Restore Peak Performance to Your GM Truck or SUV
Is your GMC Yukon, Chevy Silverado, or Cadillac Escalade suffering from erratic behavior, poor fuel economy, or a persistent check engine light? The Powertrain Control Module (PCM) is the central computer of your vehicle, managing everything from fuel mixture and ignition timing to transmission shift points. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. This direct-fit replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s reliability and drivability.
The Brain of Your Vehicle’s Operation
Think of the PCM as the command center for your engine and transmission. It constantly processes data from dozens of sensors to make real-time adjustments, ensuring smooth operation, optimal power, and efficient fuel consumption. Over time, heat cycles, vibrations, and electrical stress can cause internal components on the circuit board to fail. This leads to incorrect signals being sent, resulting in poor performance and potential damage to other components if left unaddressed.
From the Diagnostic Bay
We had a 2005 Sierra 2500 with the 6.0L come in with a random misfire that the owner had been chasing for months. He had replaced plugs, wires, coils, and even the crankshaft position sensor, but the intermittent stumble and check engine light (P0300) kept coming back. After hooking up our diagnostic scanner, we noticed the fuel trim data was erratic and the ignition control signals were dropping out intermittently. Instead of throwing more parts at it, we tested the driver circuits within the original PCM and found them to be failing under load. A new, properly programmed PCM solved the issue instantly. It’s a classic case where the root cause is the computer itself, not the parts it’s controlling.
Is Your PCM Failing? Common Symptoms
A failing PCM can manifest in many ways. If you’re experiencing any of the following, your engine computer may be the culprit:
- ✔️ Persistent Check Engine Light with codes related to internal processor failure (e.g., P0601, P0606) or sensor circuits.
- ✔️ Rough or unstable idle.
- ✔️ Engine stalling or cutting out unexpectedly.
- ✔️ Harsh, delayed, or erratic transmission shifting.
- ✔️ A noticeable decrease in fuel economy.
- ✔️ Engine misfires even after replacing spark plugs and coils.
- ✔️ Complete no-start condition where the engine cranks but won’t fire.
- ✔️ Loss of communication with the OBD-II port.
The Perfect Solution: A Programmed 2003-2006 Yukon PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We eliminate the need for expensive dealership programming by flashing this module with the latest GM-certified software updates specifically for your vehicle. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will configure the PCM to match your truck’s exact specifications. This ensures seamless integration and optimal performance right out of the box. This process corrects many factory software bugs and improves overall engine and transmission logic.
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802, covering a wide range of popular GM trucks and SUVs from 2003 to 2007. Please verify the fitment list to ensure compatibility with your specific model.
Installation Note
While the physical installation is straightforward (typically located under the battery on the driver’s side), a security relearn procedure (VATS/Passlock) and a Crankshaft Variation (CASE) relearn will need to be performed after installation. These procedures can often be done without a high-end scan tool and are necessary to sync the new PCM with your vehicle’s anti-theft system and crankshaft position sensor.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before shipment. Just provide your vehicle’s VIN when you order, and it will arrive ready for installation and the final relearn procedures.
What is a CASE relearn?
A CASE (Crankshaft Angle Sensor Error) relearn is a calibration procedure that allows the new PCM to learn the precise position of the crankshaft. This is critical for accurate ignition timing and misfire detection. Many professional scan tools can initiate this procedure.
Will this fix my harsh shifting transmission?
If the harsh shifting is caused by faulty signals or logic from your old PCM, then yes, this part will resolve the issue. The PCM controls transmission line pressure and shift solenoids, so a failing unit is a very common cause of transmission problems.
Where is this part located on my 2004 Silverado?
On most GM trucks and SUVs from this era, including the Silverado, Sierra, Tahoe, and Yukon, the PCM is located in the engine bay on the driver’s side, under or next to the battery tray.
Is this a guaranteed fix for my vehicle’s issues?
This module will fix any issues directly caused by a failing PCM. It’s crucial to properly diagnose your vehicle to ensure the PCM is the root cause. However, the symptoms listed above are highly indicative of PCM failure in these vehicles.