Is Your 2001 Duramax Running Rough? It Could Be The ECM.
If you’re experiencing frustrating issues like a no-start condition, poor engine performance, intermittent stalling, or a persistent Check Engine Light on your 2001 Chevrolet Silverado or GMC Sierra HD truck, a failing Engine Control Module (ECM) is a very likely culprit. The ECM is the electronic brain of your Duramax diesel engine, controlling everything from fuel injection timing to transmission shifting. When it starts to fail, it can cause a cascade of problems that can be difficult to diagnose. This replacement ECM, part number 09355100, is the definitive solution to restore your truck’s performance and reliability.
The Direct-Fit Solution: A Programmed 2001 Silverado 3500 ECM
Don’t waste time and money at the dealership. We provide a streamlined solution by shipping this high-quality replacement ECM directly to you, pre-programmed with the latest official GM software updates for your specific vehicle. All we need is your truck’s 17-digit Vehicle Identification Number (VIN) during checkout. This ensures that when the part arrives, it’s ready for a straightforward installation, communicating perfectly with your truck’s other modules right out of the box. This unit is a direct replacement for part numbers 9388505, 97780075, 977800770, and 9355100.
From the Diagnostic Bay
We had a 2001 Sierra 2500 towed in that had stumped two other shops. The truck would run, but it had a dead miss on cylinder 4 and a recurring P0204 (Injector Circuit/Open – Cylinder 4) code. The owner had already replaced the injector, the FICM (Fuel Injection Control Module), and the entire engine wiring harness to no avail. We hooked up our scope and saw a weak, erratic signal coming from the ECM to that injector. The internal driver circuit inside the original ECM had failed. We installed one of our pre-programmed modules, performed a quick CASE relearn, and the truck ran like it just rolled off the assembly line. It’s a classic example of how a faulty 2001 Silverado 3500 ECM can mimic other component failures.
Symptoms of a Failing 2001 Duramax ECM
- ✔ No-start or extended cranking conditions.
- ✔ Check Engine Light (CEL) is on with codes like P0601, P0606, or other communication errors.
- ✔ Drastic reduction in engine power or poor fuel economy.
- ✔ Rough or unstable idle.
- ✔ Harsh or incorrect transmission shifting.
- ✔ Problems with specific injector circuits that aren’t resolved by replacing the injector.
- ✔ The engine stalls unexpectedly while driving.
Installation and Compatibility
This Engine Control Module is a guaranteed fit for the following vehicles equipped with the Duramax diesel engine:
- 2001 Chevrolet Silverado 2500 HD
- 2001 Chevrolet Silverado 3500
- 2001 GMC Sierra 2500 HD
- 2001 GMC Sierra 3500
The ECM is located in the engine bay on the driver’s side (LH), mounted under the battery tray. Installation is straightforward for a competent DIY mechanic. Simply disconnect the battery, remove the old unit, install the new one, and reconnect the battery. While the vehicle will start and run, we highly recommend having a qualified technician with a professional scan tool perform a Crankshaft Variation Relearn (CASE Relearn) to ensure optimal engine timing and performance.
Frequently Asked Questions
Do I need to program this ECM after I receive it?
No. This is the core of our service. We flash the module with the latest GM calibration for your specific VIN before it ships. It arrives ready to be installed, saving you a trip to the dealership.
What is a CASE relearn and is it required?
A CASE (Crankshaft Angle Sensor Error) relearn is a procedure that synchronizes the new ECM with your engine’s crankshaft position sensor. While your truck will typically run without it, performing the relearn with a capable scan tool is highly recommended to clear certain diagnostic codes and ensure the most accurate ignition timing for optimal performance and fuel efficiency.
Where is the ECM located on my 2001 Silverado or Sierra?
You can find the Engine Control Module in the engine compartment on the driver’s side. It is located underneath the battery and battery tray.
How do I provide my VIN for programming?
Please enter your 17-digit VIN in the notes section during checkout. If you forget, you can also reply to your order confirmation email with the VIN. We cannot ship your order until we receive this information.
Is this a brand new part?
This is a quality, tested replacement ECM that has been meticulously inspected to meet or exceed original equipment specifications. It is guaranteed to function correctly once installed in your vehicle.