Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Escalade EXT or other GM vehicle suffering from frustrating issues like a persistent check engine light, erratic shifting, a no-start condition, or poor fuel mileage? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your engine. A faulty PCM can disrupt everything from fuel delivery to spark timing, leaving you stranded and facing a costly repair bill from the dealership. This replacement PCM is the reliable, cost-effective solution to get your vehicle back on the road with confidence.
We take the guesswork and extra expense out of the equation. Unlike a standard replacement part that requires a trip to the dealer for expensive programming, this module arrives at your door ready for installation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance for your specific vehicle configuration. This is the most direct path to resolving complex electronic issues and restoring the smooth, reliable operation you expect from your truck.
A Technician’s Notebook: The Intermittent Stall
I had a 2005 Silverado 2500 in the bay that was a real head-scratcher. The owner said it would run fine for an hour, then suddenly stall at a stoplight and refuse to restart for 20 minutes. No consistent codes, just a random U0100 ‘Lost Communication with ECM/PCM’ every now and then. We checked grounds, wiring, and the fuel pump—all perfect. On a hunch, I monitored PCM data streams while using a heat gun on the module itself. Sure enough, as the PCM’s internal temperature rose, the data output went haywire before cutting out completely. The internal processor was failing under thermal stress, a common issue for these units located in the hot engine bay. A new, properly programmed PCM like this one solved the problem permanently. The customer went from being frustrated with an unreliable truck to having his dependable workhorse back.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) is illuminated
- ✔ Engine cranks but will not start
- ✔ Rough or unstable idle
- ✔ Poor acceleration and overall engine performance
- ✔ Decreased fuel economy
- ✔ Automatic transmission shifts harshly or at the wrong times
- ✔ Diagnostic trouble codes (DTCs) stored, especially P0601, P0606, or U0100
- ✔ Unexplained stalling or cutting out while driving
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- ✔ Locate the PCM: On most compatible GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, under or next to the battery tray. You may need to remove the battery to gain access.
- ✔ Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before pulling. Inspect them for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s typically held in by a few bolts.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- ✔ Reconnect Battery: Reinstall the battery if you removed it, and reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You must perform a security relearn procedure 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, then ‘OFF’ for 10 seconds, and repeating this cycle three times. Your vehicle should then start and run normally.
Verified Vehicle Compatibility
This module, part number 12582605, is a direct replacement for service numbers 89017750, 12589463, 12602802, 89017734, and 28042802. It is guaranteed to fit the following vehicles:
- Cadillac: 2003-2006 Escalade, Escalade ESV, Escalade EXT
- Chevrolet: 2003-2006 Avalanche 1500, 2003-2007 Silverado 1500/2500/3500 (Classic style for ’07), 2003-2006 Suburban 1500/2500, 2003-2006 Tahoe, 2003 SSR, 2003 Trailblazer EXT (5.3L)
- GMC: 2003-2007 Sierra 1500/2500/3500 (Classic style for ’07), 2003-2007 Sierra Denali (Classic style for ’07), 2003-2006 Yukon, 2003-2006 Yukon XL 1500/2500, 2003 Envoy XL (5.3L)
- Hummer: 2003-2007 H2
- Isuzu: 2003 Ascender (5.3L)
Note: Please verify your specific model options and engine size against the detailed fitment list. For certain 2004 models, matching the ID 12602802 is required.
Frequently Asked Questions
What exactly does “VIN Programmed” mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and all related factory software into the PCM before we ship it. This ensures the module works perfectly with your engine, transmission, and options, eliminating the need for a trip to the dealership for programming.
Do I need to do anything after I install it?
Yes. After physical installation, you must perform a standard GM Security Relearn Procedure. This simple process syncs the new PCM to your vehicle’s anti-theft system and typically takes about 30 minutes using only your ignition key. Instructions are included.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship your order until we receive this information, as programming is a required step.
Is this a brand new part?
This is a high-quality, tested replacement part that has been verified to meet or exceed original equipment specifications. It is loaded with the newest available GM software for your vehicle to ensure maximum reliability and performance.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM also controls transmission functions, including shift points and line pressure. If your transmission issues are caused by faulty signals from a failing PCM, this part is the correct solution.
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. This part is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.