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Engine Control Module (ECM)
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2006 Chevrolet Trailblazer Engine Control Module (ECM) (OEM)

✓ IN STOCK
$78.95

⚠️ ELECTRONIC MODULE NOTICE

This module may require programming to your vehicle by a dealer or qualified technician with professional diagnostic equipment.

  • Ships in a sealed inspection bag for visual inspection
  • Returns not accepted if inspection bag has been opened
  • "Needs programming" is not grounds for return
  • If told the module "won't program," contact us before returning
  • Defective units replaced ONLY ONCE, under warranty

ℹ️ Product Notes

This is a used part. It is the main engine computer (also called the Engine Control Module or ECM). This module worked well when removed. It fits vehicles with 3.5L, 3.9L, and 6.0L engines. This part must be programmed by a dealership or qualified mechanic before it will work in your vehicle.

Must be programmed by a dealer or shop to work. Match your original part number. Fits 3.5L, 3.9L, and 6.0L engines only.

Original Part #(s): 12589297, 12597121, 12603892, 12614085, 19210738
Condition: Excellent (A)
Like new, minimal to no wear
116,412 miles
Odometer reading when part was removed
See Other Chevrolet Trailblazer Engine Control Module (ECM)s
SKU #
0687425-99300-095

Why Buy Used OEM Parts?

✓ Quality-Verified: Every used OEM part we sell has been professionally inspected and tested to ensure it meets our quality standards. While it may show some cosmetic wear from previous use, it's fully functional and ready to install.

✓ Original Equipment: This is a genuine OEM (Original Equipment Manufacturer) part - the exact same part that came with your vehicle from the factory. It's designed specifically for your make and model, ensuring perfect fitment and performance.

✓ Works Like New: Despite some visual wear, this part will perform just as well as a brand new one. The internal components and functionality are intact, giving you the same reliability you'd expect from OEM quality.

✓ Significant Savings: Save 50-80% compared to buying new! Used OEM parts offer exceptional value - you get factory quality at a fraction of the cost. It's the smart choice for budget-conscious vehicle owners who won't compromise on quality.

✓ Risk-Free Purchase: We stand behind our used parts with a generous 6-month warranty, 30-day returns, and 100% money-back guarantee. If it doesn't work out for any reason, simply return it for a full refund. You have nothing to lose!

🛡️ 30-Day Returns + 6-Month Warranty - Buy with Confidence!

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Vehicle Fitment Guide

This part fits the following vehicles:

Chevrolet
Trailblazer 2006 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
SS SUV 2006 V8 6.0L AWD/RWD | Automatic | Fits 6.0L engine

⚠️ Important: Please verify your vehicle's year, make, model, and specifications before ordering. If you're unsure about fitment, contact our customer service team for assistance.

Policies

Shipping & Handling

  • Standard shipping: 3-7 business days via UPS Ground
  • Parts are carefully packaged to prevent damage during transit

Returns (30 Days)

We accept returns within 30 days of delivery for this part.

  • Defective parts: We will replace the part or issue a refund at our discretion
  • Electronic parts: Must be returned with the sealed inspection bag unopened. The clear bag allows full visual inspection before opening. Once opened, electronic parts can only be exchanged for a replacement if defective — no refunds
  • Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
  • Return shipping: We cover return shipping as part of our 100% money-back guarantee
  • Parts must be returned in original packaging and unmodified condition
  • Poorly packaged returns that arrive damaged will not be credited

6-Month Warranty

All used parts include a 6-month warranty from the date of purchase.

  • If your part fails within 6 months, we will send a replacement
  • Refunds are only issued if we cannot provide a suitable replacement
  • Warranty covers defects — not installation errors, misuse, or damage after installation

Note: Warranty is for replacement, not refund. A part failing on day 80? We'll replace it. But the return window for refunds is 30 days.

Damaged in Shipping?

If your part arrives damaged:

  • Stop immediately — do not install the part
  • Keep all original packaging and boxes
  • Take clear photos of the damage and packaging
  • Contact us within 48 hours of delivery

We will handle the carrier claim. You are not responsible for shipping damage — we just need your help documenting it.

Order Cancellation

Orders can be cancelled before shipment for a full refund. Once shipped, cancellations follow our return policy.

Symptoms & Diagnosis

Warning Signs Your Engine Control Module (ECM) is Failing

  • Your car won't start or stalls frequently.
  • The check engine light is on and won't go off.
  • You experience poor fuel economy.
  • The engine misfires or runs rough.
  • You notice shifting problems (automatic transmissions).
  • Your car fails an emissions test.

