Restore Your Truck’s Brainpower and Performance
Is your 1999-2000 GMC Sierra 1500 or Silverado acting up? Intermittent stalling, a persistent Check Engine Light, or strange transmission shifting can often be traced back to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty PCM can cripple an otherwise solid truck. This isn’t just a part; it’s the central computer responsible for engine performance, fuel economy, and transmission control. Replacing it correctly is critical to restoring your vehicle’s reliability.
This module, part number 09354896, is the definitive solution. We take the guesswork and high dealership costs out of the equation. Before we ship, we flash the module with the latest official GM software updates, specifically programmed to your truck’s unique Vehicle Identification Number (VIN). This ensures that all parameters for your engine, transmission, and options are perfectly matched, making installation straightforward and effective.
Case Study: A Tricky Diagnosis
I remember a 2000 Silverado that came into the shop with a ghost of a problem. The owner complained of random stalling at stoplights and a hard 1-2 shift, but it wouldn’t happen every day. There were no consistent trouble codes, just a history of random communication errors. We checked grounds, wiring, and sensors for two days. Finally, on a hunch, we monitored the PCM’s internal temperature data. We saw erratic spikes just before the engine would die. The internal processor was failing under specific heat conditions. We installed a VIN-programmed PCM, and the truck ran flawlessly. It’s a classic example of how a failing 1999-2000 Sierra 1500 PCM can cause symptoms that mimic a dozen other problems.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle stalls unexpectedly while driving or at idle.
- ✔ Failure to pass state emissions testing.
Why Choose a VIN-Programmed Module?
A generic, unprogrammed computer won’t work correctly in your GM truck. Critical systems like the anti-theft (Passlock/VATS), transmission shift points, and fuel injector timing are all tied to the software inside. By providing your VIN, you receive a module that is truly ready for your specific vehicle. This service ensures compatibility and restores the original factory performance and drivability that you depend on.
DIY Installation: Get Your Truck Running Right
- ✔ Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most 1999-2000 GM trucks (Sierra, Silverado, Tahoe, Yukon), the PCM is located under the hood on the driver’s side, typically below or next to the battery in a black plastic bracket.
- ✔ Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. These connectors are color-coded to prevent mix-ups.
- ✔ Remove the Old Module: Unbolt or unclip the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New PCM: Seat your new, pre-programmed module into the bracket and securely re-attach the electrical connectors until they click into place.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 09354896, 19109040, and 9354896. It fits a wide range of GM vehicles, including but not limited to:
- ✔ 1999-2000 SIERRA 1500 PICKUP (8 cylinder, LH front under battery)
- ✔ 1999-2000 SILVERADO 1500 PICKUP (8 cylinder, LH front under battery)
- ✔ 1999-2000 SIERRA 2500 PICKUP (LH front under battery)
- ✔ 1999-2000 SILVERADO 2500 PICKUP (LH front under battery)
- ✔ 2000 TAHOE (Silverado style, LH front below battery)
- ✔ 2000 SUBURBAN 1500/2500 (LH front under battery)
- ✔ 2000 YUKON & YUKON XL 1500/2500 (LH front under battery)
- ✔ 1999-2002 CAMARO (5.7L, behind RH strut tower)
- ✔ 1999-2002 FIREBIRD (5.7L, behind RH strut tower)
- ✔ 1999-2000 CORVETTE (RH engine compartment)
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. After installation, you must perform a security relearn procedure, also known as a VATS or Passlock relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and ignition keys. It’s a simple process that typically involves turning the key to the ‘ON’ position for 10-15 minutes, three times in a row. This procedure does not require any special tools.
How do I provide my VIN?
After you complete your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. The VIN is located on your driver’s side dashboard (visible through the windshield) or on the driver’s door jamb sticker.
Is this a brand new part?
This is a high-quality, tested replacement part that has been verified to meet or exceed original equipment specifications. It is loaded with new, updated GM software specific to your vehicle.
Will this fix my P0601 trouble code?
Yes, in almost all cases. The DTC P0601 (Internal Control Module Memory Check Sum Error) indicates a fatal internal error within the PCM itself. Replacing the module is the standard and correct repair for this specific code.