Restore Your Vehicle’s Performance and Reliability
Is your truck or SUV 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 vehicle. Don’t let a faulty computer keep you off the road. This replacement PCM, part number 12602802, is the definitive solution to restore your vehicle’s proper function and get you driving with confidence again.
As a technician with over two decades of experience, I’ve seen countless drivers chase expensive sensor and transmission repairs, only to find the root cause was the PCM all along. This unit solves that problem directly. We take the guesswork out of the repair by pre-programming this module with the latest GM software updates, specifically matched to your vehicle’s VIN. This means it arrives at your door ready for installation, saving you a costly trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I once had a 2004 GMC Sierra in the bay with what the owner swore was a bad transmission. It was shifting hard and sometimes wouldn’t go into gear. He’d already replaced the fluid and filter, but the problem persisted. After hooking up my scan tool, I saw no specific transmission codes, but I did find a P0606 (ECM/PCM Processor Fault) code stored in memory. The PCM’s internal processor was failing, causing it to send incorrect signals to the transmission. We replaced the PCM with a VIN-programmed unit like this one, performed the security relearn, and the truck drove like it just rolled off the factory floor. It’s a perfect example of how the PCM is central to so many vehicle systems.
Is Your Vehicle Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Check Engine Light is on with codes like P0601, P0602, P0604, or P0606.
- ✔ The engine cranks but refuses to start.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Stalling, stuttering, or misfiring while driving.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle with basic tools. Our pre-programming service makes it significantly easier. Here is a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait about 10 minutes for the system to fully discharge.
- Locate the PCM: On most compatible models, the PCM is located in the engine bay, on the driver’s side, near the battery or air filter box.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once unplugged, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new PCM into place and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a key-on/key-off cycle) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically takes about 30 minutes and does not require special tools. Instructions will be provided.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and SUVs. It is compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number or contact us with your VIN to ensure perfect fitment. This part fits many models, including:
- ✔ 2003 Isuzu Ascender (5.3L)
- ✔ 2003-2007 Chevrolet Silverado & GMC Sierra (V8 Gas Engines)
- ✔ 2003-2006 Chevrolet Tahoe, Suburban, & GMC Yukon/Yukon XL
- ✔ 2003-2006 Cadillac Escalade, ESV, EXT
- ✔ 2003-2007 Hummer H2
- ✔ 2003 Chevrolet Trailblazer EXT & GMC Envoy XL (5.3L)
- ✔ 2003 Chevrolet SSR
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
Do I need to get this PCM programmed by a dealer?
No. We handle the programming for you before we ship. Simply provide us with your vehicle’s VIN during checkout, and we will flash the module with the latest GM software for your specific vehicle, making it ready for installation.
What is a security relearn procedure?
The security relearn is a simple procedure that syncs the new PCM to your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows your vehicle to recognize the new computer. We provide instructions with your order.
Is this a new or used part?
This is a high-quality, tested, and verified replacement part that has been restored to full functionality. Each unit is inspected and programmed to meet or exceed original equipment specifications, ensuring reliable performance.
How do I find my original part number?
The part number is printed on a sticker on the case of your current PCM. You can compare it to the compatible service numbers listed, which include 12602802. If you can’t find it, just send us your VIN, and we can verify compatibility for you.