Is Your Late-90s GM Truck or SUV Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition in your 1999 Cadillac Escalade, Chevy Tahoe, GMC Yukon, or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the brain of your vehicle, controlling everything from fuel injection and ignition timing to transmission shifting. When it falters, the symptoms can be widespread and difficult to diagnose, leaving you stranded and facing costly repair bills.
Don’t let a faulty computer sideline your reliable truck. This is a direct replacement Powertrain Control Module, part number 09355699 (also compatible with 16250279 and 09366810), designed to restore your vehicle’s original performance and reliability. The best part? We handle the complex programming for you. Simply provide your vehicle’s VIN during checkout, and our technicians will flash the module with the latest, most stable GM-approved software for your specific vehicle. This eliminates the need for an expensive trip to the dealership for programming.
We had a 1998 GMC K2500 with the 5.7L come into the shop with a bizarre issue. The owner complained of intermittent stalling at stop lights and a transmission that seemed to shift harshly out of nowhere. He had already replaced the fuel pump and the throttle position sensor, but the problem persisted. After hooking up our professional scan tool, we noticed erratic data from multiple sensors, but none were consistently failing. This pointed us towards the central processing unit – the PCM. Instead of communicating clearly, the old module was sending garbled signals. We installed one of our VIN-programmed PCMs, performed a quick security relearn, and the truck ran like it just rolled off the assembly line. It’s a classic case where chasing individual symptoms can be misleading when the core problem lies with the computer itself.
Symptoms of a Failing Powertrain Control Module
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Failure to pass emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Why Choose Our 1999 Escalade PCM Solution?
Getting your vehicle back to peak condition is our priority. This isn’t just a part in a box; it’s a comprehensive solution. Each module is meticulously inspected and then programmed specifically to your vehicle’s VIN. This ensures that all factory parameters for your engine, transmission, and emissions equipment are perfectly matched. Using the latest GM software updates means you benefit from any improvements and fixes that have been released since your vehicle was new, often resulting in smoother operation and better efficiency. This plug-and-play approach drastically simplifies the repair process for you or your mechanic.
Simple, Hassle-Free Installation
Installation is straightforward. Once you receive your pre-programmed module, simply disconnect the battery, remove the old PCM, and install the new one. After reconnecting the battery, you may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn), which can typically be done without special tools and takes about 30 minutes. Instructions for this procedure are widely available online or in service manuals for your specific vehicle. This step ensures the new PCM communicates with your vehicle’s anti-theft system. In some cases, a Crankshaft Variation Relearn (CASE) may also be needed, which requires a capable scan tool.
This module is a reliable and cost-effective way to solve complex electronic issues and restore the performance you expect from your GM truck or SUV. Get back on the road with confidence.
Frequently Asked Questions
Do I need to send my old PCM in (core charge)?
This listing does not require you to return your old module. There is no core charge associated with this purchase, saving you time and the hassle of return shipping.
What is VIN programming and why is it necessary?
VIN programming involves loading your vehicle’s specific Vehicle Identification Number (VIN) and the corresponding factory software onto the PCM. This is critical because GM trucks and SUVs from this era had many different calibrations for engine size, transmission type, gear ratios, and emissions equipment. Programming ensures the module works perfectly with your vehicle’s unique configuration.
Is this part difficult to install myself?
For someone with basic mechanical skills, the physical installation is quite simple. It typically involves disconnecting the battery and removing a few bolts and electrical connectors. The most important post-installation step is the security relearn procedure, which is required for the vehicle to start. We recommend searching for the specific procedure for your year and model.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s crucial to properly diagnose the problem first. If the light is on due to a bad sensor or another mechanical issue, replacing the PCM will not fix the underlying problem.
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your 17-digit VIN. We cannot program and ship your module until we receive this information. Please double-check the VIN for accuracy to ensure a perfect match.