Programmed 12586242 PCM for 2004 GM Trucks & SUVs | ECM ECU

### Programmed 12586242 PCM for 2004 GM Trucks & SUVs \| ECM ECU   ### Is your 2004 GM truck or SUV running rough, stalling, or showing a persistent Check Engine light? A failing Powertrain Control Module (PCM) can be the source of countless frustrating and hard-to-diagnose issues, leaving you stranded and uncertain. This isn’t just an inconvenience; it’s a breakdown in the reliability you depend on. Restore your vehicle’s core performance and your peace of mind with this direct-fit, professionally programmed Engine Control Module, compatible with service number **12586242**. #### Common Symptoms & Your Solution If you’re experiencing any of the following, a faulty PCM is the likely culprit: - Unexplained Check Engine Light with codes like P0600, P0601, or P0606 - Poor engine performance, hesitation, or misfires - Reduced fuel economy - Harsh or erratic transmission shifting - Complete no-start condition - Communication errors with diagnostic scan tools This module is the definitive solution. We take the guesswork out of the repair by flashing the unit with the latest GM-certified software updates, specifically matched to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that once installed, it communicates perfectly with all other modules, restoring the original performance and efficiency of your engine. This is the exact **programmed 12586242 PCM** you need to get the job done right the first time. #### Features & Benefits - ✔ **VIN-Programmed for Your Vehicle:** Arrives ready for a plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. - ✔ **Loaded with Latest GM Updates:** We flash the module with the most current software, which often corrects factory bugs related to fuel trim, idle stability, and transmission logic. - ✔ **Restores Peak Performance:** A properly functioning PCM is critical for optimal fuel delivery, spark timing, and transmission control, bringing back the power and smoothness you’ve been missing. - ✔ **Direct-Fit Replacement:** Guaranteed to fit and function correctly for all models listed with service numbers **12586242**, **19299226**, **89017738**, and others. - ✔ **Built for Durability:** Engineered to meet or exceed original equipment specifications for long-lasting reliability in your hardworking truck or SUV. - ✔ **One-Year Protection:** This unit is backed by our one-year replacement warranty. An Expert’s Note on Software Updates As a technician, I’ve seen countless cases where a simple software update solves persistent issues that parts-swapping can’t fix. The 4L60E/4L80E transmissions in these 2004 GM vehicles are notorious for developing shifting quirks over time. The updated calibrations we install on this **programmed 12586242 PCM** often contain revised shift schedules and line pressure adjustments that can make a 20-year-old transmission feel significantly smoother and more responsive. You’re not just replacing a part; you’re getting the benefit of years of factory refinements. #### Frequently Asked Questions **Do I need to do anything after I install this PCM?** In most cases, you will need to perform a security relearn procedure, also known as a CASE relearn or Passlock relearn. This is a simple process that can typically be done without special tools and involves a sequence of key turns. This syncs the new PCM to your vehicle’s anti-theft system. Instructions are readily available online for your specific model. **How do I provide my VIN number?** After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship your module without it. Please double-check the VIN for accuracy before sending. **Why is VIN programming so important?** The VIN tells the PCM everything about your vehicle’s specific configuration—engine size, transmission type, axle ratio, tire size, and factory options like cruise control or four-wheel drive. Without correct programming, the vehicle may not start, run poorly, or have features that do not work. Our service ensures a perfect match. **Where is this module located on my vehicle?** For most vehicles in this fitment list, like the Trailblazer, Envoy, and Rainier, the PCM is located in the engine bay, next to the air filter box. For full-size trucks and SUVs like the Silverado, Sierra, and Tahoe, it is typically found under the hood on the driver’s side, mounted near or under the battery tray. **Is this the right part for my vehicle?** Please check the service number on your original computer. This **programmed 12586242 PCM** is a direct replacement for any of the service numbers listed in the description, including YFKD, YFKF, YFXL, and many others. Matching one of these numbers ensures compatibility. Please enter it in the payment notes and save to ensure we receive it. Orders without a VIN within our 2-business-day handling period may be canceled, as programming cannot proceed without it. ### Shipping - **Processing Time:** Reliably shipped within 2-3 business days. ### Warranty Enjoy peace of mind with a **one-year replacement warranty** on this part, effective from the date you receive it. Labor costs are not covered. If the part fails within the warranty period, we’ll replace it with a comparable unit or refund your purchase price, ensuring a hassle-free experience. **Return Address:** **Highway71autoparts** **9131 Highway 71 NE** **Spicer, MN, 56288**

• Country of Origin: United States
• Manufacturer Part Number: YFXL
• Manufacturer Warranty: 1 Year
• Superseded Part Number: 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, YHTN, 12586242
• Year: 2004
• Genuine OEM: Yes
• Interchange Part Number: 590-07275
• Model: envoy-xuv
• Brand: GM