Is Your 2001 Silverado or Sierra Diesel Running Rough?
The 6.6L Duramax engine in your 2001 Chevrolet Silverado or GMC Sierra HD truck is a legendary workhorse. However, even the most robust engines rely on a complex brain to manage their operations—the Powertrain Control Module (PCM). When this critical component begins to fail, it can lead to a host of frustrating and difficult-to-diagnose problems, from a simple check engine light to a truck that won’t start at all. If you’re experiencing perplexing electrical or performance issues, a failing PCM is a likely culprit.
This replacement PCM, part number 09388505 (also compatible with 97780075, 977800770, 9355100), is the definitive solution to get your truck back to its factory-spec performance. We take the guesswork out of the repair by programming the module specifically to your truck’s Vehicle Identification Number (VIN) before it ships. This ensures 100% compatibility with all your vehicle’s systems and installs the latest software updates from GM, addressing potential bugs and improving overall function.
From the Diagnostic Bay
We once had a 2001 Sierra 3500 tow truck come in that would crank strong but wouldn’t fire up. The driver was stranded and losing money every hour the truck was down. We checked all the basics: fuel pressure was solid, the crank sensor was sending a signal, and there were no obvious wiring issues. The scan tool would connect but showed no trouble codes. After hours of chasing our tails, we checked the power and ground pins at the PCM—all perfect. On a hunch, we connected a known-good PCM. The truck roared to life instantly. The original PCM had an internal failure on the injector driver circuit that was invisible to the scan tool, a classic and frustrating failure mode for these modules.
Common Symptoms of a Failing 2001 GM Diesel PCM
- ✔ Persistent Check Engine Light with communication-related codes (U-codes).
- ✔ Intermittent or complete no-start conditions where the engine cranks but won’t fire.
- ✔ Noticeable drop in engine power, poor acceleration, or rough idling.
- ✔ Erratic or harsh transmission shifting, as the PCM communicates directly with the TCM.
- ✔ Specific diagnostic trouble codes related to injector circuits or sensor reference voltage.
- ✔ The scan tool is unable to communicate with the engine control module.
- ✔ Unexplained stalling while driving or at a stop.
The Direct Solution: A Programmed 2001 GM Diesel PCM
Don’t settle for a generic, off-the-shelf part that requires expensive dealer programming. Our process is designed for the professional technician and the skilled DIYer alike. By providing your VIN during checkout, you receive a module that is ready for installation. This unit is meticulously inspected and then flashed with the most current GM calibration for your exact vehicle. This process is critical for the complex electronics of the Duramax platform, ensuring that fuel delivery, timing, and transmission communication are all perfectly synchronized. This is the most reliable and efficient way to restore your truck’s brain to perfect working order.
Installation & Setup
The PCM is located on the driver’s side of the engine bay, mounted to the front of the fender, just below the battery tray. Installation involves disconnecting the battery, removing the old module, and plugging in the new one. In many cases, a simple security relearn procedure is required after installation, which can be done without special tools. We can provide instructions for this process. Getting your heavy-duty truck back on the road has never been more straightforward.
Frequently Asked Questions
Is this PCM a plug-and-play part?
Yes, because we program it to your vehicle’s specific VIN before shipping, it is designed to be as close to plug-and-play as possible. In some cases, a vehicle security relearn procedure may be required, which is a simple process you can perform yourself. Instructions can be provided.
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct GM-certified software and calibrations for your truck’s specific configuration.
Where is the PCM located on my 2001 Silverado or Sierra?
The Electronic Control Module (PCM) is located in the engine bay on the driver’s side. You’ll find it mounted vertically in front of the wheel well, just underneath the battery tray.
Will this fix my specific problem?
This module will resolve issues directly caused by a faulty PCM. While the symptoms listed above are common indicators of PCM failure, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.
What models does this part fit?
This PCM is for the 2001 Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 pickup trucks equipped with the diesel engine. The module is located on the LH front, under the battery.