Restore Your Truckโs Heartbeat and Your Confidence
Is your truck suffering from puzzling electrical gremlins, a persistent check engine light, or performance issues that just won’t go away? The Powertrain Control Module (PCM) is the central command center for your engine and transmission. When it falters, it can cause a cascade of frustrating problems, leaving you stranded and stressed. This isn’t just a part replacement; it’s about reclaiming the dependable performance and peace of mind you deserve from your vehicle. We take the guesswork and dealership hassle out of the equation by providing a high-quality, fully tested PCM that arrives at your doorstep programmed specifically for your truck’s VIN with the latest GM software updates.
Symptoms of a Failing PCM and the Solution in This Box
If you’re nodding along to any of these warning signs, a faulty computer is a likely culprit. Replacing your module can restore communication, efficiency, and power, making your truck feel years younger.
- โ Check Engine Light: Often with communication error codes like U0100 or internal fault codes like P0601, P0602, or P0606.
- โ Erratic Engine Behavior: Experiencing rough idling, stalling, misfires, or a sudden drop in fuel economy?
- โ Harsh or Incorrect Shifting: Your transmission may shift at the wrong times, slam into gear, or seem to hunt for the right gear.
- โ No-Start Condition: The engine cranks but refuses to start, even with a good battery and starter.
- โ Failure to Communicate: Your OBD-II scan tool can’t connect to the computer, making diagnosis impossible.
An Expert’s Quick Diagnostic Tip
Before you’re certain the PCM is the issue, take 10 minutes to check the basics. A weak battery or a corroded ground wire (especially the main one from the battery to the frame and engine block) can cause voltage drops that mimic the symptoms of a failed computer. Cleaning these connections and ensuring your battery is healthy is a crucial first step that can save you time and money.
Guided Installation for a Confident Repair
You don’t need to be a master mechanic to complete this job. With basic hand tools and a little patience, you can have your truck running smoothly again. This pre-programmed 1999-2000 Sierra 1500 PCM makes the process straightforward.
- Safety First: Begin by disconnecting the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the Old Module: On most of these GM trucks, the PCM is located in the engine bay, on the driver’s side, underneath or near the battery tray.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that may need to be gently pried up. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New PCM: Mount your new, VIN-programmed module securely in the bracket. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Power Up: Reconnect the negative battery terminal and tighten it securely.
- Final Step – Security Relearn: Your vehicle’s anti-theft system (PassLock/VATS) may need to be synchronized with the new PCM. This is a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Search for your specific model’s “VATS relearn procedure” for exact steps.
Tailored Fit for Your GM Vehicle
This module is a direct replacement for part numbers 19109040, 09354896, and 9354896. It is guaranteed to fit and function correctly in the following vehicles, provided the part number matches:
- Cadillac Escalade: 2000
- Chevrolet Camaro: 1999-2002 (5.7L)
- Chevrolet Corvette: 1999-2000
- Chevrolet Silverado 1500/2500: 1999-2000
- Chevrolet Suburban 1500/2500: 2000
- Chevrolet Tahoe: 2000
- GMC Sierra 1500/2500: 1999-2000
- GMC Yukon & Yukon XL 1500/2500: 2000
- Pontiac Firebird: 1999-2002 (5.7L)
Choosing the correct 1999-2000 Sierra 1500 PCM is vital for your truck’s health. By providing us with your VIN, you ensure this part is a perfect, plug-and-drive solution, restoring the performance and reliability you depend on every day.
Frequently Asked Questions
What information do you need from me after I order?
After you complete your purchase, we will need your vehicle’s 17-digit Vehicle Identification Number (VIN). This allows us to program the module with the exact software and calibrations for your truck’s specific options, ensuring a perfect match.
Will I need to do anything after installing this PCM?
Yes, in most cases you will need to perform a simple security relearn procedure, also known as a VATS relearn. This synchronizes the new PCM with your vehicle’s anti-theft system and allows the engine to start. The procedure takes about 30 minutes and only requires your ignition key.
Is this a brand new part from the dealer?
This is a professionally inspected and verified component that has been meticulously tested to meet or exceed original equipment standards. It is then loaded with the latest official GM software for your vehicle, providing a reliable and cost-effective solution.
My truck is shifting hard. Will this fix it?
A failing PCM is a very common cause of transmission shifting problems, as it controls the shift points and line pressure. While this module often resolves those issues, it’s important to ensure the transmission fluid is clean and at the correct level, and that there are no other mechanical or solenoid issues.
How do I know if my original PCM is bad?
Common signs include a persistent check engine light with internal processor fault codes (like P0601), no communication with a scan tool, or multiple unrelated sensor codes appearing at once. If you’ve ruled out wiring, sensor, and power/ground issues, the PCM is the most likely culprit.