Restore Peak Performance and Reliability to Your GM Truck or SUV
If you’re dealing with frustrating issues like a check engine light that won’t go away, random stalling, poor fuel mileage, or harsh shifting, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM starts to fail, it can create a cascade of problems that are often misdiagnosed. Over my 20+ years in the shop, I’ve seen countless drivers replace perfectly good sensors and other parts, only to find the real culprit was the vehicle’s brain all along.
This isn’t just a replacement part; it’s a comprehensive solution. We take the guesswork and hassle out of the repair by pre-programming this module specifically for your vehicle using your VIN. This ensures it has the latest software updates directly from GM, addressing common factory bugs and improving overall performance and drivability. This 2003 Isuzu Ascender PCM is the reliable fix you need to get your vehicle running smoothly again.
A Technician’s Notebook: The Intermittent Stall Case
A customer brought in his ’05 Silverado 2500 with the 6.0L, complaining of a terrifying intermittent stall at highway speeds. No check engine light, no consistent codes—just a sudden loss of power that would resolve itself after restarting. We checked fuel pressure, ignition components, and even the wiring harness, but everything seemed fine. After days of diagnostics, we finally caught a momentary communication loss from the PCM on our scope. The internal processor was failing under load. We installed a VIN-programmed PCM just like this one, and the problem was solved instantly. It’s a perfect example of how a faulty module can create ghost-like issues that are impossible to pin down without replacing the core component.
Is Your Truck or SUV Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The transmission shifts erratically, harshly, or gets stuck in one gear (limp mode).
- ✔ Noticeable loss of engine power and poor acceleration.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle in their own driveway. Since we program it beforehand, you won’t need a trip to the dealership. Follow these general steps to get back on the road:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most of these GM trucks and SUVs, the PCM is located in the engine bay, either on the driver’s side fender, next to the airbox, or under the battery tray.
- Disconnect the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be released—be gentle to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New PCM: Bolt the new module into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Reconnect the Battery: Attach the negative battery terminal.
- Security Relearn (If Needed): In some cases, you may need to perform a simple security relearn procedure. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your specific model and service number. This part replaces service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802.
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
How do I provide my VIN for programming?
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side dashboard (visible through the windshield), on your vehicle’s registration, or on the driver’s side door jamb sticker. We cannot ship the module until we receive your VIN.
Do I need to have my mechanic program this part?
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side dashboard (visible through the windshield), on your vehicle’s registration, or on the driver’s side door jamb sticker. We cannot ship the module until we receive your VIN.
Is there a difference between a PCM and an ECM?
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side dashboard (visible through the windshield), on your vehicle’s registration, or on the driver’s side door jamb sticker. We cannot ship the module until we receive your VIN.
What if my original part number is different?
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN (Vehicle Identification Number). You can typically find this on your driver’s side dashboard (visible through the windshield), on your vehicle’s registration, or on the driver’s side door jamb sticker. We cannot ship the module until we receive your VIN.