Restore Peak Performance to Your GM Truck
Is your 1999-2000 Silverado 2500 running rough, shifting erratically, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. A faulty PCM can cause a host of frustrating issues, from poor fuel economy and stalling to a complete no-start condition. This replacement PCM, part number 09354896, is the reliable, straightforward solution to get your truck back on the road and running like it should.
We take the guesswork and extra expense out of the repair. Unlike sourcing a part from a salvage yard or a dealership, this module comes fully programmed to your truck’s specific Vehicle Identification Number (VIN). We install the latest GM software updates before it ships, ensuring optimal engine and transmission performance. This means no extra trip to a mechanic for expensive programming—it’s ready to install right out of the box.
From the Diagnostic Bay
I remember a 2000 Silverado 2500 that came into my shop with a problem that had stumped two other mechanics. The owner complained of random stalling at stoplights and harsh, unpredictable transmission shifts. There were no consistent trouble codes, just a general feeling that the truck was ‘possessed.’ After checking all the usual suspects—fuel pressure, sensors, wiring—I focused on the PCM. On these GMT800 trucks, heat, vibration, and age can cause microscopic cracks in the PCM’s circuit board. We swapped in a VIN-programmed module, and the difference was immediate. The engine idled smoothly, and the transmission shifted perfectly. It’s a reminder that for these complex electronic issues, replacing the brain is often the most direct and permanent fix.
Is Your Truck Showing These Symptoms?
- ✔ Unexplained Check Engine Light
- ✔ Engine stalling or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Decreased fuel mileage
- ✔ Failure to pass emissions tests
- ✔ Intermittent no-start condition
- ✔ Diagnostic Trouble Codes (DTCs) such as P0601, P0602, or P0606 stored in memory
If you’re experiencing any of these issues, a failing 1999-2000 Silverado 2500 PCM is a highly likely culprit. Replacing it can resolve these problems and restore your vehicle’s reliability.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most 1999-2000 Silverado/Sierra models, the PCM is located under the hood on the driver’s side, beneath the battery tray. You will need to remove the battery to access it.
- ✔ Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses connected to the old PCM. These connectors have locking tabs that need to be released before pulling.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module, ensuring they click securely into place. Reinstall the battery and connect the negative battery terminal.
- ✔ Final Check: Start the engine. The Check Engine Light may stay on for a short period as the truck’s systems recalibrate. A short drive cycle is often required for all systems to normalize.
Verified Vehicle Compatibility
This module is a direct replacement for part number 09354896 and interchanges with 19109040. It is guaranteed to fit the following GM vehicles:
- CAMARO: 1999-2002 (5.7L)
- CORVETTE: 1999-2000
- FIREBIRD: 1999-2002 (5.7L)
- SIERRA 1500 PICKUP: 1999-2000 (8 cylinder)
- SIERRA 2500 PICKUP: 1999-2000
- SILVERADO 1500 PICKUP: 1999-2000 (8 cylinder)
- SILVERADO 2500 PICKUP: 1999-2000
- SUBURBAN 1500/2500: 2000
- TAHOE: 2000 (Silverado style)
- YUKON: 2000 (excluding Denali)
- YUKON XL 1500/2500: 2000
Frequently Asked Questions
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls the engine’s fuel injection, ignition timing, and the automatic transmission’s shift points to ensure optimal performance, fuel economy, and emissions.
Does this PCM really come programmed for my truck?
Yes. After your purchase, you must provide us with your vehicle’s 17-digit VIN. We use this to flash the module with the correct, latest GM factory software for your specific vehicle. It arrives ready to install, with no dealer visit required.
Where is the PCM located on my 1999 Silverado 2500?
The PCM is typically located in the engine bay on the driver’s side, mounted in a bracket underneath the battery and battery tray.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the PCM (common codes include P0601-P0606), then this part is the correct fix. However, you should always have the codes read with a scanner to confirm the source of the problem, as the light can also be triggered by faulty sensors or other components.
What happens if I install this without a security relearn procedure?
For many of these GM vehicles, a simple security relearn procedure is required after installation, which prevents theft. This procedure can be done by the owner without special tools and typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle will not start until this is completed.
Is this part the same as an ECM?
Yes, the terms PCM (Powertrain Control Module) and ECM (Engine Control Module) are often used interchangeably for this component, as it controls both engine and transmission functions.