Restore Your Vehicle’s Core Performance and Reliability
Is your 2003 Chevrolet SSR or another compatible GM truck suffering from frustrating and hard-to-diagnose issues? A faulty Powertrain Control Module (PCM) is often the hidden culprit behind problems that can sideline your vehicle. As the central computer, the PCM manages everything from fuel injection and ignition timing to transmission shifting and emissions controls. When it fails, the symptoms can be widespread and confusing. This replacement PCM, part number 89017750, is the definitive solution to restore your vehicle’s factory operation.
The biggest challenge with replacing a PCM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. Before this module ships, our technicians will flash it with the latest GM-certified software using the specific Vehicle Identification Number (VIN) from your truck. This ensures it’s a true plug-and-play solution, ready for installation right out of the box. You get a reliable fix without the dealer hassle, saving you time and money.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2005 Sierra 2500 that came into my shop. The owner was at his wit’s end. He’d replaced sensors and wiring, but the truck would still randomly stall at traffic lights, with no consistent check engine codes. After hooking up my scope, I noticed the 5-volt reference signal would momentarily drop out—a classic sign of an internal PCM failure. The heat cycles were causing a hairline crack in the circuit board to expand and break connection. We installed a VIN-programmed 2003 SSR PCM (the same family of modules) and the problem was solved for good. It’s a reminder that sometimes the ‘brain’ itself is the issue, not the parts it controls.
Is Your Truck Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Specific diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with scan tools (U-codes).
A Straightforward Guide to Installation
Installing your new 2003 SSR PCM is a job most DIY mechanics can handle in under an hour. While specific locations vary slightly, the process is generally the same for the vehicles listed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these GM trucks and SUVs, the PCM is found in the engine bay, either under the battery tray on the driver’s side or next to the air filter box.
- Disconnect the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be released—don’t force them. Once disconnected, unbolt the module from its bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Reconnect Power: Reattach the negative battery terminal and tighten it.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits a wide range of GM vehicles. Please verify your model and year below. Note that for some years, matching the ID number (e.g., 12602802) is critical.
ENVOY XL 03 (5.3L)
ESCALADE / ESV / EXT 03-06
HUMMER H2 03-07
ISUZU ASCENDER 03 (5.3L)
SIERRA 1500 PICKUP 03-07 (Classic)
SIERRA 2500 PICKUP 03-07 (Classic, 6.0L Gas)
SIERRA 3500 PICKUP 03-07 (Classic, 6.0L Gas)
SIERRA DENALI 03-07 (Classic)
SILVERADO 1500 PICKUP 03-07 (Classic)
SILVERADO 2500 PICKUP 03-07 (Classic, 6.0L Gas)
SILVERADO 3500 PICKUP 03-07 (Classic, 6.0L Gas)
SSR 03
SUBURBAN 1500 03-06
SUBURBAN 2500 03-06 (6.0L)
TAHOE 03-06
TRAILBLAZER EXT 03 (5.3L)
YUKON 03-06
YUKON XL 1500 03-06
YUKON XL 2500 03-06 (6.0L)
Frequently Asked Questions
Frequently Asked Questions
What information do you need to program my PCM?
After you place your order, we will need you to provide your vehicle’s 17-digit VIN. This allows us to load the exact software and calibrations for your specific make, model, and options.
Is this a simple plug-and-play part?
Yes! Because we program it to your VIN before shipping, it arrives ready to be installed without needing a trip to the dealer for software flashing. A simple security relearn procedure may be necessary, which you can do yourself.
How do I confirm this is the right part for my truck?
The best way is to match the service number on your current PCM’s sticker to one of the compatible numbers listed (e.g., 89017750, 12602802). You can also use the compatibility list provided as a guide.
Will this fix my transmission problems?
If your shifting issues are caused by faulty signals from the PCM, then yes, this will resolve them. The PCM controls shift points and line pressure, so a healthy module is critical for proper transmission function.
Is this a quality, reliable part?
Absolutely. We provide dependable, tested modules that are programmed to meet or exceed original factory specifications, ensuring a long-lasting and effective repair for your vehicle.