Restore Your Truck’s Brain and Drivability
Is your 2003-2006 Chevrolet Tahoe or GM truck acting up? Dealing with a persistent Check Engine Light, rough idling, or frustrating no-start conditions can sideline even the most reliable vehicle. As the central command center, a failing Powertrain Control Module (PCM) can be the hidden culprit behind these issues. This replacement PCM, part number 12582605, is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and hassle out of the repair by programming the module specifically to your vehicle’s VIN with the latest GM software updates before it even ships. This ensures a seamless installation and gets you back on the road with confidence.
Case Study: A Tricky Diagnosis
I remember a 2005 Silverado 2500 that came into my shop with a problem that had stumped two other mechanics. The truck would randomly stall at stoplights, but never set a consistent trouble code. We checked fuel pressure, sensors, and wiring harnesses for hours. On a hunch, I monitored the PCM data stream during a long test drive and finally saw the 5-volt reference signal flicker just before a stall. The internal voltage regulator in the original PCM was failing intermittently under heat soak. We ordered a VIN-programmed module just like this one. The swap took 15 minutes, and the truck has run flawlessly for the owner ever since. This is why a quality, correctly programmed module is non-negotiable.
Is Your GM Truck Showing These Signs?
A faulty PCM can manifest in various ways. If you’re experiencing any of the following, this module is likely the solution you need. This is especially true if you’re seeing internal processor error codes.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling or cutting out unexpectedly
- ✔ No-start or hard starting conditions
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Communication errors with diagnostic scan tools
- ✔ Stored Diagnostic Trouble Codes (DTCs) such as P0601, P0602, P0606, or U0100
A Straightforward Guide to Installation
One of the biggest benefits of our pre-programmed 2003-2006 Tahoe PCM is the ease of installation. You don’t need expensive scan tools or a trip to the dealership. Just follow these simple steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most compatible GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- Disconnect the Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. The levers can be stiff, so apply steady pressure.
- 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 fasten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click. Reconnect your negative battery terminal.
- Perform Security Relearn (If Needed): In most cases, the vehicle will start and run perfectly. Some vehicles may require a simple security relearn procedure, which typically involves cycling the key and can be done without any special tools. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number or contact us with your VIN to confirm fitment for your specific vehicle. It is compatible with a wide range of GM models, including:
ESCALADE 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE EXT 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 04 Electronic Control Module; (LH front under battery), SUV
SIERRA 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
TAHOE 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
ENVOY XL 03 Electronic Control Module; 5.3L (next to air box)
SUBURBAN 2500 03 Electronic Control Module; (LH front under battery), 6.0L
YUKON 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
AVALANCHE 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
SIERRA 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/o 4.3L
SIERRA DENALI 05-06 Electronic Control Module; (LH front under battery)
SUBURBAN 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
YUKON XL 1500 03 Electronic Control Module; (LH front under battery)
YUKON XL 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE ESV 03 Electronic Control Module; (LH front under battery), PCM
ESCALADE ESV 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 07 Electronic Control Module; (LH front under battery), powertrain control
SIERRA 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 03 Electronic Control Module; (LH front under battery)
HUMMER H2 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON 03 Electronic Control Module; (LH front under battery)
ESCALADE 05-06 Electronic Control Module; (LH front under battery)
ESCALADE ESV 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
AVALANCHE 1500 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SILVERADO 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
TAHOE 03 Electronic Control Module; (LH front under battery)
TAHOE 05-06 Electronic Control Module; (LH front under battery)
YUKON 05-06 Electronic Control Module; (LH front under battery)
SILVERADO 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SILVERADO 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ISUZU ASCENDER 03 Electronic Control Module; (LH engine), 5.3L
SIERRA 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
SIERRA 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
ESCALADE 03 Electronic Control Module; (LH front under battery), PCM
SSR 03 Electronic Control Module; (next to air box)
SIERRA 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 07 Electronic Control Module; classic style (creased door skin), (LH front under battery)
SILVERADO 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 05-06 Electronic Control Module; (LH front under battery)
TRAILBLAZER EXT 03 Electronic Control Module; 5.3L (next to air box)
SILVERADO 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SILVERADO 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/o 4.3L
SILVERADO 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
YUKON XL 1500 05-06 Electronic Control Module; (LH front under battery)
ESCALADE EXT 05-06 Electronic Control Module; (LH front under battery)
SIERRA 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
HUMMER H2 03 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12602802
SILVERADO 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
ESCALADE EXT 03 Electronic Control Module; (LH front under battery), PCM
SIERRA 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON XL 2500 03 Electronic Control Module; (LH front under battery), 6.0L
Frequently Asked Questions
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping. It arrives ready for installation, saving you time and money.
Where do I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a small plate on the driver’s side of the dashboard, visible through the windshield.
What if the part number on my old module is different?
GM often uses several compatible service numbers for the same part. This module replaces 89017750, 12582605, 12589463, and others. As long as your vehicle is on the compatibility list, our VIN programming ensures it will work correctly.
Will I need to perform a CASE relearn after installation?
A Crankshaft Variation (CASE) relearn is sometimes necessary to prevent a P1336 trouble code. While not always required after a swap, it’s a simple procedure that a professional mechanic with a capable scan tool can perform in minutes.
What information do you need from me after I order?
After you complete your purchase, you will need to send us your complete 17-digit VIN. We cannot program and ship your module without it.