2003-2004 Silhouette PCM 89017735 | Programmed to Your VIN

Restore Your Oldsmobile’s Performance and Reliability

Is your 2003-2004 Oldsmobile Silhouette running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs that the vehicle’s central computer, the Powertrain Control Module (PCM), is failing. As the brain of your engine and transmission, a faulty PCM can cause a cascade of frustrating issues, from poor fuel economy to erratic shifting. This isn’t just an annoyance; it’s a critical component for your minivan’s health and safety. This replacement module, part number 89017735, is the definitive solution to restore your vehicle’s factory performance.

We take the biggest headache out of the repair process. Unlike getting a module from a junkyard or a big-box store, this unit arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We flash it with the latest GM software updates, ensuring all factory improvements for fuel delivery, emissions, and transmission logic are already loaded. This means no expensive trip to the dealership for programming—a savings of time and hundreds of dollars. For the DIY mechanic or the professional shop, this is the most efficient path to a successful repair for your 2003-2004 Silhouette PCM.

Signs Your GM’s Engine Computer is Failing

If you’re experiencing any of the following, a failing PCM is a very likely culprit. In my 20+ years of diagnostics, I’ve seen these symptoms countless times on this GM platform. A new, correctly programmed module is often the final fix after other parts have been needlessly replaced.

• ✔ Unexplained Check Engine Light (CEL), often with codes like P0601, P0602, or other communication errors.
• ✔ Engine stalling, stumbling, or hesitating during acceleration.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ A no-start condition where the engine cranks but won’t fire up.
• ✔ Noticeable decrease in fuel mileage.
• ✔ Failure to pass an emissions or smog test.

A Straightforward Guide to Installation

Replacing the PCM on these GM minivans is a job most DIYers can handle in under an hour. The module is typically located inside or next to the air filter housing in the left-hand (driver’s side) of the engine compartment, making it easily accessible.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
2. Locate the PCM: Open the hood and find the air filter box on the driver’s side. The PCM is often mounted directly to it or on a bracket nearby.
3. Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before they can be pulled away. Avoid forcing them.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
5. Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
6. Reconnect the Battery: Reattach the negative battery terminal.
7. Perform Security Relearn: This is a critical step. You will likely need to perform a security relearn procedure (often called a Passlock relearn). A common method is to turn the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeat this cycle three times. Your vehicle’s service manual will have the exact procedure. This allows the new PCM to sync with your vehicle’s anti-theft system.

Verified Compatibility for Your Vehicle

This module is a direct-fit replacement for a wide range of GM vehicles. Please verify that your make, model, and year are listed below. This part is a direct replacement for part numbers 12583827 and 12583826.

Frequently Asked Questions