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Body Control Module

2006 - 2009 Chevrolet Trailblazer Transmission Control Module (OEM)

✓ IN STOCK
$103.95

ℹ️ Product Notes

This is a used part in good condition with no damage. This is a transmission control module for vehicles with a 4.8L 8-cylinder engine and a 4-speed automatic transmission. It is for 4-wheel drive models and 2-door body styles. This part is for vehicles without an auxiliary oil cooler control, without an auxiliary oil cooler pump, and without the hybrid option.

Fits 4-speed automatic transmissions only. This part requires professional programming after installation. It will not work on hybrid vehicles.
Condition: Excellent (A)
Like new, minimal to no wear
134,549 miles
Odometer reading when part was removed
SKU #
613539401-07270-195

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 2006-2009 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
A SUV 2006 - 2007 L6 4.2L RWD | Automatic
B SUV 2006 - 2007 L6 4.2L RWD | Automatic
B SUV 2006 L6 4.2L 4WD | Automatic
Base SUV 2006 - 2008 L6 4.2L RWD | Automatic
LS SUV 2006 - 2007 L6 4.2L RWD/4WD | Automatic
LS SUV 2006 - 2007 V8 5.3L RWD/4WD | Automatic
LT SUV 2006 - 2009 L6 4.2L RWD/4WD | Automatic
LT SUV 2006 - 2008 V8 5.3L RWD/4WD | Automatic
SS SUV 2006 - 2009 V8 6.0L AWD/RWD | Automatic
Base SUV 2008 L6 4.2L 4WD | Automatic
Base SUV 2008 V8 5.3L RWD/4WD | 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 Transmission Control Module (TCM)

  • Erratic shifting or failure to shift gears properly
  • Harsh or delayed gear engagement
  • Transmission slipping
  • Getting stuck in a single gear (limp mode)
  • Check Engine Light is on (specifically transmission-related codes)
  • Reduced fuel economy
  • Complete loss of transmission function

How to Test the TCM

Diagnosing a TCM issue requires a systematic approach. While some symptoms can point to a faulty TCM, it's important to rule out other potential causes.

  1. Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to retrieve any stored trouble codes related to the transmission. This is the first step in identifying the problem.
  2. Check Transmission Fluid Level and Condition: Low or contaminated transmission fluid can cause shifting problems that mimic TCM failures. Ensure the fluid is at the correct level and in good condition (reddish-pink and free of debris).
  3. Inspect Wiring and Connections: Carefully inspect the wiring harness and connectors leading to the TCM and transmission. Look for any signs of damage, corrosion, or loose connections.
  4. Test Sensors and Solenoids: Use a multimeter to test the resistance and voltage of the transmission sensors and solenoids. Faulty sensors can send incorrect signals to the TCM, causing shifting problems.
  5. Professional Diagnosis: If you've checked the basics and are still unsure, take your vehicle to a qualified mechanic for a professional diagnosis. They have specialized tools and knowledge to pinpoint the exact cause of the problem.

Common Causes of TCM Failure

  • Overheating: Excessive heat can damage the sensitive electronic components inside the TCM.
  • Vibration: Constant vibration can weaken solder joints and connections within the TCM.
  • Moisture Intrusion: Water or other fluids can corrode the internal circuitry of the TCM.
  • Electrical Surges: Voltage spikes can damage the TCM's electronic components.
  • Age and Wear: Over time, the components inside the TCM can simply wear out.

Buyer's Checklist

What to Look For When Buying a TCM

  • Correct Part for Your Vehicle: Ensure the TCM is compatible with your vehicle's year, make, model, and engine.
  • Warranty: Look for a warranty that covers defects in materials and workmanship.
  • Seller Reputation: Purchase from a reputable seller with positive reviews and a history of selling quality auto parts.

Quality Indicators

FeatureUsed OEMNew Aftermarket
SourceOriginal vehicle manufacturerThird-party manufacturer
TestingTested and inspected for functionalityNew, but may have varying quality control
ReliabilityGenerally reliable due to OEM standardsCan vary depending on the manufacturer
PriceTypically lower than new aftermarketCan be competitive, but quality varies

What's Typically Included

  • The Transmission Control Module itself.
  • Some sellers may include installation instructions or diagrams.

Installation Overview

Difficulty Level and Estimated Time

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

Special Tools Needed

  • Basic hand tools (sockets, wrenches, screwdrivers)
  • OBD-II scanner (for clearing codes)
  • Multimeter (optional, for testing)

Critical Steps and Tips

  1. Disconnect the Battery: Before starting any electrical work, disconnect the negative battery cable to prevent electrical shorts.
  2. Locate the TCM: The TCM is typically located under the dashboard, under a seat, or in the engine compartment. Consult your vehicle's repair manual for the exact location.
  3. Disconnect the Wiring Harness: Carefully disconnect the wiring harness from the TCM. Be sure to release any locking tabs or connectors.
  4. Remove the Old TCM: Remove the screws or bolts that secure the TCM to its mounting bracket.
  5. Install the New TCM: Install the new TCM in the reverse order of removal.
  6. Reconnect the Wiring Harness: Reconnect the wiring harness to the TCM, ensuring that all connectors are securely attached.
  7. Reconnect the Battery: Reconnect the negative battery cable.
  8. Clear Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to clear any DTCs related to the transmission.
  9. Test Drive: Take your vehicle for a test drive to ensure that the transmission is shifting properly.

