Restore Peak Performance to Your GM Truck or SUV
Is your 1999-2000 Cadillac Escalade, or another compatible GM vehicle, suffering from frustrating issues like a persistent Check Engine Light, rough idling, poor fuel mileage, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as your vehicle’s brain. When it falters, everything from engine timing to transmission shifting can be thrown into chaos. This isn’t just an annoyance—it affects your vehicle’s reliability and safety.
This replacement PCM is the definitive solution. It arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest official GM software updates, which often correct drivability issues and improve performance beyond what the original factory module offered. Forget expensive trips to the dealership for programming; this is a direct-fit, ready-to-install part designed to get you back on the road with confidence.
A Technician’s Notebook: The Ghost in the Machine
I remember a 2000 GMC Yukon Denali that came into my shop with a whole list of bizarre, intermittent problems. The owner was frustrated—he’d replaced sensors, checked wiring, but the truck would still randomly stall at red lights and the transmission would sometimes refuse to shift out of first gear. No consistent codes, just pure chaos. After confirming all the basics were solid, my gut pointed to the PCM. These early GM computers can develop internal faults that don’t always throw a clear P0601 code. We installed a VIN-programmed module, just like this one. The difference was night and day. The engine smoothed out, the transmission shifted perfectly, and the ‘ghost’ was gone. It’s a reminder that sometimes, the most complex problems have a straightforward solution if you replace the core component.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0602, or P0606
- ✔ Vehicle won’t start or is very difficult to start
- ✔ Rough or unstable idle
- ✔ Sudden engine stalling
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass an emissions inspection
A Straightforward Guide to Installation
Replacing the 1999-2000 Escalade PCM is a job most DIYers can handle in their own driveway. Follow these steps for a successful installation:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the Module: On most of these trucks and SUVs, the PCM is located in the engine bay, typically on the driver’s side fender well or near the battery. On Express and Savana vans, it’s often in the LH rear of the engine compartment.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. There are usually two or three large multi-pin connectors. Inspect them for any corrosion or damage.
- Remove the Old PCM: Unbolt the old module from its mounting bracket. Keep the hardware, as you may need to reuse it.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors into the new module until they click into place. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security relearn procedure (often called a Passlock relearn) may be necessary. This simple procedure typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without special tools. Your vehicle’s service manual will have the exact steps.
Guaranteed Fitment for Your GM Vehicle
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. Please verify your vehicle is on the list below. After purchase, you must provide your VIN so we can ensure perfect programming.
ASTRO 99-01 (ID 16263494)
BLAZER/JIMMY S-SERIES 98-00
BRAVADA 98-00
CHEVROLET/GMC 1500/2500/3500 PICKUP 99-00 (Gasoline)
ENVOY 98-00
EXPRESS/SAVANA 1500/2500/3500 VAN 99-02 (Gasoline)
ISUZU HOMBRE 98-00 (4.3L)
S10/S15/SONOMA 98-00 (4.3L)
SAFARI (GMC) 99-01 (ID 16263494)
SIERRA/SILVERADO 1500 PICKUP 99-00 (6-cyl)
SUBURBAN 1500/2500 99 (Gasoline, ID 16263494)
TAHOE/YUKON 99-00 (Classic/Denali)
Note: Some 1998 models require build date option ZN4. Please verify fitment.
Frequently Asked Questions
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to access the exact GM software calibration for your vehicle’s specific engine, transmission, and options. This ensures your new 1999-2000 Escalade PCM works perfectly right out of the box.
Is any additional programming required after installation?
No. This module is sent to you fully programmed. In some cases, a simple ‘key-on’ security relearn procedure may be needed, which you can do yourself in about 15 minutes without any special tools.
What does ‘latest GM software’ mean?
Over the life of a vehicle, manufacturers release software updates to fix bugs, improve transmission shifting, and enhance engine performance. We flash your module with the newest stable version available from GM, ensuring your vehicle runs better than ever.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM (e.g., codes P0601-P0606), then yes, this part is the correct fix. However, you should always diagnose the root cause of the light, as it could also be a bad sensor or other component.
Is this a simple plug-and-play part?
Yes, for the most part. Once we program it with your VIN, the installation is a matter of physically swapping the old module for the new one. No complex computer work is needed on your end.