Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
Welcome to 603 Auto Salvage, We Sell Quality Used Auto Parts at Affordable prices.
$75.00
Used engine control module (ECM) for 2004 Chevrolet Trailblazer. This electronic control unit manages engine functions and has been inspected for proper operation. Interchange #7122, Stock #TRLEBX.
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This engine control module was removed from a 2004 Chevrolet Trailblazer and has been professionally inspected for proper operation. The ECM is currently on our shelf and ready to ship immediately. This OEM unit carries part number 12574976 and controls critical engine management functions.
The engine control module is the brain of your vehicle’s engine management system, controlling fuel injection, ignition timing, emissions systems, and other critical functions. When an ECM fails, symptoms include poor fuel economy, rough idling, stalling, or the vehicle not starting at all. A faulty ECM often triggers check engine lights and can cause drivability issues that affect your vehicle’s performance and reliability.
603 Auto Salvage maintains over 50,000 quality used parts in stock from more than 1,100 vehicles. Our experienced team can help you find the right engine control module for your Chevrolet. Contact us to verify compatibility and discuss programming requirements, or browse our extensive online inventory for additional Chevrolet parts. 50,000+ parts in stock from over 1,100 vehicles. Contact us or call (603) 392-7313 for anything you need.
| Part | Engine Control Module (ECM) – Electronic Control Unit |
| Interchange # | 7122 |
| OEM Part Number | 12574976 |
| Side | N/A |
| Part Grade | X — Inspected electronic control unit, tested and ready to ship |
| Warranty | 90-Day Warranty (Standard warranty for tested electronic components) |
| Type | Used OEM |
| Year / Make / Model | 2004 CHEVROLET TRLBLZ |
| VIN | N/A |
| Vehicle Stock # | TRLEBX |
Every part at 603 Auto Salvage is inspected before listing. Here is what was verified on this Engine Control Module (ECM) – Electronic Control Unit:
| ✅ Electronic connections | All connector pins clean and undamaged |
| ✅ Housing integrity | No cracks or physical damage to ECM case |
| ✅ Circuit board condition | Internal components visually inspected |
| ✅ Part number verification | OEM part number 12574976 confirmed |
Based on interchange #7122, this part fits the following vehicles. Always confirm fitment with your mechanic before purchasing.
| Year(s) | Make | Model | Notes |
|---|---|---|---|
| 2004 | Chevrolet | Trailblazer | Contact us for full compatibility list and programming requirements |
Questions? Need a shipping quote? Call us now:
603 Auto Salvage | 233 Main St, Plaistow, NH 03865
Mon–Fri 8am–4:30pm | Sat 8am–2pm | Sun Closed
Yes, engine control modules typically require programming to match your vehicle’s VIN and specifications. Contact your dealer or qualified technician for programming services after installation.
Common symptoms include check engine lights, poor fuel economy, rough idling, stalling, hard starting, or complete no-start conditions. Professional diagnosis is recommended to confirm ECM failure.
This unit carries OEM part number 12574976. Contact us to verify this matches your specific vehicle’s requirements as ECM part numbers can vary by engine and options.
While physical installation is straightforward, ECMs require specialized programming equipment and software. Professional installation and programming is strongly recommended for proper operation.
The interchange number helps identify compatible ECMs across different model years and applications. Contact us to verify if this interchange matches your specific vehicle needs.
Looking for this part by number? Here are the reference numbers:
| GM Part Number | 12574976 |
| Interchange | 7122 |
| Stock Number | TRLEBX |
| Source | Price Range | Warranty | Notes |
|---|---|---|---|
| Dealer (New OEM) | $400-600 | 1 year | Brand new, longest wait time |
| Aftermarket | $250-400 | Varies | Non-OEM fitment, quality varies |
| Other Salvage Yards | $100-150 | 30–60 days | Varies in quality and testing |
| 603 Auto Salvage | $75 | 90-Day Warranty | Tested, Grade X, ships in 24hrs |
🔍 Free Fitment Check
Call us with your VIN and we will verify compatibility for free. No obligation, no pressure — just answers.
