Is Your GM Truck Running Rough? The PCM Might Be the Culprit.
If your 2003-2006 GMC Yukon, Sierra, or another compatible GM truck is giving you headaches with a persistent check engine light, erratic shifting, a rough idle, or even a frustrating no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine, when the PCM starts to fail, it can cause a cascade of issues that can be difficult to diagnose. I’ve seen it hundreds of times in my shop: customers spend a fortune replacing sensors only to find the root cause was the engine’s brain all along.
A Technician’s Real-World Experience
“A customer’s 2005 Sierra 1500 came in last week with a P0606 code (PCM Processor Fault) that other shops couldn’t solve. The truck would randomly stall at red lights. After confirming the battery, alternator, and all main power and ground connections to the PCM were solid, we knew the internal processor was failing intermittently. This programmed PCM was the direct-fit solution that got him back on the road safely and permanently fixed the issue.”
The Direct Solution: A VIN-Programmed 2003-2006 Yukon PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and hassle out of the repair. Simply provide us with your vehicle’s 17-digit VIN during checkout, and our technicians will program this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance for your specific vehicle configuration.
Common Symptoms of a Failing GM PCM:
- โ Persistent Check Engine Light (CEL) with various codes
- โ Vehicle refuses to start or stalls intermittently
- โ Harsh or erratic automatic transmission shifting
- โ Noticeable decrease in fuel economy (MPG)
- โ Communication errors with diagnostic scan tools
- โ Engine misfires or runs rough after warming up
Plug-and-Play Installation: No Dealer Visit Required
One of the biggest benefits of our service is that you can avoid a costly trip to the dealership for programming. This module is designed for a straightforward installation that a confident DIYer or any professional mechanic can perform. Follow these simple steps to get your truck running right again.
- Safety First: 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 (like the Yukon, Tahoe, Silverado), the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Old Module: Carefully unplug the electrical connectors. These connectors have locking tabs; be gentle to avoid breaking them. Unbolt the module from its mounting bracket.
- Install the New PCM: Bolt your new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: This is a critical final step. Turn the key to the ‘ON’ position (don’t start the engine) for 10-11 minutes, or until the security light on the dash turns off. Turn the key ‘OFF’ for 10 seconds. Repeat this cycle two more times (for a total of three cycles). Your vehicle will then start and run with the new PCM.
Expert Pro Tip: Connector Inspection
Before plugging in your new PCM, take a moment to inspect the vehicle’s harness connectors. The location under the battery makes them susceptible to corrosion from battery acid fumes or moisture. Use a small brush and a quality electrical contact cleaner to clean any green or white residue from the pins. A clean connection is vital for the longevity and proper function of your new module.
Guaranteed Compatibility
This module, part number 89017734, is a direct replacement for a wide range of GM vehicles and interchanges with the following service numbers: 89017750, 12582605, 12589463, 12602802, and 28042802. Please use the fitment chart to confirm this is the correct part for your specific year, make, and model.