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Body Control Module
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2022 - 2025 Chevrolet Trailblazer Communication Control Module (OEM)

✓ IN STOCK
$79.95

ℹ️ Product Notes

This is a used part. It is a Communications Control Module (COMM ECU). This module controls your car's communication systems, including telematics (like OnStar, option UE1). IMPORTANT: This part may need to be reprogrammed by a mechanic after installation.

Fits models with OnStar (Option UE1) only. This module requires professional reprogramming by a mechanic or dealer after installation to function.
Condition: Excellent (A)
Like new, minimal to no wear
24,528 miles
Odometer reading when part was removed
SKU #
5040084-72671-195

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

  • Unusual electrical issues throughout the vehicle
  • Intermittent loss of communication between vehicle systems
  • Warning lights on the dashboard related to multiple systems (e.g., ABS, stability control, airbags)
  • The vehicle may not start or may stall unexpectedly
  • Malfunctioning or unresponsive infotainment system

Testing the Communication Control Module

  1. Check for power and ground: Use a multimeter to ensure the module is receiving proper power and has a good ground connection.
  2. Scan for diagnostic trouble codes (DTCs): Use a scan tool to read any stored trouble codes related to communication issues.
  3. Inspect wiring and connectors: Look for any signs of damage, corrosion, or loose connections in the wiring harness and connectors associated with the module.
  4. Perform a communication test: Use a scan tool to attempt to communicate with the module and other vehicle systems. If communication fails, it could indicate a problem with the module itself or the communication network.

Common Failure Causes

  • Water damage or corrosion
  • Electrical surges or voltage spikes
  • Physical damage from accidents or impacts
  • Overheating due to prolonged use or poor ventilation
  • Component failure due to age and wear

Buyer's Checklist

What to Look For

  • Compatibility with your vehicle's year, make, and model
  • Condition of the part (if buying used)
  • Warranty or return policy offered by the seller
  • Seller reputation and reviews

Quality Indicators

FeatureUsed OEMNew Aftermarket
OriginOriginal equipment manufacturer (OEM) partManufactured by a third-party company
TestingTypically tested and inspected to ensure functionalityShould meet or exceed OEM specifications
WearMay show signs of wear and tear but should be in good working conditionBrand new, no prior use
ReliabilityGenerally reliable due to being an OEM partReliability can vary depending on the manufacturer
PriceTypically less expensive than new aftermarket optionsCan be comparable in price to used OEM or slightly more expensive depending on the brand and quality

What's Included

  • The Communication Control Module itself
  • Mounting hardware may or may not be included (check with the seller)
  • Installation instructions are typically not included (professional installation recommended)

Installation Overview

Difficulty Level and Estimated Time

  • Difficulty: Medium to High
  • Estimated Time: 1-3 hours (depending on experience and vehicle access)

Special Tools Needed

  • Scan tool for clearing codes and potentially reprogramming
  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Multimeter for electrical testing

Critical Steps and Tips

  1. Disconnect the negative battery cable: This is crucial to prevent electrical shorts during installation.
  2. Locate the Communication Control Module: Refer to your vehicle's service manual for the exact location.
  3. Disconnect the wiring harness: Carefully disconnect the wiring harness from the old module.
  4. Remove the old module: Unbolt or unclip the old module from its mounting location.
  5. Install the new module: Install the new module in the same location and secure it with the mounting hardware.
  6. Connect the wiring harness: Reconnect the wiring harness to the new module.
  7. Reconnect the negative battery cable: Reconnect the negative battery cable.
  8. Program or flash the module: The new module may need to be programmed or flashed to your vehicle's computer system using a scan tool.
  9. Clear any diagnostic trouble codes: Use a scan tool to clear any trouble codes that may have been generated during the installation process.

DIY or Professional Installation?

  • Professional installation is highly recommended due to the complexity of the system and the need for specialized tools and programming. Incorrect installation or programming can cause further damage to the vehicle's electrical system.

Buying Options

Used OEM

  • Description: Genuine factory parts that were originally installed in the vehicle.
  • Pros: Best value, tested and inspected, genuine factory parts, lower price.
  • Cons: May have some wear and tear.

New Aftermarket

  • Description: Brand new parts manufactured by third-party companies to meet or exceed OE specifications.
  • Pros: Brand new, no prior use.
  • Cons: Quality can vary depending on the manufacturer.

Typical Lifespan

How Long This Part Normally Lasts

  • The Communication Control Module typically lasts for 8-12 years or 100,000-150,000 miles.

Factors That Affect Longevity

  • Environmental conditions (temperature, humidity)
  • Driving habits (frequent short trips vs. long highway drives)
  • Maintenance history (regular inspections and repairs)
  • Electrical system health (proper battery voltage, no excessive loads)

Price Ranges

Budget vs. Mid-Range vs. Premium

  • Used OEM: $150 - $300
  • New Aftermarket: $200 - $400

Labor Cost Considerations

  • Labor costs for installation can range from $150 to $300, depending on the shop's hourly rate and the complexity of the job.

Total Job Cost Estimates

  • Used OEM + Labor: $300 - $600
  • New Aftermarket + Labor: $350 - $700

Vehicle-Specific Notes

Known Issues

  • Some vehicles have known issues with water intrusion affecting the Communication Control Module, leading to corrosion and failure.
  • Software glitches can sometimes cause communication problems that may be misdiagnosed as a hardware failure.

TSBs and Common Complaints

  • Check for any Technical Service Bulletins (TSBs) related to communication issues for your specific vehicle model. Common complaints include intermittent loss of communication, warning lights, and infotainment system malfunctions.

Verification After Install

How to Confirm Proper Operation

  • Use a scan tool to check for any stored trouble codes related to communication issues.
  • Verify that all vehicle systems are communicating properly and functioning as expected.
  • Test the infotainment system to ensure it is working correctly.

What to Look/Listen For

  • No warning lights on the dashboard related to communication or system malfunctions.
  • Smooth and consistent operation of all vehicle systems.
  • Proper functioning of the infotainment system, including audio, navigation, and connectivity features.
  • No unusual noises or electrical issues.

FAQ

Q: How do I know if the Communication Control Module is the problem and not something else?
A: A scan tool can help identify specific trouble codes related to the module. Also, check for any obvious signs of damage or corrosion. It's best to have a professional diagnose the issue to rule out other potential causes.

Q: Will I need to program the new Communication Control Module?
A: Yes, in most cases, the new module will need to be programmed or flashed to your vehicle's computer system to ensure proper communication and functionality. This typically requires a specialized scan tool and software.

Q: Can I install the Communication Control Module myself?
A: While it is possible to install the module yourself, professional installation is highly recommended due to the complexity of the system and the need for specialized tools and programming.

Q: What is the difference between a used OEM and a new aftermarket Communication Control Module?
A: A used OEM module is a genuine factory part that was originally installed in the vehicle. A new aftermarket module is manufactured by a third-party company to meet or exceed OE specifications. OEM parts are generally considered more reliable but may have some wear and tear. Aftermarket parts are brand new but quality can vary depending on the manufacturer.

Q: What kind of warranty can I expect on a used Communication Control Module?
A: Warranty coverage on used parts varies depending on the seller. Some sellers offer a limited warranty of 30-90 days, while others may not offer any warranty at all. Be sure to check the seller's warranty policy before making a purchase.

Part Specifications

OEM Part Numbers:

  • GM: 84788547, 84841016, 84967425, 84970854, 85123532, 85127982, 85526282, 85542065, 85642938, 86522340, 86579859, 86579863, 86804753, 86804757, 87814676

Fits Years: 2022 2023 2024 2025

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