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Engine Control Module (ECM)
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2009 Chevrolet Trailblazer Engine Control Module (ECM) (OEM)

Only 1 left in stock
$87.95

⚠️ 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 an Engine Control Module (ECM), which is the main computer for your engine. This module must be programmed by a car dealer or certified mechanic after installation to make sure your car runs correctly.
Condition: Excellent (A)
Like new, minimal to no wear
126,523 miles
Odometer reading when part was removed
See Other Chevrolet Trailblazer Engine Control Module (ECM)s
SKU #
7096935-63510-095

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 2009 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
LT SUV 2009 L6 4.2L RWD/4WD | Automatic
SS SUV 2009 V8 6.0L AWD/RWD | Automatic

⚠️ 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 of a Failing Engine Control Module (ECM)

  • Check Engine Light is on
  • Engine stalls or hesitates
  • Poor fuel economy
  • Engine misfires
  • Difficulty starting the vehicle
  • Transmission shifting problems
  • Failed emissions test

Testing the ECM

Is it the ECM or something else? Here's how to check:

  1. Visual Inspection: Look for any obvious damage to the ECM, like corrosion or burnt components.
  2. Scan for Codes: Use an OBD-II scanner to check for diagnostic trouble codes (DTCs) related to the ECM. Note: other faulty components can trigger ECM-related codes.
  3. Check Power and Ground: Make sure the ECM is receiving proper power and ground. A multimeter can help with this.
  4. Inspect Wiring Harness: Check the wiring harness and connectors for any damage or loose connections.
  5. Component Testing: Other components like sensors and actuators should be tested before condemning the ECM.

Common Failure Causes

  • Overheating
  • Voltage spikes
  • Water damage
  • Vibration
  • Age and wear

Buyer's Checklist

What to Look For

  • Correct Application: Make sure the ECM is designed for your specific year, make, and model vehicle.
  • Condition: If buying a used ECM, check for any signs of damage or corrosion.
  • Warranty: Look for a warranty to protect your investment.
  • Reputation: Buy from a reputable seller with good reviews.

Quality Indicators

FeatureUsed OEMNew Aftermarket
SourceOriginal vehicleThird-party manufacturer
TestingTested and inspectedBrand new
ReliabilityGenerally reliable, factory calibratedVaries by manufacturer, may need programming
PriceLowerHigher

What's Included

  • The ECM unit itself.
  • Sometimes, basic installation instructions are included.
  • Note: Programming may be required (check with seller).

Installation Overview

Difficulty Level and Estimated Time

  • Difficulty: Moderate
  • Estimated Time: 1-3 hours

Special Tools Needed

  • Basic hand tools (sockets, wrenches, screwdrivers)
  • OBD-II scanner
  • Multimeter (optional, but recommended for troubleshooting)
  • Anti-static wrist strap (recommended to prevent damage to the ECM)

Critical Steps and Tips

  1. Disconnect the Battery: Always disconnect the negative battery cable before working on electrical components.
  2. Locate the ECM: The ECM is typically located under the hood, under the dashboard, or under a seat. Consult your vehicle's repair manual for the exact location.
  3. Disconnect the Connectors: Carefully disconnect the wiring harness connectors from the ECM.
  4. Remove the Old ECM: Remove the mounting hardware and remove the old ECM.
  5. Install the New ECM: Install the new ECM and secure it with the mounting hardware.
  6. Reconnect the Connectors: Carefully reconnect the wiring harness connectors to the ECM.
  7. Reconnect the Battery: Reconnect the negative battery cable.
  8. Programming: The ECM may need to be programmed to your vehicle. This may require a trip to a qualified mechanic or dealership.

DIY or Professional Installation?

  • DIY is possible if you have experience working on cars and are comfortable with electrical systems.
  • Professional installation is recommended if you are not comfortable working on cars or if the ECM needs to be programmed.

Buying Options

Compare: Used OEM, New Aftermarket

FeatureUsed OEMNew Aftermarket
PriceTypically the lowest price option.Generally more expensive than used OEM.
ReliabilityGenuine factory part, tested and inspected.Reliability can vary depending on the manufacturer.
AvailabilityAvailability may be limited.Usually readily available.
ProgrammingMay require programming, depending on the vehicle and the specific ECM.May require programming, depending on the vehicle and the specific ECM.
WarrantyUsually comes with a limited warranty.Usually comes with a warranty, but terms vary.

Used OEM

Used OEM ECMs offer excellent value. These are genuine factory parts that have been tested and inspected to ensure they are in good working condition. They are available at significantly lower prices than new parts.

New Aftermarket

New aftermarket ECMs are brand new parts manufactured by third-party companies. These parts are built to meet or exceed OE specifications.

Typical Lifespan

How Long This Part Normally Lasts

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

Factors That Affect Longevity

  • Environmental conditions (heat, moisture)
  • Electrical problems in the vehicle
  • Quality of the ECM itself
  • Proper installation and maintenance

Price Ranges

Budget vs Mid-Range vs Premium Options

  • Used OEM: $100 - $300
  • New Aftermarket: $250 - $500

Labor Cost Considerations

  • Professional installation can add $100 - $300 to the total cost, depending on the shop and the complexity of the job.
  • Programming may add an additional $50-$150.

Total Job Cost Estimates

  • DIY (Used OEM): $100 - $300 (plus programming if needed)
  • Professional Installation (Used OEM): $300 - $600 (including labor and potential programming)
  • DIY (New Aftermarket): $250 - $500 (plus programming if needed)
  • Professional Installation (New Aftermarket): $450 - $800 (including labor and potential programming)

Vehicle-Specific Notes

Known Issues

Some 2009-2012 Buick, Cadillac, Chevrolet, GMC, Hummer, and Saab vehicles with specific engine configurations have experienced issues with ECMs related to fuel management and emissions control.

TSBs and Common Complaints

Check for any Technical Service Bulletins (TSBs) related to the ECM on your specific vehicle. Common complaints include:

  • Erratic engine performance
  • Difficulty passing emissions tests
  • False trouble codes

Verification After Install

How to Confirm Proper Operation

  • Start the engine and let it idle.
  • Check for any unusual noises or vibrations.
  • Use an OBD-II scanner to check for any new trouble codes.
  • Take the vehicle for a test drive.

What to Look/Listen For

  • Smooth engine operation
  • Proper shifting (if applicable)
  • No warning lights on the dashboard
  • Normal fuel economy

FAQ

Q: Will this ECM need to be programmed?
A: It depends. Some ECMs are plug-and-play, while others require programming to match your vehicle's VIN and options. Check with the seller or a qualified mechanic to confirm.

Q: How do I know if my ECM is really bad?
A: Have a mechanic diagnose the problem. They can test the ECM and other components to determine the root cause of the issue.

Q: What happens if I install the wrong ECM?
A: Installing the wrong ECM can cause serious damage to your vehicle. Make sure the ECM is designed for your specific year, make, and model.

Q: Can I program the ECM myself?
A: It is possible to program an ECM yourself, but it requires specialized equipment and knowledge. It is generally recommended to have a qualified mechanic or dealership program the ECM.

Q: What is the warranty on a used ECM?
A: Warranty terms vary depending on the seller. Check the warranty information before you buy.

Part Specifications

OEM Part Numbers:

  • Other: 12625453, 12630464, 12636015, 12636659

Fits Years: 2009

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