How to Test if This Part is the Problem

Testing the ECM requires specialized tools and knowledge. A mechanic will typically:

  1. Check for any trouble codes stored in the ECM's memory using a scan tool.
  2. Inspect wiring and connections to the ECM for damage or corrosion.
  3. Test sensors and other components that send signals to the ECM.
  4. If other components are ruled out, the ECM itself may be the problem.

Common Failure Causes for This Part

  • Overheating due to engine problems or poor ventilation.
  • Electrical surges or shorts in the vehicle's wiring.
  • Water damage from leaks or flooding.
  • Vibration and age can cause internal components to fail.

Buyer's Checklist

What to Look for When Buying This Part

  • Make sure the part is compatible with your vehicle's year, make, and model.
  • Check the part's condition (if buying used). Look for any signs of damage or corrosion.
  • Ask about any warranty or guarantee offered by the seller.

Quality Indicators for the Available Options

| Feature | Used OEM be sure the seller has tested the part.

  • Used OEM: Original equipment from the vehicle manufacturer. Offers the same performance and reliability as the original part.
  • New Aftermarket: Made by a third-party manufacturer. Can be a good alternative to OEM, but quality can vary.

What's Typically Included With the Part

  • The Engine Control Module (ECM) itself.
  • Sometimes, mounting hardware may be included (check with the seller).

Installation Overview

Difficulty Level and Estimated Time

  • Difficulty: Medium to High
  • Estimated Time: 1-3 hours

Special Tools Needed (If Any)

  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Scan tool for reading and clearing trouble codes
  • Possibly a multimeter for testing electrical connections

Critical Steps and Tips

  1. Disconnect the negative battery cable before starting any work.
  2. Locate the ECM (usually under the dashboard or in the engine compartment).
  3. Disconnect the wiring harness connectors from the ECM.
  4. Remove the old ECM and install the new one.
  5. Reconnect the wiring harness connectors.
  6. Reconnect the negative battery cable.
  7. Use a scan tool to clear any trouble codes and program the ECM if necessary.

Whether DIY is Recommended or Professional Installation is Better

  • Professional installation is recommended, especially if programming is required. If you are comfortable with electrical work and using a scan tool, you may be able to do it yourself.

Buying Options

Compare: Used OEM, New Aftermarket

| Feature | Used OEM help.

  • Used OEM: Offers a good balance of price and reliability. These parts are genuine factory parts that have been tested and inspected.
  • New Aftermarket: Provides a brand-new part built to OE specifications.

Typical Lifespan

  • The ECM can last for the entire lifespan of the vehicle, often 10-15 years or more.

Factors That Affect Longevity

  • Proper engine maintenance
  • Avoiding electrical problems
  • Protecting the ECM from water damage and extreme temperatures

Price Ranges

  • Used OEM: $150 - $400
  • New Aftermarket: $200 - $500
  • Labor Cost: $100 - $300 (if professional installation is chosen)
  • Total Job Cost: $250 - $800 (depending on the option chosen and labor costs)

Vehicle-Specific Notes

Some vehicles in this range (2006-2008 Chevrolet, GMC, Hummer, Pontiac, & Saturn) have known issues with their electrical systems. Check for any Technical Service Bulletins (TSBs) related to ECM failures or electrical problems in your specific vehicle model. Some common complaints include intermittent stalling, misfires, and difficulty starting.

Verification After Install

How to Confirm Proper Operation

  • Start the engine and let it idle for a few minutes.
  • Check for any warning lights on the dashboard.
  • Use a scan tool to check for any new trouble codes.
  • Take the vehicle for a test drive to see if it runs smoothly.

What to Look/Listen for to Verify It's Working Correctly

  • The engine should start easily and idle smoothly.
  • There should be no misfires or unusual noises.
  • The transmission should shift smoothly (automatic transmissions).
  • The check engine light should be off.

FAQ

Q: Will this ECM need to be programmed?
A: In many cases, yes. Some ECMs require programming to match your vehicle's specific VIN and options. Check with a mechanic or the seller to confirm if programming is needed.

Q: How do I know if my ECM is really bad?
A: Have a mechanic diagnose the problem. They can use a scan tool and other tests to determine if the ECM is the cause of your car's issues.

Q: What happens if I install an ECM that isn't compatible with my car?
A: The engine may not start, or it may run poorly. It could also damage other components in your car. It's important to ensure the ECM is compatible with your vehicle.

Q: Is it hard to replace an ECM myself?
A: It can be challenging, especially if programming is required. Professional installation is recommended if you're not comfortable with electrical work and using a scan tool.

Q: What kind of warranty comes with a used ECM?
A: Warranty coverage varies depending on the seller. Ask about the warranty before you buy. Many sellers offer a limited warranty of 30-90 days.

Part Specifications

OEM Part Numbers:

  • GM: 12589297, 12597121, 12603892, 19210738
  • Other: 12614085

Fits Years: 2006

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