Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Chevrolet Tahoe or other GM vehicle suffering from frustrating, hard-to-diagnose issues? An intermittent Check Engine Light, sudden stalling, poor fuel economy, or erratic transmission shifting can often be traced back to a single component: a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its proper function is critical. This replacement PCM, part number 89017750, is the reliable, straightforward solution to get your vehicle running like new again.
The biggest challenge with replacing a PCM has always been the expensive and time-consuming programming required. We eliminate that hassle. Before we ship your part, our technicians will program it with the latest official GM software, tailored specifically to your vehicle using the VIN you provide. This means no trip to the dealership and no special tools required for programming—just a simple installation process to get you back on the road.
A Technician’s Notebook: The Intermittent Stall Case
I remember a 2005 Suburban that came into my bay with a complaint that stumped two other shops. The owner said it would randomly stall at traffic lights, but never set a consistent trouble code. After hours of checking wiring and sensors, a deep scan finally revealed a history of intermittent U0100 (Lost Communication With ECM/PCM) codes. Experience pointed me to the PCM itself. We installed one of our pre-programmed modules, and the problem vanished instantly. The internal circuitry was failing under specific heat conditions, a common issue these units face over time. This isn’t just a part; it’s a permanent fix.
Is Your GM Truck Exhibiting These Faults?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution your vehicle needs:
- âś” Persistent Check Engine Light (CEL)
- âś” Engine stalling or cutting out unexpectedly
- âś” No-start or difficult starting conditions
- âś” Noticeable decrease in fuel efficiency
- âś” Harsh or erratic automatic transmission shifting
- âś” Communication error codes like U0100
- âś” Internal module failure codes, such as P0601 or P0606
A Straightforward Guide to Installation
Installing your new 2003-2006 Tahoe PCM is a job most DIY mechanics can handle. Follow these general steps for a successful replacement.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most compatible trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Module: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that must be released before they can be pulled free. Avoid forcing them.
- Remove the Old Unit: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely plug in the electrical connectors. You should hear a click as they lock into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a CASE relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Verified Fitment for These GM Vehicles
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It is guaranteed to fit a wide range of GM models. Please verify your vehicle is on the list below. Note that some 2004 models require matching the ID number 12602802.
Frequently Asked Questions About the 2003-2006 Tahoe PCM
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This ensures perfect compatibility with your engine, transmission, and factory options, making the installation process smooth and effective.
Is any additional programming required after installation?
No dealership programming is needed. The module arrives ready to work. However, you will need to perform a simple security/anti-theft relearn procedure, which can be done at home without any special tools. This syncs the new module to your keys.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM (e.g., codes P0601, P0606) or a software issue that our updates correct, then yes, this will resolve the problem. It’s crucial to ensure the root cause of the light isn’t a separate failed sensor or wiring issue.
How do I find my PCM’s service number to confirm a match?
The service number is printed on a sticker on the PCM itself. You can compare it to the compatible numbers listed (89017750, 12582605, etc.) to ensure you’re ordering the correct part. However, our VIN programming guarantees compatibility for the vehicles listed.