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Item #:
126830258
2003 Avalanche Engine Computer 12576106 ECM PCM ECU Programmed to Your Vehicle VIN
85% of respondents would recommend this to a friend
Item #:
126830258
XCD 584
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
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In stock
Imported from USA store
QTY:
Order now and get it around Wednesday, October 07
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This E.C.M. is programmed to your V.I.N. to exactly match your vehicle.
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Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.
What Stands Out
Customized Programming
Each ECM is programmed specifically to your VIN, ensuring perfect compatibility and optimized performance for your vehicle.
Direct Replacement
This ECM serves as a direct replacement for your original unit, making installation simple and hassle-free without additional modifications.
Enhanced Performance
Improves engine efficiency and responsiveness, addressing common performance issues effectively, unlike generic alternatives.
Product Details
| Department | Unisex Adult |
| Manufacturer | Flashmasters |
| Country of Origin | This item will be imported from US |
| What is in the box | 2003 Avalanche Engine Computer... For more details, please check description/product details |
| Item Weight | 2 lbs (910 grams) |
Who Should Buy?
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Replacement Needs
Ideal for users needing an ECM replacement after malfunction or failure in their 2003 Avalanche vehicle.
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VIN Programming
Perfect for those requiring a customized ECM programmed specifically to their vehicle’s VIN for optimal performance.
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DIY Mechanics
Great for DIY enthusiasts who are comfortable installing car parts and need an easy-to-install engine computer.
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Budget-Conscious
Not suitable for users looking for a low-cost alternative, as it's a specialized and potentially expensive component.
Product Description
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Customer Questions & Answers
-
Question:
What vehicles does this E.C.M. fit?
Answer: It fits the 2003 5.3/8.1L Chevrolet Avalanche (1500,2500). -
Question:
What is required after purchasing the E.C.M.?
Answer: You will need to provide your V.I.N. for programming. -
Question:
Are installation instructions included?
Answer: Yes, installation instructions are provided for both the E.C.M. setup and any needed relearn procedures.
Flashmasters Engine Computers Editorial Review
2003 Avalanche Engine Computer 12576106 ECM PCM ECU Programmed to Your Vehicle VIN offers a tailored solution for your vehicle's engine management system. Manufactured by Flashmasters, this unit weighs 2 lbs and is designed for a seamless fit with your vehicle's unique VIN programming. Customers have highlighted the effortless installation process and how the product enhances engine performance. It essentially optimizes fuel efficiency and ensures that your vehicle runs smoothly. With robust build quality, this ECM provides reliability and effectiveness that meet automotive standards.
Customer Reviews & Ratings
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Pros
- Easy installation process for users
- Optimized for enhanced engine performance
- Tailored programming to your vehicle VIN
- Robust build quality ensuring durability
- Lightweight design for easy handling
Cons
- May require professional installation for best results
Platform Trust & Buyer Confidence
JK
Jasmin
Verified buyer
“Great products and very good service: very easy and very fast international delivery.”
9 September 2026 · via Trustpilot
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Anke
Verified buyer
“Wonderful online shopping experience, smooth transaction from the start. Payment method works conveniently and delivery is unexpectedly fast and reliable. You go the extra mile for service. What makes this even more amazing, you deliver to Namibia. I will remain a happy Ubuy customer and will increase my purchases for sure! Thank you!”
10 September 2026 · via Trustpilot
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Hazel
Verified buyer
“Very easy to find the products what you need, and so fast delivery, that’s why I highly recommended to others costumers to used ubuy.”
10 September 2026 · via Trustpilot
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Opaleye
Verified buyer
“I received exactly what I ordered I was skeptical about your site because that was my first time to order. But the order came timely and neatly packaged. I was not disappointed. Thank you.”
11 September 2026 · via Trustpilot
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Adele
Verified buyer
“Easy to find and order what you want on the website. Delivery is quick to the UK”
8 September 2026 · via Trustpilot
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Important information
- Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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XCD 584
Order now and get it around Wednesday, October 07
This item is not restrict in my country.(Please click on above link if this item is not restrict in your country, So our team will review and allow.)
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PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.
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Fastest cross-border delivery
Features & Benefits
- Compatible with 2003 5.3/8.1L Chevrolet Avalanche (1500,2500).
- Each E.C.M. is personalized and programmed to your specific V.I.N.
- Includes instructions for anti-theft relearn and crankshaft variation relearn.
- Plug and Play installation for easy set up.
- Resolve check engine light issues with provided troubleshooting guidance.
- Get a reliable and normal vehicle performance with our E.C.M.
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