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Body Control Module

2021 - 2025 Chevrolet Trailblazer Body Control Module - Front Rear (OEM)

✓ IN STOCK
$99.95

⚠️ 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 has no damage. This body control module is located below the center console. It includes good bags for the front and rear seats. This module may need to be reprogrammed to work with your vehicle.
Condition: Excellent (A)
Like new, minimal to no wear
34,000 miles
Odometer reading when part was removed
SKU #
579229401-47421-195

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 2021-2025 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
ACTIV SUV 2021 - 2025 L3 1.3L Turbo AWD/FWD | Automatic & Automatic CVT
L SUV 2021 - 2022 L3 1.2L Turbo FWD | Automatic CVT
LS SUV 2021 - 2024 L3 1.2L Turbo AWD/FWD | Automatic & Automatic CVT
LS SUV 2021 - 2025 L3 1.3L Turbo AWD/FWD | Automatic & Automatic CVT
LT SUV 2021 - 2024 L3 1.2L Turbo AWD/FWD | Automatic & Automatic CVT
LT SUV 2021 - 2025 L3 1.3L Turbo AWD/FWD | Automatic & Automatic CVT
RS SUV 2021 - 2025 L3 1.3L Turbo AWD/FWD | Automatic & Automatic CVT
LS SUV 2025 L3 1.2L FLEX Turbo AWD/FWD | Automatic & Automatic CVT
LT SUV 2025 L3 1.2L FLEX Turbo AWD/FWD | Automatic & Automatic CVT
2023

⚠️ 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 Body Control Module (BCM)

  • Erratic electrical behavior (lights flickering, windows not working correctly)
  • Battery drain when the vehicle is off
  • Issues with door locks, power windows, or security system
  • Problems with interior or exterior lighting
  • Malfunctions with the windshield wipers or other accessories
  • The vehicle may not start

How to Test If the BCM Is the Problem

  1. Visual Inspection: Check the BCM and its connectors for any signs of damage, like corrosion or loose wires.
  2. Scan Tool Diagnosis: Use a scan tool to check for diagnostic trouble codes (DTCs) related to the BCM or other electrical systems. These codes can help pinpoint the source of the problem.
  3. Component Testing: Use a multimeter to test the BCM's inputs and outputs. This will determine if the BCM is sending and receiving signals correctly.
  4. Wiring Inspection: Check the wiring harness for any breaks, shorts, or corrosion. Damaged wiring can cause the same symptoms as a faulty BCM.
  5. Consult a Professional: If you're unsure about any of these steps, take your vehicle to a qualified mechanic for diagnosis.

Common Failure Causes

  • Electrical surges or spikes
  • Water damage or corrosion
  • Physical damage from accidents or impacts
  • Overheating
  • Normal wear and tear over time

Buyer's Checklist

What to Look For When Buying

  • Compatibility: Make sure the BCM is designed for your specific year, make, and model vehicle.
  • Condition: If buying a used BCM, check for any signs of damage or corrosion.
  • Warranty: Look for a warranty to protect against defects or premature failure.

Quality Indicators

  • OEM Part: OEM (Original Equipment Manufacturer) parts are made by the same manufacturer as the original part in your vehicle.
  • Testing: If buying a used BCM, make sure it has been tested and is confirmed to be working.
  • Reputation: Buy from a reputable seller with good reviews.

What's Typically Included

  • The Body Control Module itself
  • Sometimes, installation instructions or diagrams are included.

Installation Overview

Difficulty Level and Estimated Time

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

Special Tools Needed

  • Socket set
  • Screwdrivers
  • Scan tool (for programming)
  • Multimeter (optional, for testing)

Critical Steps and Tips

  1. Disconnect the Battery: Always disconnect the negative battery cable before working on electrical components.
  2. Locate the BCM: The BCM is usually located under the dashboard or in the center console. Refer to your vehicle's repair manual for the exact location.
  3. Disconnect Connectors: Carefully disconnect all electrical connectors from the BCM.
  4. Remove the Old BCM: Remove any screws or fasteners holding the BCM in place.
  5. Install the New BCM: Install the new BCM in the reverse order of removal.
  6. Reconnect Connectors: Reconnect all electrical connectors to the BCM.
  7. Reconnect the Battery: Reconnect the negative battery cable.
  8. Programming: The new BCM may need to be programmed to your vehicle using a scan tool.
  9. Test: Test all electrical functions to make sure the new BCM is working properly.

