U071D - Understanding the Transmission Control Module Communication Error in 2015-2020 Ford F-150 and Other Models

Quick Answer

U071D means: U071D indicates a communication issue between the Transmission Control Module and other vehicle modules.

Fix: Check and replace faulty components Cost: $500 - $1200 Time: 90-180 minutes

Can I drive with U071D? Immediate attention is recommended to avoid transmission damage.

Common Questions

What does U071D mean and how does it affect my car?

U071D indicates a communication error between your vehicle's Transmission Control Module and other systems. This can lead to poor shifting performance, decreased acceleration, and, if ignored, potential transmission damage that may require costly repairs.

What are the most common causes of U071D and how much does it cost to fix?

Common causes include a faulty Transmission Control Module, wiring issues, or CAN bus problems. Repair costs can range from $100 for simple wiring fixes to over $1200 for a complete TCM replacement.

Can I drive my car with U071D or should I stop immediately?

It's advised to avoid driving your vehicle until the issue is resolved. Driving with U071D could lead to transmission failure, which poses safety risks and may result in more expensive repairs.

How can I diagnose U071D myself using GeekOBD APP?

Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor live sensor readings. This will help you identify if other codes or data points are contributing to the issue.

What vehicles are most commonly affected by U071D?

While U071D can affect various vehicles, it's particularly common in 2015-2020 Ford F-150 models, as well as certain models from Lincoln and other brands using similar transmission systems.

How can I prevent U071D from happening again?

Regular vehicle maintenance, including checking electrical connections and ensuring the TCM is updated, can help prevent U071D. Additionally, using quality parts during repairs can reduce the likelihood of future issues.

What is U071D?

The diagnostic trouble code (DTC) U071D signifies a communication error between the Transmission Control Module (TCM) and other control modules within the vehicle's network. This code often indicates that the TCM is unable to receive or send messages due to various reasons, including wiring issues, a faulty TCM, or problems with the vehicle's CAN bus system. For owners of vehicles like the 2015-2020 Ford F-150, experiencing this code can lead to significant performance issues such as erratic shifting, poor acceleration, or even complete failure to engage the transmission. The TCM is crucial for ensuring that the transmission operates efficiently and effectively, and any communication breakdown can result in reduced drivability and safety concerns. If you've noticed your check engine light illuminating alongside symptoms like delayed gear changes or unexpected shifts, it's essential to address this issue promptly. Ignoring a U071D code can lead to further complications and higher repair costs, so understanding the implications and seeking a professional diagnosis is critical for vehicle longevity and performance.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U071D is present:

  • Check engine light remains illuminated, indicating an underlying issue that needs attention.
  • Transmission experiences erratic shifting patterns, causing a noticeable delay or harsh engagement during gear changes.
  • Poor acceleration can occur, with the vehicle feeling sluggish or unresponsive when attempting to speed up.
  • Transmission may enter 'limp mode', restricting vehicle speed and performance to protect the system from damage.
  • Inconsistent fuel economy readings, potentially decreasing by 10-15% due to transmission inefficiencies.

Possible Causes

Most common causes of U071D (ordered by frequency):

  1. Faulty Transmission Control Module (TCM) - This is the most common cause, with a likelihood of around 40%. A malfunctioning TCM can disrupt communication and lead to erratic vehicle behavior.
  2. Wiring issues or damaged connectors - Approximately 30% of U071D codes stem from frayed wires or poor connections that impede communication between the TCM and other modules.
  3. CAN bus issues - About 20% of cases relate to problems within the Controller Area Network (CAN) that affects how modules relay information.
  4. Less common causes may include software glitches in the TCM, which can sometimes be resolved with a software update from the manufacturer.
  5. Rarely, issues with the vehicle's power supply or battery can lead to communication faults, impacting module performance.

U071D Repair Costs

Cost Breakdown by Repair Type

TCM Replacement

Replacing the Transmission Control Module if it is found to be faulty.

  • Total: $500 - $1200
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors that affect communication.

  • Total: $100 - $300
  • Success rate: 80%
Software Update

Updating the TCM software if a glitch is suspected.

  • Total: $50 - $150
  • Success rate: 70%
Money-Saving Tips for U071D
  • 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 U071D Diagnosis Process

Follow these systematic steps to accurately diagnose U071D. 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). Look for frayed cables near the TCM and inspect connectors for any signs of wear.

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). This will help identify if other codes are present that may relate to the U071D.

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, focusing on the TCM and associated wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on the TCM and associated wiring (20-30 minutes). Ensure that voltage and ground signals are within specifications.

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 (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes). This may involve driving the vehicle to confirm that the transmission operates smoothly.

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 transmission behaves as expected (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure that the transmission behaves as expected (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: Ford F-150 Transmission Control Module Replacement

Vehicle: 2018 Ford F-150, 45,000 miles

Problem: Customer reported erratic shifting and check engine light on.

Diagnosis: Performed a scan with GeekOBD APP, confirmed U071D and inspected TCM wiring.

Solution: Replaced the TCM and repaired damaged wiring.

Cost: $1,000 (including parts and labor)

Result: Customer reported smooth shifting and improved vehicle performance post-repair.

Case Study 2: Chevrolet Silverado Wiring Repair

Vehicle: 2017 Chevrolet Silverado, 60,000 miles

Problem: Transmission stuck in limp mode and check engine light illuminated.

Diagnosis: Used GeekOBD APP to retrieve U071D and examined wiring harness.

Solution: Repaired frayed wires and cleaned connectors.

Cost: $250 (for parts and labor)

Result: Transmission returned to normal operation, and the check engine light was cleared.

Diagnose U071D

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: U071D
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes