Restore Peak Performance to Your GM Truck or SUV
Is your 1999-2000 Cadillac Escalade, Chevrolet Silverado, or GMC Sierra suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or a no-start condition? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. This vital component manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, it can cause a cascade of problems that are frustrating and difficult to diagnose. This replacement PCM, part number 21811787, is the definitive solution to restore your vehicle’s factory performance and reliability.
We had a 2000 Chevy Tahoe come into the shop with a complaint of harsh, unpredictable shifting and a check engine light that multiple shops couldn’t solve. They had already replaced sensors and even serviced the transmission, but the problem persisted. After hooking up our diagnostic tools, we noticed erratic data coming from the PCM. It wasn’t communicating correctly with the transmission control module. Instead of a costly transmission rebuild, the fix was a properly programmed PCM. We installed a VIN-matched unit like this one, performed the security relearn, and the Tahoe drove out shifting as smoothly as it did the day it left the factory. It’s a powerful reminder that the PCM is the true conductor of your vehicle’s powertrain orchestra.
Is Your Vehicle Exhibiting These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it might be time for a replacement:
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable decrease in fuel economy
- ✔ The engine cranks but refuses to start
- ✔ Failure to pass state emissions testing
- ✔ Communication errors with diagnostic scan tools
The Importance of a VIN-Programmed 1999-2000 Escalade PCM
Simply installing a used module from another vehicle will not work. Modern vehicles require the PCM to be programmed specifically to their Vehicle Identification Number (VIN). This process ensures all vehicle-specific options, security information (anti-theft), and emissions calibrations are correct. Our service eliminates the guesswork and the need for expensive dealership programming. When you order from us, we flash the module with the latest GM-certified software updates for your exact VIN. This means your new 1999-2000 Escalade PCM arrives at your door ready for a straightforward installation. Once installed, you may need to perform a simple security relearn procedure, which can typically be done without special tools.
Guaranteed Fitment and Compatibility
This module is a direct replacement for several original equipment part numbers, including 16263494, 16265035, and 8162634940. It is engineered to fit a wide range of GM trucks and vans from the late 1990s and early 2000s. Please verify your vehicle in the comprehensive list below to ensure proper fitment.
ASTRO 00-01 Electronic Control Module; (LH front by battery), ID 16263494
BLAZER S10/JIMMY S15 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
BLAZER S10/JIMMY S15 99-00 Electronic Control Module; (RH front engine compartment)
BRAVADA 98 Electronic Control Module; (6-262, 4.3L), w/build date opt ZN4
BRAVADA 99-00 Electronic Control Module; (RH front engine compartment)
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, (LH engine compartment), ID 16263494
CHEVROLET 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
CHEVROLET 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
CHEVROLET 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ENVOY 98 Electronic Control Module; (RH front engine compartment), w/build date opt ZN4
ENVOY 99-00 Electronic Control Module; (RH front engine compartment)
ESCALADE 99 Electronic Control Module; (LH front engine compartment), ID 16263494
ESCALADE 00 Electronic Control Module; (LH front under battery)
EXPRESS 1500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
EXPRESS 2500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
EXPRESS 3500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
GMC 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, (LH engine compartment), ID 16263494
GMC 2500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
GMC 2500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
GMC 3500 PICKUP 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
GMC 3500 PICKUP 00 Electronic Control Module; gasoline (LH front engine compartment)
ISUZU HOMBRE 98 Electronic Control Module; 4.3L (6 cylinder), w/extended build date opt ZN4
ISUZU HOMBRE 99-00 Electronic Control Module; (RH front engine compartment), 4.3L (6 cylinder)
S10/S15/SONOMA 98 Electronic Control Module; 6-262 (4.3L), w/build date opt ZN4
S10/S15/SONOMA 99-00 Electronic Control Module; (RH front engine compartment), 4.3L
SAFARI (GMC) 99-01 Electronic Control Module; (LH front by battery), ID 16263494
SAVANA 1500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), ID 16263494
SAVANA 2500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SAVANA 3500 VAN 99-02 Electronic Control Module; (LH rear engine compartment), gasoline, ID 16263494
SIERRA 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
SUBURBAN 1500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
SUBURBAN 2500 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
TAHOE 99 Electronic Control Module; gasoline (LH front engine compartment), ID 16263494
TAHOE 00 Electronic Control Module; Classic style (LH front engine compartment)
YUKON 99 Electronic Control Module; (LH engine compartment), ID 16263494
YUKON 00 Electronic Control Module; (LH front under battery), Denali
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send your old part to us. This is an outright purchase of a replacement module.
How do I provide my VIN number?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot program and ship your module until we receive this information.
Is this PCM difficult to install?
Installation is generally straightforward for someone with basic mechanical skills. It involves disconnecting the battery, unplugging the electrical connectors from the old PCM, unbolting it, and then reversing the process. The most important step after installation is the security relearn procedure, which pairs the new PCM to your vehicle’s anti-theft system.
What is a security relearn procedure?
This is a simple procedure that allows your vehicle to recognize the new PCM. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating this cycle three times. We include detailed instructions for this process with your order.
Will this fix my check engine light?
If the check engine light and associated codes are caused by a faulty PCM, then yes, this replacement part will resolve the issue. However, it’s always best to have the codes professionally diagnosed to ensure the PCM is the root cause and not a separate sensor or wiring problem.