If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your GM truck, a failing Powertrain Control Module (PCM) is a very likely culprit. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can cause a cascade of confusing issues. This isn’t just a part; it’s the brain of your engine, and when it’s not working right, nothing else will. This replacement PCM is the reliable, straightforward solution to get your truck running like it should.
We take the guesswork and hassle out of the repair. Unlike a generic module from a parts store, this unit is meticulously programmed to your truck’s specific Vehicle Identification Number (VIN) before it even leaves our facility. This means it comes loaded with the latest official GM software updates, which often correct drivability issues that were present even when the truck was new. You get a component that’s truly ready for installation, designed to restore factory performance, fuel efficiency, and transmission shift points.
A Technician’s Notebook
I remember a 2006 Sierra 2500 with the 6.0L that came into the shop. The owner had already replaced the throttle body and a couple of O2 sensors trying to chase down an intermittent stalling problem and a P0601 code (Internal Control Module Memory Check Sum Error). The truck would run fine for days, then suddenly die at a stoplight. After confirming power and grounds to the PCM were solid, we knew the internal processor was failing. We installed a VIN-programmed module just like this one. The P0601 code was gone for good, and the stalling issue never returned. It saved the customer from throwing more money at parts he didn’t need.
Is Your Truck Exhibiting These Faults?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) for internal processor failure, such as P0601, P0602, P0606
- ✔ Communication error codes like U0100 (Lost Communication with ECM/PCM)
- ✔ Unexplained drop in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine cranks but will not start
- ✔ Intermittent stalling or rough idling
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
For most of the compatible GM trucks and SUVs, this is a job a confident DIYer can handle in their own driveway. The key is taking your time and being gentle with the electrical connectors.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray. You may need to remove the battery to gain access.
- Disconnect the Connectors: Carefully unplug the wiring harness connectors from the old PCM. These usually have a locking tab or lever that needs to be released. Do not force them. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed PCM securely onto the bracket.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reinstall the battery and connect the negative terminal.
- Perform Security Relearn (If Necessary): Your vehicle’s anti-theft system may need to be relearned. This is a simple procedure you can do yourself (see our FAQ below).
Verified Vehicle Compatibility
This module is a direct replacement for service number 28042802 and is also compatible with 89017750, 12582605, 12589463, 12602802, and 89017734. Please verify your vehicle is on this list. For some models, matching the ID number is critical.
CADILLAC ESCALADE, ESV, EXT 03-06
CHEVROLET SSR 03
CHEVROLET SUBURBAN 1500/2500 03-06
CHEVROLET TAHOE 03-06
ENVOY XL 03 (5.3L)
GMC SIERRA 1500/2500/3500 & DENALI 03-07 (Classic Style)
GMC YUKON & YUKON XL 1500/2500 03-06
HUMMER H2 03-07
ISUZU ASCENDER 03 (5.3L)
SILVERADO 1500/2500/3500 PICKUP 03-07 (Classic Style)
TRAILBLAZER EXT 03 (5.3L)
Note: Please refer to the detailed fitment data for specific engine and option requirements. For models marked with an ID number, ensure it matches your original part.
Frequently Asked Questions
Frequently Asked Questions
What do I need to do after purchasing?
After you complete your purchase, you must provide us with your 17-digit VIN. We cannot program and ship your module without it. This ensures the software is a perfect match for your vehicle’s factory options.
Is this a simple plug-and-play installation?
Yes, for the most part. Because it arrives pre-programmed, you will not need any special scan tools for software installation. However, on most GM vehicles of this era, you will need to perform a simple security relearn procedure, which syncs the new PCM to your key and anti-theft system.
How do I perform the security relearn procedure?
It’s easy and requires no tools. Simply turn the key to the ‘ON’ position (without starting the engine) and leave it for 10-12 minutes, or until the security light on the dash stops flashing and turns off. Then, turn the key to ‘OFF’ for 10 seconds. Repeat this cycle two more times (for a total of three cycles). On the fourth try, the vehicle should start and run normally.
Will this fix my specific problem?
This module will correct any issues directly caused by a failing PCM. If your vehicle has other underlying mechanical or electrical problems (like a bad sensor or faulty wiring), those will need to be addressed separately. This part is a common solution for the symptoms listed above.
How do I find my PCM’s service number?
The service number is printed on a sticker on the case of your original PCM. You can cross-reference it with the compatible numbers listed in our description to help confirm fitment, though providing your VIN is the most accurate method.