Is Your 2001 GM HD Diesel Truck Running Rough?
The Powertrain Control Module (PCM) is the central command center for your truck’s engine and transmission. When it begins to fail in a 2001 GMC Sierra, Sierra 3500, or Chevrolet Silverado, it can cause a cascade of frustrating and hard-to-diagnose issues. From a truck that won’t start to erratic performance and persistent check engine lights, a faulty PCM can leave you stranded. This direct-fit replacement Powertrain Control Module, part number 97780077, is the definitive solution to restore your vehicle’s factory performance and reliability.
We take the guesswork and high dealership costs out of the equation. Each module is meticulously programmed with the latest GM software updates specifically for your truck using the Vehicle Identification Number (VIN) you provide. This ensures that all engine parameters, transmission shift points, and emissions controls operate exactly as the manufacturer intended, making for a straightforward installation process.
We had a 2001 Silverado 2500 with the 6.6L Duramax towed in with a classic intermittent no-start condition. The owner had already replaced the batteries, starter, and even the fuel filter assembly. We could communicate with every module except the PCM. After checking all power and ground circuits to the module and finding them solid, we knew we were dealing with an internal PCM failure. We installed one of our VIN-programmed units, performed the security relearn, and the truck fired up instantly and ran perfectly. It saved the customer from a massive dealership bill and got his work truck back on the road the same day.
Symptoms of a Failing 2001 GM Diesel PCM
- ✔ Check Engine Light: The light is on with communication-related trouble codes (U-codes) or false sensor readings.
- ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an excessive amount of time to fire up.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, or a significant drop in fuel economy.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, at the wrong times, or not at all.
- ✔ Engine Stalling: The engine may stall unexpectedly while driving or at an idle.
- ✔ Failed Emissions Test: Inability to pass a smog check due to monitor readiness issues or stored trouble codes.
The Reliable Solution: A Programmed 2001 Sierra 3500 PCM
Don’t let a faulty computer sideline your powerful diesel truck. Our service provides you with a fully functional PCM that is ready for installation right out of the box. By programming the module to your VIN, we ensure it communicates flawlessly with all other systems in your vehicle. This unit is a direct replacement for part numbers 9388505, 97780075, 97780077, and 9355100, and is located on the driver’s side of the engine bay, under the battery. Simply provide your VIN after purchase, and we’ll handle the complex programming, saving you a trip to the dealer.
Guaranteed Fitment
This Electronic Control Module is a confirmed fit for the following vehicles with the diesel engine option:
- 2001 Chevrolet Silverado 2500 HD
- 2001 Chevrolet Silverado 3500
- 2001 GMC Sierra 2500 HD
- 2001 GMC Sierra 3500
Frequently Asked Questions
Is this PCM ready to install when I receive it?
Yes. This PCM is shipped to you pre-programmed to the specific VIN you provide. This makes the installation process much simpler, though a standard security relearn procedure may be required after installation, which can typically be done without special tools.
Where is the PCM located on my 2001 truck?
The PCM is located in the engine bay on the driver’s side (LH side), positioned underneath the battery tray.
How do I provide my vehicle’s VIN?
After you complete your purchase, you will need to send us a message with your 17-digit VIN. We cannot program and ship your module without this information.
Will this part fix my truck’s problems?
This module will correct issues directly caused by a failing PCM. While it resolves the vast majority of the symptoms listed above, it’s always essential to ensure your vehicle has been properly diagnosed. This part will not fix problems related to faulty wiring, sensors, or other mechanical components.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM stands for Powertrain Control Module, which typically controls both the engine and transmission. ECM stands for Engine Control Module. For these 2001 GM diesel trucks, this single unit serves as the PCM, managing all powertrain functions.