Is Your Late 90s GM Truck or Van Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a complete no-start condition in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. The PCM is the electronic brain of your vehicle’s engine and transmission, and when it starts to fail, it can cause a cascade of problems that are often misdiagnosed. This can lead to wasted time and money replacing perfectly good sensors and parts. Stop the guesswork and get the definitive solution with our pre-programmed, OEM Powertrain Control Module, part number 9355699.
The Direct Solution for Your 1998-1999 Express 1500 PCM
This isn’t just a generic, off-the-shelf computer. This is a genuine, used OEM module meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN). Upon purchase, you simply provide us with your VIN, and our technicians will flash the module with the latest GM-certified software and calibrations for your exact make, model, and engine configuration. This ensures seamless communication with all other modules in your vehicle and restores the original performance and efficiency you expect. This plug-and-play approach eliminates the need for expensive dealership programming or specialized scan tools for the initial setup.
From the Diagnostic Bay
We had a 1999 Suburban 1500 come into the shop that had its owner at his wit’s end. The truck would run fine for 10 minutes, then suddenly stall and refuse to restart for an hour. The owner had already replaced the fuel pump, crank sensor, and ignition control module based on advice from forums. When we hooked up our professional scanner, we saw intermittent communication loss with the PCM. After checking the power and ground circuits to the module and finding them solid, we knew the internal logic of the original PCM was failing. We installed one of these VIN-programmed 9355699 modules, performed the quick security relearn, and the truck ran perfectly. It’s a classic case where chasing symptoms costs more than diagnosing the root cause – the faulty engine computer.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various trouble codes (DTCs), especially communication or internal processor fault codes.
- ✔ Engine stalls unexpectedly or for no apparent reason.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Poor fuel economy and decreased engine power.
- ✔ Rough or erratic idling and hesitation during acceleration.
- ✔ Harsh or incorrect shifting from the automatic transmission.
- ✔ Inconsistent or non-functional gauges on the instrument cluster.
- ✔ Failure to pass an emissions or smog test.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for part number 9355699 and several interchangeable part numbers including 16266645, 16250279, 16258815, and 09366810. It is designed to fit a wide array of 1998-1999 GM trucks, vans, and SUVs, such as the Chevrolet Express, GMC Savana, Tahoe, Yukon, Suburban, C/K Pickups, and many more. Please verify the part number on your original module to ensure a perfect match. Installation is straightforward: disconnect the battery, unplug the electrical connectors from your old PCM, unbolt it, and install the new one in its place. After reconnecting the battery, you will likely need to perform a simple security relearn procedure, which can typically be done without special tools and instructions can be easily found online for your specific model.
Don’t let a faulty computer keep your reliable GM truck off the road. This VIN-programmed PCM is the most effective and efficient way to solve complex electronic issues and restore your vehicle’s proper operation. Order today, provide your VIN, and get back to driving with confidence.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle the programming for you before we ship it. Simply provide your vehicle’s VIN during or after checkout, and we will flash the module with the correct GM software for your specific vehicle. This makes the installation process much simpler.
What is the difference between a PCM and an ECM?
ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. In most modern vehicles, including the ones this part fits, the PCM controls both the engine and the transmission functions. The terms are often used interchangeably, but PCM is technically more accurate for this application.
Will I need to perform any other procedures after installation?
Yes, you will almost certainly need to perform a security relearn procedure, sometimes called a Passlock or VATS relearn. This syncs the new module with your vehicle’s anti-theft system. It’s a simple procedure that usually involves turning the key on and off in a specific sequence. Instructions are widely available online for your specific model.
Is this a new part?
No, this is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. Each unit is inspected and guaranteed to be programmable and operational.
Where is the PCM located on my vehicle?
On most of the compatible trucks and SUVs (like the Tahoe, Yukon, Suburban, and Pickups), the PCM is located in the engine compartment on the driver’s side, often near the fender or firewall. On vans like the Express and Savana, it’s typically found in the rear of the engine compartment on the driver’s side.