Restore Your Vehicle’s Core Performance and Reliability

If you’re dealing with frustrating, hard-to-diagnose issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, the problem often lies with the heart of your vehicle’s electronics: the Powertrain Control Module (PCM). As an experienced technician, I’ve seen firsthand how a failing PCM can cause a cascade of problems that seem unrelated. This isn’t just a part; it’s the central computer responsible for engine performance, fuel economy, and transmission control. This replacement PCM is your direct, reliable solution to get your truck or SUV running right again.

We take the biggest headache out of the repair process. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest GM software updates, specifically flashed to your vehicle’s unique VIN. This means you can skip the expensive trip to the dealership for programming. It’s a true plug-and-play fix designed for both professional mechanics and determined DIYers. By providing us with your VIN at checkout, you ensure that the module you receive is perfectly matched to your vehicle’s factory specifications, restoring its original performance and efficiency.

Common Signs of a Failing PCM

• ✔ Check Engine Light is on with codes like P0601, P0606, or U0100.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drops in fuel efficiency.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Intermittent stalling or rough idling.
• ✔ Communication errors with your scan tool.
• ✔ Failure to pass state emissions testing.

A Straightforward Guide to Installation

Installing your new PCM is a manageable job for most DIYers. Since we’ve handled the programming, your main task is the physical swap. Here’s a typical process for many of the compatible GM trucks:

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system to discharge.
2. Locate the PCM: On most compatible models (like the Silverado, Sierra, and Tahoe), the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray. For the 2003 SSR, it is located next to the air box.
3. Disconnect the Harnesses: The PCM has several large multi-pin electrical connectors. Carefully release the locking tabs or levers and pull the connectors straight out. Never force them. Inspect the connectors for any corrosion or bent pins.
4. Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
5. Install the New PCM: Mount the new, pre-programmed PCM into the bracket and secure it. Reconnect the electrical harnesses, making sure they click securely into place and the locking levers are fully engaged.
6. Reconnect the Battery: Reattach the negative battery terminal.
7. Perform Security Relearn (If Necessary): In many cases, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. This allows the new PCM to synchronize with your vehicle’s anti-theft system. Consult your vehicle’s service information for the exact procedure.

Will This Fit My Truck or SUV?

This module is a direct replacement for service numbers 89017734, 89017750, 12582605, 12589463, 12602802, and 28042802. Please verify your part number or use the compatibility list below. This unit fits a wide range of popular GM vehicles, including:

Note: Compatibility may depend on specific engine options (e.g., 5.3L, 6.0L) and build dates. Matching the service number on your original PCM is the best way to ensure a perfect fit.

Why do I need to provide my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM with the correct software, calibrations, and security information for your specific vehicle. This ensures seamless integration and proper function of all systems, from the engine and transmission to the anti-theft system.

Is any additional programming required after installation?
No dealership programming is needed. Our service includes flashing the module with the latest GM updates matched to your VIN. In some cases, a simple key-cycle “security relearn” procedure may be required, which you can easily do yourself in your driveway in about 30 minutes.

Will this fix my vehicle’s specific problem?
This PCM will correct issues directly caused by a faulty module, such as internal processor errors (P0601), communication failures, and driver circuit faults. While a bad PCM causes many symptoms, it’s crucial to ensure your vehicle’s wiring, sensors, and mechanical components are in good working order. This part is a key component in a proper diagnosis.

What is the difference between a PCM and an ECM?
The terms are often used interchangeably. PCM (Powertrain Control Module) is the more accurate term for modern vehicles as it typically controls both the engine and the transmission. ECM (Engine Control Module) is an older term that usually refers to a module that only controls engine functions. For your 2003 SSR PCM, it manages the entire powertrain.

Where is the service number located on my old PCM?
The service number is printed on a sticker on the case of your original PCM. You will need to physically access the module to read it. Matching this number is a guaranteed way to confirm compatibility before ordering.