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Body Control Module
This photo shows the same type of part you'll receive. Since each used part has its own wear and scratches, yours may look slightly different. Check the product notes for details about the condition of this specific part.

2003 - 2005 BMW Z4 Transmission Control Module (OEM)

✓ IN STOCK
$69.95

ℹ️ Product Notes

This is a used part. This is a Chassis Control Module, which is also called a Transmission ECU. It fits vehicles with a 3.0L engine. This module may need to be programmed before it will work correctly.

Requires professional programming to your vehicle's VIN. Fits 3.0L engines only. Match your original part number exactly to ensure compatibility.

Original Part #(s): 24607532988, 246075420, 24607542040, 24607543040, 24607544721, 24607552700, 7532988, 7544721, 7552700
Condition: Excellent (A)
Like new, minimal to no wear
104,325 miles
Odometer reading when part was removed
SKU #
7645751-A79435-195

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:

BMW
Z4 2003-2005 (tapclick to expand)(tapclick to hide)
Swipe left/right to see more info
SubmodelSUB-
MODEL		 Body Style Years Engine Attributes
3.0i Convertible 2003 - 2005 L6 3.0L RWD | Automatic & Manual | 3.0i models only
2004

⚠️ 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 BMW having trouble shifting gears? A failing Transmission Control Module (TCM) could be the problem. Here's how to tell:

  • Rough or erratic shifting: The car shifts hard, late, or at the wrong times.
  • Stuck in gear: The transmission won't shift out of a specific gear.
  • Transmission slipping: The engine revs up, but the car doesn't accelerate properly.
  • Check Engine light: A warning light on your dashboard could indicate a TCM issue.
  • Transmission warning light: A specific transmission warning light might illuminate.
  • Poor fuel economy: The car uses more gas than usual.
  • Complete transmission failure: The car won't move at all.

Testing the TCM:

  1. Have a mechanic scan your car's computer for error codes. This can pinpoint the TCM or other related issues.
  2. Check the wiring and connections to the TCM. Look for corrosion, damage, or loose connections.
  3. Test the TCM's power and ground circuits. Make sure the module is receiving the correct voltage.

Common Causes of TCM Failure:

  • Overheating: High temperatures can damage the TCM's internal components.
  • Fluid contamination: Dirty or low transmission fluid can cause the transmission to work harder, stressing the TCM.
  • Electrical surges: Voltage spikes can fry the TCM's circuits.
  • Vibration: Constant vibration can loosen connections and damage the TCM.
  • Age: Like any electronic component, the TCM can simply wear out over time.

Buyer's Checklist

When buying a replacement TCM, keep these points in mind:

  • Check compatibility: Make sure the TCM is specifically designed for your BMW model and year.
  • Verify the part number: Although we don't list them here, confirm the replacement matches the original part number from your old TCM.
  • Inspect the TCM: Look for any signs of damage, corrosion, or tampering.
  • Ask about warranty: A warranty can protect you if the TCM fails prematurely.

Quality Indicators:

  • OEM (Original Equipment Manufacturer): These parts are made by the same manufacturer as the original TCM.
  • Testing and Inspection: Make sure the TCM has been thoroughly tested and inspected to ensure it's working properly.

What's Typically Included:

  • The TCM itself.
  • Sometimes, basic installation instructions.

Installation Overview

Replacing a TCM can range from moderately difficult to challenging.

  • Difficulty Level: Medium to Hard
  • Estimated Time: 1-3 hours

Special Tools Needed:

  • Socket set
  • Screwdrivers
  • Scan tool (for clearing codes)
  • Possibly a multimeter

Critical Steps and Tips:

  1. Disconnect the negative battery cable before starting.
  2. Locate the TCM (usually under the hood or inside the cabin).
  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 error codes.

DIY or Professional Installation?

  • If you have experience working on cars and are comfortable with electrical systems, you can attempt to replace the TCM yourself.
  • However, if you're not confident, it's best to have a professional mechanic install it. Incorrect installation can damage the TCM or other components.

Buying Options

Let's explore your options for buying a TCM:

  • Used OEM: These are genuine factory parts that have been removed from used vehicles. They offer excellent value because they are tested, inspected, and available at a lower price than new parts.
  • New Aftermarket: These are brand-new parts manufactured by third-party companies. They are designed to meet or exceed the original equipment specifications.

Used OEM:

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

New Aftermarket:

  • Pros: Brand new, readily available.
  • Cons: May not be the same quality as OEM, can be more expensive.

Typical Lifespan

A TCM can last for many years, but its lifespan depends on several factors.

  • Typical Lifespan: 7-10 years or more

Factors Affecting Longevity:

  • Driving habits: Aggressive driving can put more stress on the transmission and TCM.
  • Maintenance: Regular transmission fluid changes can help prolong the life of the TCM.
  • Environmental conditions: Extreme temperatures and humidity can damage the TCM.

Price Ranges

The cost of a TCM can vary depending on the source and condition.

  • Used OEM: $150 - $400
  • New Aftermarket: $300 - $600

Labor Cost Considerations:

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

Total Job Cost Estimates:

  • DIY (Used OEM): $150 - $400
  • Professional Installation (Used OEM): $250 - $700
  • DIY (New Aftermarket): $300 - $600
  • Professional Installation (New Aftermarket): $400 - $900

Vehicle-Specific Notes

Some BMW models from this era are known to have issues with the transmission mechatronic unit, which includes the TCM.

  • Common Complaints: Rough shifting, transmission slipping, and failure to shift.
  • TSBs (Technical Service Bulletins): Check with your local BMW dealer or online resources for any TSBs related to the transmission or TCM.

Verification After Install

After installing the new TCM, it's important to verify that it's working correctly.

  • Check for smooth shifting: The transmission should shift smoothly and effortlessly through all gears.
  • Listen for unusual noises: There should be no unusual noises coming from the transmission.
  • Monitor the Check Engine light: Make sure the Check Engine light is off.
  • Test drive the vehicle: Drive the car in various conditions to ensure the transmission is performing as expected.

FAQ

Q: Will a used TCM need to be programmed?
A: It might. Some BMW models require the TCM to be programmed to the vehicle's specific VIN. Check with a BMW specialist.

Q: How often should I change my transmission fluid?
A: Refer to your owner's manual, but typically every 60,000 to 100,000 miles is recommended.

Q: Can a bad battery cause TCM problems?
A: Yes, a weak or failing battery can cause voltage fluctuations that can damage the TCM.

Q: Is it okay to drive with a faulty TCM?
A: It's not recommended. Driving with a faulty TCM can damage the transmission and create a safety hazard.

Q: How do I know if the TCM is the only problem?
A: A professional mechanic can diagnose the problem and determine if the TCM is the sole cause or if other components are also failing.

Part Specifications

OEM Part Numbers:

  • BMW: 24607532988, 246075420, 24607542040, 24607543040, 24607544721, 24607552700, 7532988, 7544721, 7552700

Fits Years: 2003 2004 2005

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