escalade
- 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups
- 1998-1999 Chevrolet Suburban & Tahoe
- 1998-1999 GMC Yukon & Suburban
- 1998-1999 Chevrolet Express & GMC Savana Vans
- 1998 Chevrolet S10 Blazer, GMC S15 Jimmy, Oldsmobile Bravada
Please verify that your original module carries one of the compatible part numbers to ensure a perfect fit for your application.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls the engine and transmission functions by reading data from various sensors and making real-time adjustments to fuel delivery, spark timing, and shift points to ensure optimal performance, fuel economy, and emissions.
Do I need to do anything after I install this computer?
Yes. While we program the module to your VIN, you will likely need to perform a security relearn procedure (often called a Passlock or Passkey relearn). This syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that typically involves turning the key on and off in a specific sequence and does not require special tools. Instructions are readily available online for your specific model.
How do I provide my VIN number?
After you complete your purchase, please send us a message with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive the VIN, as the programming is a required step. You can find your VIN on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your insurance and registration documents.
Is this a new part?
No, this is a high-quality, tested used OEM part sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides OEM reliability at a fraction of the cost of a new module.
Will this PCM fix my vehicle’s problem for sure?
This module will resolve any issues directly caused by a faulty PCM. However, it’s crucial to ensure your vehicle has been properly diagnosed. This part will not fix problems related to other faulty components like sensors, wiring, or mechanical issues.