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Body Control Module
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2021 - 2022 Chevrolet Trailblazer Telematics Control Module (OEM)

✓ IN STOCK
$79.95

ℹ️ Product Notes

This is a used part. It is an OnStar communications control module. This module helps your car communicate. IMPORTANT: You may need to have this part reprogrammed (set up) by a mechanic so it works correctly with your vehicle.

Requires professional programming to work. Only fits vehicles with OnStar (Option UE1). Match your original part number to ensure all features work.

Original Part #(s): 84721683, 84822377, 84873689, 84979014, 85128150, 85129368, 855388
Condition: Excellent (A)
Like new, minimal to no wear
2,106 miles
Odometer reading when part was removed
SKU #
4161034-26131-195

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

⚠️ 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

  • No Connection to OnStar or Other Services: The most common sign is losing connection to services like OnStar, emergency assistance, or vehicle diagnostics.
  • Remote Key Fob Issues: Problems with locking, unlocking, or starting your car remotely can point to a failing module.
  • GPS Malfunctions: Inaccurate or non-functional GPS navigation is another potential symptom.
  • Error Messages: The vehicle's information display might show error messages related to communication or connectivity.

Testing the Telematics Control Module:

  1. Check the vehicle's battery voltage. A low battery can cause communication issues.
  2. Use a scan tool to check for diagnostic trouble codes (DTCs) related to the telematics system.
  3. Inspect the wiring and connectors for damage or corrosion.
  4. If possible, temporarily swap the module with a known good one to see if the problem is resolved.

Common Failure Causes:

  • Water Damage: Leaks or exposure to moisture can corrode the module's internal components.
  • Electrical Surges: Power surges or voltage spikes can damage the module's circuitry.
  • Vibration: Constant vibration can loosen connections and cause components to fail over time.
  • Age: Like any electronic component, the module can simply wear out over time.

Buyer's Checklist

What to look for:

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

Quality Indicators:

  • OEM Markings: Original Equipment Manufacturer (OEM) parts will have the manufacturer's logo and part number.
  • Testing: Used parts should be tested and verified to be in working condition.
  • Reputation: Buy from a reputable seller with positive reviews and a good return policy.

What's Included:

  • The Telematics Control Module itself.
  • Mounting hardware may or may not be included. Check with the seller.
  • Programming instructions may be needed and are typically NOT included.

Installation Overview

Difficulty Level: Medium

Estimated Time: 1-2 hours

Special Tools Needed:

  • Basic hand tools (sockets, wrenches, screwdrivers)
  • Scan tool for clearing diagnostic trouble codes (DTCs)
  • Possibly a programming tool to configure the new module to your vehicle (check with your mechanic)

Critical Steps and Tips:

  1. Disconnect the negative battery cable before starting.
  2. Locate the Telematics Control Module (usually under the dash or in the trunk).
  3. Disconnect the wiring connectors and remove the old module.
  4. Install the new module and reconnect the wiring connectors.
  5. Reconnect the negative battery cable.
  6. Use a scan tool to clear any DTCs.
  7. You may need to have the new module programmed to your vehicle by a qualified technician.

DIY or Professional Installation:

  • Replacing the module itself is relatively straightforward.
  • However, programming the new module often requires specialized equipment and knowledge.
  • Professional installation is recommended to ensure proper programming and functionality.

Buying Options

  • Used OEM: Original equipment from the factory, tested and inspected. Offers great value.
  • New Aftermarket: Brand new parts manufactured by third-party companies to meet OE specifications.

Used OEM:

  • Pros: Genuine factory part, lower cost than new, typically reliable.
  • Cons: May have some wear and tear, limited warranty.

New Aftermarket:

  • Pros: Brand new, readily available, often comes with a warranty.
  • Cons: Quality can vary, may not be identical to the original part.

Typical Lifespan

  • The Telematics Control Module typically lasts 7-10 years.

Factors that affect longevity:

  • Climate: Extreme temperatures and humidity can shorten the lifespan of electronic components.
  • Driving Conditions: Rough roads and constant vibration can cause premature failure.
  • Maintenance: Keeping the vehicle properly maintained can help prevent electrical problems that can damage the module.
  • Battery Condition: A healthy battery is essential for proper operation of the telematics system.

Price Ranges

  • Used OEM: $50 - $200
  • New Aftermarket: $100 - $300
  • Labor Cost: $50 - $200 (if professional installation is required)
  • Total Job Cost Estimate: $100 - $500

Vehicle-Specific Notes

  • Some vehicles may experience issues with the telematics system after a software update.
  • Check for any Technical Service Bulletins (TSBs) related to the telematics system on your specific vehicle.
  • Some owners have reported issues with OnStar connectivity after replacing the module.

Verification After Install

  • Check OnStar Functionality: Test the OnStar system by pressing the blue button or using the OnStar app.
  • Verify Remote Key Fob Operation: Test the remote lock, unlock, and start functions.
  • Check GPS Navigation: Ensure the GPS navigation system is working properly and accurately.
  • Scan for DTCs: Use a scan tool to check for any new diagnostic trouble codes (DTCs).
  • Listen for Unusual Noises: There should be no unusual noises coming from the module after installation.

FAQ

Q: Will this module need to be programmed to my vehicle? A: Yes, most likely. The module will likely need to be programmed to your vehicle's VIN by a qualified technician.

Q: What happens if I don't program the module? A: The module may not function properly, and you may experience issues with OnStar, remote key fob, and GPS.

Q: Is it difficult to install this module myself? A: The physical installation is relatively straightforward, but programming requires specialized equipment.

Q: How do I know if this module is the problem? A: Common symptoms include loss of OnStar connectivity, remote key fob issues, and GPS malfunctions. Have a mechanic diagnose the issue to be sure.

Q: What kind of warranty comes with a used OEM module? A: Warranty coverage varies depending on the seller. Check the seller's warranty policy before purchasing.

Part Specifications

OEM Part Numbers:

  • GM: 84721683, 84822377, 84873689, 84979014, 85128150, 85129368, 855388

Fits Years: 2021 2022

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