Our parts specialists check interchange data in real-time
This part ships via FedEx Ground. Prices are estimates — call for an exact quote to your zip code.
| Region | Estimated Cost | Transit Time |
|---|---|---|
| New England (NH, MA, ME, VT, CT, RI) | $15 – $30 | 1–3 business days |
| Northeast (NY, NJ, PA, MD, VA) | $20 – $40 | 2–4 business days |
| Southeast (FL, GA, NC, SC, TN) | $25 – $45 | 3–5 business days |
| Midwest (OH, MI, IL, IN, WI, MN) | $30 – $50 | 3–5 business days |
| Southwest (TX, AZ, NM, OK) | $35 – $55 | 4–6 business days |
| West Coast (CA, OR, WA) | $40 – $65 | 5–7 business days |
Local pickup is always free. Free delivery within 30 miles of Plaistow, NH.
Ready to order? Call (603) 392-7313 or add to cart above. We are here to help.
| Weight | 3 lbs |
|---|
RatingGreat service! The best price and condition for the Porsche Cayenne parts needed to finish the job. Radiator core support and headlight fit perfectly!
Drove from new york, Julie was a sweetheart asked questions to make sure that my ECU was the proper part number and was compatible with my manual Accord, price was phenomenal I highly recommend them for any parts your car may need. Definitely the best salvage yard around
Great experience at 603 Auto Salvage! ⭐️ The owner and employee were both extremely helpful and easy to work with. I was able to find everything I needed in one stop — about seven different items — which saved me a lot of time and hassle. Good selection, fair pricing, and friendly service. Definitely recommend checking them out if you're looking for parts. I’ll be back again! 👍🔧🚗
I had a great experience with 603 Auto Salvage Inc. The team was very helpful and quickly found the exact part I needed. They kept me informed and made the pickup process easy. The price was very fair, and the service was excellent. I would definitely recommend them and will use them again if I need parts in the future.
Excellent support, she helped me with my order service was fast and exactly what I needed.Very Professional.
The customer service at 603 was great. They found the part I needed very quickly and promptly notified me when it was ready to be picked up. There wasn’t any other place in the area that had what I needed. The price was very good also. I will be using them again for sure.
I had a great experience. They didn’t just look up the part I needed they took the time to explain how to install it and made sure I understood everything. I even received a call back, which I really appreciated. Everyone I spoke with was friendly and patient, and I never felt brushed off. I truly felt taken care of. Highly recommend if you want knowledgeable people who actually care about helping you. Kristy Thanks Guys!
Drove from Connecticut to get here. Had parts for a relatively rare car that dozens of other places didn't have. I got a hood, fender and bumper cover that were in near mint condition for a fifteen year old car. They pulled all the parts for me and had everything ready within an hour. Very reasonably priced. Highly recommend
Exceptional service, large selection of parts, will come back if more Audi parts are needed. A++
They are Very Quick and Very Affordable for their parts. Went in there for my girlfriend, she needed an alternator, they had it ready at the desk by the time i got there. Thanks guys!
Awesome place I drove over 2hrs they gave me a super great deal!!! Super Friendly sent me a bunch of pictures.I would Definitely do business with them again!!!!!
Confianza y buen servicio ala comunidad ispana
If you’re not getting your car parts here then what are you doing?!! The best reliable car place in New Hampshire❤️ 100000% recommended
Great service! Picked up a door for my car and it was in good condition.
Purchased a wheel they had it ready the next day , not damaged, and ready for pickup. Julie was helpful at the front desk giving a specific time frame and held to it.
Super Friendly, Easy to work with, Accurate inventory, and great prices
Great place, have a wide selection of cars. They definitely will have what you need if not they will help a ton!
Great customer service and great prices!!! I purchased an engine that was in excellent condition and could not beat the price. The woman at the desk, Julie, was very helpful and knowledgeable. They put the engine on the back of the truck for me And secured it as well. I highly recommend this place. I will be coming here for any parts I need.
Eldy was awesome he helped load my car door and was informative. The lady Julie at the counter was super helpful and got back to me fast regarding the replacement door I needed. Highly recommended
Bought a seat belt from here and a seat great service very polite will recommend
603 Auto salvage never fails at giving me the best customer service at a fair price easy to work with and very professional all around
I urgently needed a set of Hyundai wheels for a used car delivery and quick. Julie and her crew saved the day. She was able to check inventory, confirm she had what I needed and get them ready for pick up in amazingly short order. Autoshop Services will be a regular customer. Thank You. .
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