Is Your 2001 GM Diesel Truck Running Rough?
If your 2001 GMC Sierra or Chevrolet Silverado with the Duramax diesel engine is experiencing perplexing issues like erratic shifting, a persistent Check Engine Light, or even a no-start condition, the culprit is often the Powertrain Control Module (PCM). As the central computer for your truck, the PCM is responsible for managing everything from fuel injection timing and turbo boost to transmission shift points. When it begins to fail, it can create a cascade of problems that are frustrating and difficult to diagnose. This replacement PCM is the definitive solution to restore your truck’s factory performance and reliability.
From the Diagnostic Bay
We had a 2001 Silverado 3500 tow truck come into the shop with a complaint of intermittent stalling and a hard-shifting transmission. The owner had already spent a small fortune replacing sensors and even had the transmission checked out, with no luck. After hooking up our diagnostic scanner, we noticed erratic data readings from multiple sensors at once, which is a classic sign of a faulty computer. Instead of chasing phantom sensor issues, we focused on the central hub: the PCM. After installing one of our VIN-programmed modules, the truck immediately ran smoothly, shifted perfectly, and all sensor data stabilized. The original PCM had internal circuit board failures, sending confusing signals throughout the vehicle. It’s a great reminder that sometimes the ‘brain’ is the problem, not the ‘senses’.
Common Symptoms of a Failing 2001 Sierra 2500 PCM
- ✔ Persistent Check Engine Light (CEL) with various communication or sensor codes.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or hesitating unexpectedly.
- ✔ A complete no-start condition where the engine cranks but won’t fire up.
- ✔ Noticeable decrease in fuel economy.
- ✔ Communication issues with diagnostic scan tools.
- ✔ Problems with the ‘wait to start’ light or other dash warnings.
The Plug-and-Play Solution for Your Truck
Don’t let a faulty computer keep your powerful diesel truck sidelined. This isn’t just a generic, off-the-shelf part. We take the hassle and guesswork out of the replacement process. When you order, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then use official GM equipment to flash the module with the latest, most up-to-date software specifically for your truck’s configuration. This ensures that all parameters for your engine, transmission, and emissions equipment are set correctly from the moment you install it.
This process eliminates the need for an expensive trip to the dealership for programming. The module arrives at your door ready to be installed. Once installed, you will simply need to perform a security relearn procedure, which can often be done without special tools. This restores communication between the new PCM and your truck’s anti-theft system.
Direct-Fit for 2001 GM HD Diesel Trucks
This Powertrain Control Module is a direct replacement for the original unit on the following vehicles equipped with the diesel engine. The module is located on the driver’s side of the engine bay, under the battery tray.
- 2001 Chevrolet Silverado 2500 HD (Diesel)
- 2001 Chevrolet Silverado 3500 (Diesel)
- 2001 GMC Sierra 2500 HD (Diesel)
- 2001 GMC Sierra 3500 (Diesel)
This module replaces part numbers: 9388505, 97780075, 977800770, 9355100.
Frequently Asked Questions
Do I need to program this PCM?
No. This PCM comes pre-programmed to your truck’s specific VIN. You must provide your VIN at checkout so we can flash the module with the correct GM software before shipping it to you.
Where do I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, your insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Will this fix my truck’s hard shifting?
If the hard shifting is caused by a faulty PCM sending incorrect signals to the transmission, then yes, this part is very likely to solve the problem. A failing PCM is a common cause of transmission-related symptoms in these trucks.
Is any additional procedure required after installation?
Yes, after installing the new PCM, you will need to perform a security relearn procedure (also known as a VATS relearn). This syncs the new module with your truck’s anti-theft system and ignition keys. This procedure can typically be done without any special tools and instructions are readily available online.
Where is the PCM located on my 2001 Sierra 2500?
The Electronic Control Module (PCM) on a 2001 Sierra or Silverado with a diesel engine is located in the engine bay on the driver’s side, mounted to a bracket underneath the battery and battery tray.