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Body Control Module
This photo shows a similar part, not the exact one you'll receive. Since each used part has its own wear, yours may look slightly different.

2004 - 2005 Chevrolet Trailblazer Telematics Control Module (OEM)

✓ IN STOCK
$69.95

ℹ️ Product Notes

This is a used part. This control module works with the OnStar communication system in your vehicle. It is designed for vehicles with option code UE1. The main ID number for this part is 25757719.

Fits vehicles with OnStar (option code UE1) only. Check your glove box sticker for code UE1 to ensure this matches your car.
Condition: Excellent (A)
Like new, minimal to no wear
43,073 miles
Odometer reading when part was removed
SKU #
994205-23210-195

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 2004-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
A SUV 2004 - 2005 L6 4.2L RWD | Automatic
B SUV 2004 - 2005 L6 4.2L RWD | Automatic
Base SUV 2004 - 2005 L6 4.2L RWD | Automatic
LS SUV 2004 - 2005 L6 4.2L RWD/4WD | Automatic
LT SUV 2004 - 2005 L6 4.2L RWD/4WD | Automatic
North Face SUV 2004 L6 4.2L RWD/4WD | Automatic
Q SUV 2005 L6 4.2L RWD | Automatic
R SUV 2005 L6 4.2L 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

Is your car acting strange? A bad Telematics Control Module (TCM) can cause several problems. Here's how to tell if yours might be failing:

  • Dead Battery: The TCM can stay on even when the car is off, draining the battery.
  • OnStar Issues: Problems connecting to OnStar or the system not working at all.
  • Navigation Problems: The navigation system might freeze, give wrong directions, or not work.
  • Remote Key Fob Issues: Your key fob might not lock or unlock the doors, or start the car.
  • Error Messages: You might see warning lights or messages on your dashboard related to the communication system.

How to test it:

  1. Check your car's battery voltage. A low voltage can cause TCM problems.
  2. Use a scan tool to check for diagnostic trouble codes (DTCs) related to the TCM.
  3. Inspect the wiring and connections to the TCM for damage or corrosion.
  4. If possible, swap the TCM with a known good one to see if the problems go away. This should be done by a professional.

Common causes of failure:

  • Water Damage: Leaks can damage the TCM's sensitive electronics.
  • Electrical Surges: Power surges can fry the TCM.
  • Old Age: Over time, the components inside the TCM can wear out.
  • Corrosion: Corrosion on the connectors can cause communication problems.

Buyer's Checklist

Buying a replacement TCM? Here's what to look for:

  • Check the Part Number: Make sure the replacement part is compatible with your car.
  • Warranty: Look for a part with a warranty. This protects you if the part fails soon after you buy it.
  • Seller Reputation: Buy from a trusted seller with good reviews.
  • Condition: Decide if you want a used OEM or a new aftermarket part.

Quality indicators:

  • OEM Markings: Used OEM parts should have the original manufacturer's markings.
  • Cleanliness: The part should be clean and free of corrosion.
  • Testing: Ask if the part has been tested to ensure it works.

What's included:

  • The Telematics Control Module itself.
  • Sometimes, mounting hardware may be included.

Installation Overview

Replacing the TCM isn't too hard, but take your time.

  • Difficulty: Moderate
  • Estimated Time: 1-2 hours

Special tools:

  • Socket set
  • Screwdrivers
  • Scan tool (to clear codes after installation)

Critical steps and tips:

  1. Disconnect the negative battery cable before starting.
  2. Locate the TCM. It's often under the dash or in the trunk.
  3. Disconnect the wiring harness from the TCM.
  4. Remove the old TCM.
  5. Install the new TCM.
  6. Reconnect the wiring harness.
  7. Reconnect the negative battery cable.
  8. Use a scan tool to clear any diagnostic trouble codes (DTCs).

DIY or professional?

  • If you're comfortable working on cars and have some experience, you can probably do it yourself. If not, a professional mechanic is recommended.

Buying Options

You have a couple of choices when buying a replacement TCM:

  • Used OEM
  • New Aftermarket

Used OEM:

  • Pros: Genuine factory part, tested and inspected, lower price.
  • Cons: Might have some wear and tear.

New Aftermarket:

  • Pros: Brand new, built to OE specs.
  • Cons: Might not be as reliable as an OEM part, can be more expensive than used.

Typical Lifespan

A TCM usually lasts for:

  • Average: 8-12 years

Factors that affect lifespan:

  • Climate: Extreme temperatures can shorten the TCM's life.
  • Water Damage: Leaks can damage the TCM.
  • Electrical Problems: Power surges can damage the TCM.

Price Ranges

Here's a general idea of what you can expect to pay:

  • Used OEM: $50 - $150
  • New Aftermarket: $100 - $300
  • Labor Cost: $75 - $150

Total job cost:

  • DIY: $50 - $300 (depending on part choice)
  • Professional: $125 - $450 (including parts and labor)

Vehicle-Specific Notes

Some vehicles have known issues with the TCM:

  • Some models have problems with water leaks that can damage the TCM. Check for signs of water damage before replacing the TCM.
  • Some owners have reported problems with the OnStar system after replacing the TCM. Make sure the new TCM is properly programmed.

Verification After Install

After installing the new TCM, make sure it's working correctly:

  • Check OnStar: Verify that you can connect to OnStar.
  • Test Navigation: Make sure the navigation system is working properly.
  • Test Key Fob: Check that your key fob can lock and unlock the doors, and start the car.
  • Scan for Codes: Use a scan tool to check for any new diagnostic trouble codes (DTCs).

FAQ

  • Q: Will this TCM need to be programmed?
  • A: Yes, it may need to be programmed to your specific vehicle. Check with a professional mechanic.
  • Q: How do I know if my TCM is really bad?
  • A: Look for the symptoms listed above, and have a mechanic diagnose the problem.
  • Q: What happens if I don't replace my bad TCM?
  • A: Your car might have electrical problems, and your OnStar and navigation systems won't work. It can also drain your battery.
  • Q: Can I use a TCM from a different year car?
  • A: It's best to use a TCM that's specifically designed for your year, make, and model.
  • Q: Where is the TCM located in my car?
  • A: The location varies, but it's often under the dash or in the trunk. Consult your car's repair manual.

Part Specifications

OEM Part Numbers:

  • GM: 10376431, 19116569, 25757719

Fits Years: 2004 2005

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