Is Your 1999-2000 Silverado 1500 Acting Possessed?
If you’re dealing with bizarre, unpredictable issues on your truck, you’re not alone. Over my two decades in the shop, I’ve seen countless GMT800 trucks like your Silverado come in with symptoms that leave owners scratching their heads. The engine might crank but won’t start, the transmission shifts hard or at the wrong times, or the dashboard is lit up with a check engine light that won’t go away. The culprit is often the one component that controls everything: the Powertrain Control Module (PCM).
The PCM is the central computer, the literal brain of your truck. It takes information from dozens of sensors and makes thousands of calculations per second to manage everything from fuel injection and spark timing to transmission shift points and emissions controls. After 20+ years of heat, vibration, and electrical cycles, the delicate internal circuits on these modules can begin to fail, leading to corrupted signals and a host of frustrating problems.
Common Symptoms of a Failing GM PCM
A faulty PCM doesn’t always fail completely. It often starts with intermittent issues that get progressively worse. If your Silverado, Sierra, or other compatible GM vehicle is showing these signs, the PCM is a primary suspect:
- โ Unexplained Check Engine Light (CEL) with various communication or performance codes.
- โ Harsh or erratic automatic transmission shifting.
- โ Engine cranks but refuses to start, or stalls unexpectedly.
- โ Significant drop in fuel economy.
- โ Misfires or rough idle even after replacing plugs and wires.
- โ The security or anti-theft light stays on, preventing the engine from starting.
Expert Pro Tip: The Post-Installation “Re-Learn”
Even though this PCM comes programmed to your VIN, your truck’s security system (PassLock/VATS) needs to sync with the new module. This is a simple procedure you can do yourself in about 30 minutes with just the ignition keyโno special tools needed! After installation, attempt to start the engine. It will likely stall, and the security light will flash. Leave the key in the ‘ON’ position for 10-12 minutes until the light goes solid or turns off. Turn the key off for 10 seconds, then repeat the process two more times. On the fourth try, the engine should start and run, confirming the security system has accepted the new PCM. This saves you a tow and a costly trip to the dealer.
The Direct, Programmed Solution
Instead of wrestling with a used module that has the wrong software or paying exorbitant dealership prices for a new one plus programming, this is your direct-fit, ready-to-install solution. We take a quality replacement PCM and flash it with the latest, most stable GM-certified software specifically for your truck. All we need is your Vehicle Identification Number (VIN) at checkout.
This critical programming step ensures the PCM has the correct information for your specific engine, transmission, tire size, and emissions equipment. It’s the key to a smooth installation and restoring your truck’s original performance and reliability.
Guaranteed Fitment for Your Vehicle
This module is a direct replacement for part numbers 9354896, 09354896, and 19109040. It is confirmed to fit the following GM vehicles. Please verify the location on your specific model, as it can vary.
- โ Chevrolet Silverado 1500/2500 & GMC Sierra 1500/2500 (1999-2000): For 8-cylinder models. Typically located in the engine bay, on the driver’s side, underneath the battery tray.
- โ Chevrolet Tahoe & GMC Yukon (2000): For non-Denali, Silverado-style models. Located under the battery.
- โ Chevrolet Suburban 1500/2500 & GMC Yukon XL 1500/2500 (2000): Located in the front driver’s side, under the battery.
- โ Chevrolet Camaro & Pontiac Firebird (1999-2002): For 5.7L V8 models. Located in the engine bay, behind the passenger-side strut tower.
- โ Chevrolet Corvette (1999-2000): Located in the passenger-side area of the engine compartment.
Don’t let a faulty computer keep your truck off the road. Order today, provide your VIN, and get the pre-programmed, reliable heart your vehicle needs to run like new again.