DIY vs. Professional Installation

  • DIY is possible if you have experience working on automotive electrical systems and have access to a scan tool for programming. However, professional installation is recommended if you are not comfortable working on electrical systems or do not have the necessary tools.

Buying Options

Compare: Used OEM, New Aftermarket

FeatureUsed OEMNew Aftermarket
PriceTypically the least expensive option.Usually more expensive than used OEM.
QualityGenuine factory part, often tested and inspected.New part manufactured by a third party, built to meet or exceed OE specifications.
ReliabilityCan be very reliable if properly tested and inspected.Reliability can vary depending on the manufacturer.
WarrantyMay come with a limited warranty.Typically comes with a warranty.
RecommendationGreat value for budget-conscious buyers who want a genuine factory part.A good choice for buyers who want a brand-new part and don't mind paying a bit more.

Used OEM

  • Best value option.
  • Genuine factory parts.
  • Tested and inspected.
  • Significantly lower prices than new.

New Aftermarket

  • Brand new parts.
  • Built to OE specifications.
  • Manufactured by third-party companies.

Typical Lifespan

How Long This Part Normally Lasts

  • A BCM can last for the entire lifespan of the vehicle, which can be 10-15 years or more.

Factors That Affect Longevity

  • Environmental conditions (humidity, temperature)
  • Electrical surges or spikes
  • Water damage
  • Quality of the original part

Price Ranges

Budget vs. Mid-Range vs. Premium Options

  • Used OEM: $50 - $150
  • New Aftermarket: $100 - $300

Labor Cost Considerations

  • Labor costs can range from $100 to $300, depending on the mechanic's hourly rate and the complexity of the installation.

Total Job Cost Estimates

  • Used OEM + Labor: $150 - $450
  • New Aftermarket + Labor: $200 - $600

Vehicle-Specific Notes

Known Issues

  • Some vehicles may experience issues with the BCM causing intermittent electrical problems, such as power windows not working or the security system malfunctioning.
  • Check for any Technical Service Bulletins (TSBs) related to the BCM on your specific vehicle. These bulletins can provide information about known issues and recommended solutions.

Verification After Install

How to Confirm Proper Operation

  • Use a scan tool to check for any diagnostic trouble codes (DTCs).
  • Test all electrical functions, such as power windows, door locks, lights, and wipers.

What to Look/Listen For

  • Make sure all electrical functions are working smoothly and without any issues.
  • Listen for any unusual noises or clicking sounds from the BCM.
  • Verify that the security system is functioning properly.

FAQ

Q: Will this BCM need to be programmed to my vehicle?
A: Yes, in most cases, a new BCM will need to be programmed to your vehicle using a scan tool. This is to ensure that the BCM is compatible with your vehicle's other systems.

Q: What happens if I don't program the BCM?
A: If you don't program the BCM, some or all of your vehicle's electrical functions may not work properly.

Q: How do I know if this BCM is compatible with my vehicle?
A: Check the compatibility information to make sure it's designed for your specific year, make, and model.

Q: What is the difference between a used OEM BCM and a new aftermarket BCM?
A: A used OEM BCM is a genuine factory part that has been previously used, while a new aftermarket BCM is a brand new part manufactured by a third-party company.

Q: Is it difficult to install a BCM myself?
A: Installing a BCM can be challenging, especially if you don't have experience working on automotive electrical systems. Professional installation is recommended if you are not comfortable with this type of work.

Part Specifications

OEM Part Numbers:

  • Other: 13518593, 13518626, 13518628, 13532662, 13534192, 13535989, 13535993, 844, 84469210

Fits Years: 2021 2022 2023 2024 2025

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