DIY or Professional Installation?

  • DIY: If you have experience working on cars and are comfortable with basic electrical repairs, you may be able to install the TCM yourself.
  • Professional Installation: If you are not comfortable working on cars or are unsure about any of the steps involved, it is best to have the TCM installed by a qualified mechanic.

Buying Options

Compare: Used OEM, New Aftermarket

FeatureUsed OEMNew Aftermarket
SourceOriginal vehicle manufacturerThird-party manufacturer
ReliabilityGenerally reliable due to OEM standardsCan vary depending on the manufacturer
PriceTypically lowerCan be competitive, but quality varies
WarrantyUsually comes with a limited warrantyWarranty terms vary by seller

Used OEM

Used OEM TCMs offer excellent value. These are genuine factory parts that have been removed from vehicles. They are thoroughly tested and inspected to ensure they are in good working condition. You get a reliable, original part at a significantly lower price than a new one.

New Aftermarket

New aftermarket TCMs are brand new parts manufactured by third-party companies. These parts are designed to meet or exceed OE specifications. They can be a good option if you prefer a new part and are willing to research reputable aftermarket brands.

Typical Lifespan

How Long This Part Normally Lasts

A TCM can last for the lifetime of the vehicle, but its lifespan is dependent on several factors. It can last 100,000 miles or more.

Factors That Affect Longevity

  • Driving Habits: Aggressive driving can put extra strain on the transmission and TCM.
  • Maintenance: Regular transmission fluid changes can help to prolong the life of the TCM.
  • Environmental Conditions: Extreme temperatures and humidity can damage the TCM.
  • Vehicle Usage: Towing heavy loads can increase the risk of TCM failure.

Price Ranges

Budget vs Mid-Range vs Premium Options

  • Used OEM: $100 - $300
  • New Aftermarket: $200 - $500

Labor Cost Considerations

  • Professional installation can add $100 - $300 to the total cost.

Total Job Cost Estimates

  • DIY (Used OEM): $100 - $300
  • DIY (New Aftermarket): $200 - $500
  • Professional Installation (Used OEM): $200 - $600
  • Professional Installation (New Aftermarket): $300 - $800

Vehicle-Specific Notes

Known Issues

Some vehicles within the listed year range are known to have issues with the valve body in the transmission, which can mimic TCM problems. Always diagnose thoroughly before replacing the TCM.

TSBs or Common Complaints

Check for any Technical Service Bulletins (TSBs) related to transmission issues on your specific vehicle model. These TSBs can provide valuable information about common problems and recommended solutions.

Verification After Install

How to Confirm Proper Operation

  • Smooth Shifting: The transmission should shift smoothly and seamlessly through all gears.
  • No Slipping: The transmission should not slip or hesitate when accelerating.
  • No Harsh Shifting: There should be no harsh or jarring shifts.
  • Check Engine Light Off: The Check Engine Light should be off, and no transmission-related DTCs should be stored.

What to Look/Listen For

  • Listen for unusual noises: There should be no unusual noises coming from the transmission.
  • Monitor shift points: The transmission should shift at the correct RPMs.
  • Check for proper gear engagement: The transmission should engage each gear quickly and smoothly.

FAQ

Q: How do I know if my TCM is bad?
A: Common symptoms include erratic shifting, transmission slipping, getting stuck in gear, and a Check Engine Light.

Q: Can I replace the TCM myself?
A: If you have experience working on cars and are comfortable with basic electrical repairs, you may be able to replace the TCM yourself. Otherwise, professional installation is recommended.

Q: Will a new TCM need to be programmed?
A: Some TCMs may require programming to match your vehicle's specific configuration. Check with the seller or a qualified mechanic to determine if programming is necessary.

Q: What is the difference between a used OEM and a new aftermarket TCM?
A: A used OEM TCM is a genuine factory part that has been removed from a vehicle, while a new aftermarket TCM is manufactured by a third-party company. Used OEM parts are typically less expensive and have a proven track record of reliability.

Q: How long will a used OEM TCM last?
A: A used OEM TCM can last for many years, depending on driving habits, maintenance, and environmental conditions.

Part Specifications

OEM Part Numbers:

  • GM: 24230461, 24234274, 24234503, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24252114, 242521142145, 24255280, 24256960, YNXS

Fits Years: 2006 2007 2008 2009

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