Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Suburban 2500 or other GM truck suffering from baffling electrical gremlins? Issues like intermittent stalling, a persistent check engine light, or a complete no-start condition can often be traced back to a single component: a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, its health is critical for performance, fuel economy, and reliability. When it fails, it can feel like your trusted vehicle has lost its mind. This replacement PCM, part number 12582605, is the definitive solution to get your vehicle back on the road, running as it should.
We take the guesswork and high costs out of the equation. Unlike a generic module from a parts store, this unit arrives at your door pre-programmed with the latest GM factory software, specifically matched to your vehicle’s unique VIN. This means no expensive trips to the dealership for flashing, no special scan tools required—just a straightforward installation to restore function. It’s the ideal fix for both seasoned professional mechanics and determined DIYers.
A Technician’s Notebook
I remember a 2005 Sierra 2500 with the 6.0L that came into my shop on a tow truck. The customer said it would run fine for weeks, then suddenly die at a stoplight and refuse to restart for an hour. He’d already replaced the crank sensor and fuel pump based on other advice. We scanned it and found a U0100 (Lost Communication with ECM/PCM) code stored. After checking all the power and ground circuits to the PCM, we couldn’t find a fault. Everything looked perfect. On a hunch, I used a heat gun on the PCM while the engine was running. Within 30 seconds, the engine sputtered and died. The thermal stress was causing an internal circuit board failure. We installed a VIN-programmed PCM like this one, and the customer never had the problem again. It’s a classic failure mode for these modules.
Common Signs of a Failing PCM
- ✔ Check Engine Light with communication or internal processor codes (e.g., P0601, P0606, U0100).
- ✔ Engine cranks but will not start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection due to module errors.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- ✔ Locate the Module: On most GM trucks and SUVs of this era, the PCM is located in the engine bay on the driver’s side, near the battery and under a plastic cover.
- ✔ Disconnect Connectors: Carefully unclip and remove the electrical harness connectors from the old PCM. The levers can be stiff, so be gentle but firm.
- ✔ Remove the Old PCM: Unbolt the module from its mounting bracket and remove it from the vehicle.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM into the bracket and securely re-attach the electrical connectors. You should hear a ‘click’ as they lock into place.
- ✔ Perform Security Relearn: Reconnect the battery. You will likely need to perform a simple security relearn procedure. Turn the key to the ‘ON’ position for 10-12 minutes, then ‘OFF’ for 30 seconds. Repeat this cycle three times. The vehicle should then start and run normally.
Verified Vehicle Compatibility
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)
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 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)
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
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
How do I provide my VIN for programming?
After you complete your purchase, simply reply to your order confirmation email with your 17-digit Vehicle Identification Number (VIN). We’ll handle the programming before we ship the part to you.
Is this part ready to install right out of the box?
Yes, it arrives programmed and ready for installation. The only additional step required is the vehicle’s security relearn procedure, which is a simple process that does not require any special tools.
What is a security relearn and is it difficult?
It’s a simple, tool-free procedure to sync the new PCM with your vehicle’s anti-theft system. It typically involves cycling the ignition key on and off in a timed sequence. We include easy-to-follow instructions.
Will this 2003-2006 Suburban 2500 PCM work for other part numbers?
Yes, this module is a direct replacement for several service numbers, including 89017750, 12589463, 12602802, 89017734, and 28042802. Please verify your part number or use our fitment list to confirm compatibility.
Do I need to send my old PCM back?
No core charge or return is required for this part. You can keep or responsibly recycle your old module.