B0744 - Transmission Control Module (TCM) Malfunction - Common in 2007-2011 Ford Fusion and 2008-2010 Mercury Milan

Quick Answer

B0744 means: B0744 indicates a malfunction in the Transmission Control Module (TCM) circuit.

Fix: Check and replace faulty components Cost: $500 - $1,200 Time: 90-180 minutes

Can I drive with B0744? Immediate attention is recommended to prevent transmission damage.

Common Questions

What does B0744 mean and how does it affect my car?

The B0744 code indicates a malfunction in your vehicle's Transmission Control Module (TCM). This can lead to rough shifting, decreased fuel efficiency, and may even cause stalling. As the TCM manages the operation of your automatic transmission, any faults can significantly impact your driving experience and safety.

What are the most common causes of B0744 and how much does it cost to fix?

Common causes of the B0744 code include a faulty TCM, damaged wiring, low transmission fluid, and sensor malfunctions. Repair costs can vary widely; replacing a TCM may cost between $500 and $1,200, while fixing wiring issues could range from $100 to $300.

Can I drive my car with B0744 or should I stop immediately?

Driving with a B0744 code is not recommended, as it can lead to further transmission damage and unsafe driving conditions. It's best to address this issue promptly to ensure your vehicle remains safe and reliable.

How can I diagnose B0744 myself using GeekOBD APP?

To diagnose B0744 with the GeekOBD APP, start by connecting the device to your vehicle's OBD2 port. Use the app to retrieve stored codes, including B0744, and review freeze frame data for context. It can also help you monitor live data and perform tests to identify which components may be faulty.

What vehicles are most commonly affected by B0744?

The B0744 code is often found in vehicles like the 2007-2011 Ford Fusion and 2008-2010 Mercury Milan. These models have been reported to experience TCM-related issues, leading to the appearance of this diagnostic trouble code.

How can I prevent B0744 from happening again?

Regular maintenance of your vehicle's transmission system is crucial. This includes checking and changing transmission fluid at recommended intervals, inspecting wiring and connectors for wear, and keeping the TCM software updated. Additionally, using quality transmission fluid can help maintain optimal performance.

What is B0744?

The diagnostic trouble code (DTC) B0744 indicates a malfunction in the Transmission Control Module (TCM), which is responsible for managing the transmission's functions and performance. When this code is triggered, it typically signifies that the TCM has detected a fault in the circuit or communication within the system. This issue can lead to improper shifting, decreased fuel efficiency, and even potential stalling of your vehicle. For instance, owners of 2007-2011 Ford Fusion models may experience rough shifts or delayed engagement of gears, making driving uncomfortable and potentially unsafe. Understanding the implications of a B0744 code is crucial, as ignoring it could exacerbate the problem, leading to more severe transmission issues and costly repairs down the line. If you're experiencing problems with your vehicle's transmission, it's vital to address this code promptly to ensure your car's reliability and performance.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0744 is present:

  • Check engine light illuminated, indicating a fault in the transmission system.
  • Rough or delayed shifting, making acceleration jerky and uncomfortable during driving.
  • Decreased fuel economy, potentially dropping by 10-15% due to improper gear engagement.
  • Transmission slipping, where the vehicle unexpectedly loses power during acceleration.
  • Unusual noises from the transmission, such as grinding or clunking sounds during gear changes.

Possible Causes

Most common causes of B0744 (ordered by frequency):

  1. 1. Faulty Transmission Control Module (TCM) - 40% likelihood: The TCM itself may be malfunctioning due to internal issues or software problems, which can disrupt its communication with other vehicle systems.
  2. 2. Wiring issues - 25% likelihood: Damaged or corroded wiring and connectors leading to the TCM can cause intermittent faults, resulting in the B0744 code.
  3. 3. Low transmission fluid - 20% likelihood: Insufficient fluid levels can lead to overheating and erratic transmission behavior, which may trigger this code. Regular fluid checks and changes are recommended.
  4. 4. Sensor malfunctions - 10% likelihood: Faulty inputs from sensors related to the transmission can send incorrect data to the TCM, resulting in operational failures.
  5. 5. Software glitches - 5% likelihood: Occasionally, software updates or glitches in the TCM's programming can lead to false readings and trigger the B0744 code.

B0744 Repair Costs

Cost Breakdown by Repair Type

Replace Transmission Control Module (TCM)

Replacing a faulty TCM to restore proper transmission function.

  • Total: $500 - $1,200
  • Success rate: 85%
Repair Wiring Issues

Fixing or replacing damaged wiring and connectors leading to the TCM.

  • Total: $100 - $300
  • Success rate: 75%
Transmission Fluid Change

Changing low or contaminated transmission fluid to prevent overheating.

  • Total: $80 - $150
  • Success rate: 60%
Money-Saving Tips for B0744
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional B0744 Diagnosis Process

Follow these systematic steps to accurately diagnose B0744. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the TCM and related sensors (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the TCM and related sensors (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the B0744 code does not return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the B0744 code does not return (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Fixing TCM Malfunction in a 2008 Ford Fusion

Vehicle: 2008 Ford Fusion, 120,000 miles

Problem: Customer reported rough shifting and a persistent check engine light.

Diagnosis: Diagnostic scanning revealed B0744 and inspection showed corroded wiring to the TCM.

Solution: Replaced the damaged wiring harness and reprogrammed the TCM.

Cost: $750 (parts: $300 for wiring, $450 for labor)

Result: After the repair, the customer reported smooth shifting and no recurrence of the check engine light.

Case Study 2: Transmission Control Module Replacement on a 2010 Mercury Milan

Vehicle: 2010 Mercury Milan, 80,000 miles

Problem: Vehicle exhibited erratic shifting and engine stalling occasionally.

Diagnosis: OBD2 scan confirmed the B0744 code, with tests indicating a faulty TCM.

Solution: Replaced the TCM and completed a fluid change.

Cost: $1,100 (parts: $700 for TCM, $400 for labor)

Result: Post-repair, the vehicle performed normally without further issues.

Diagnose B0744

Use GeekOBD APP for professional diagnosis!

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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B0744
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes