U071A - Understanding the OBD2 Code and Its Impact on Vehicles Like the 2015-2018 Ford Explorer

Quick Answer

U071A means: U071A indicates a communication issue between the transmission control module and the powertrain control module.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with U071A? Address immediately to prevent transmission damage.

Common Questions

What does U071A mean and how does it affect my car?

The U071A code signifies a communication error between your vehicle's transmission control module and the powertrain control module. This can lead to poor transmission performance, erratic shifting, and even a loss of power. If not addressed, it can result in costly repairs.

What are the most common causes of U071A and how much does it cost to fix?

Common causes of U071A include a faulty TCM, damaged wiring, or software issues. Repair costs can range from as low as $50 for a software update to $800 for a complete TCM replacement, depending on the specific issue.

Can I drive my car with U071A or should I stop immediately?

It's advisable to stop driving if you see the U071A code, as it can lead to further transmission damage. Driving with this code can result in erratic shifting and even a complete loss of power to the transmission.

How can I diagnose U071A myself using GeekOBD APP?

Using the GeekOBD APP, you can scan your vehicle for trouble codes and view freeze frame data. Look for any other related codes that might give you more context on the issue. The app can also help you clear codes after repairs are completed.

What vehicles are most commonly affected by U071A?

The U071A code is frequently seen in models such as the 2015-2018 Ford Explorer and various Ford and Lincoln vehicles. Be sure to check service bulletins or recalls specific to your vehicle.

How can I prevent U071A from happening again?

Regular vehicle maintenance, including wiring checks and software updates, can help prevent U071A from recurring. Ensure that your vehicle is serviced regularly and that any electrical issues are addressed promptly.

What is U071A?

The diagnostic trouble code (DTC) U071A is a communication error related to the Transmission Control Module (TCM) and the Powertrain Control Module (PCM). This code indicates that the TCM is unable to communicate effectively with the PCM, which can result in various operational issues. In simpler terms, your vehicle's computer system is having trouble talking to itself. When this happens, it can affect how the transmission shifts, potentially leading to erratic shifting, poor acceleration, and decreased fuel efficiency. The U071A code is commonly seen in vehicles like the 2015-2018 Ford Explorer, as well as several models from Ford and Lincoln equipped with similar transmission setups. If you encounter this code, it’s crucial to address it promptly. Ignoring it can lead to further complications, including permanent transmission damage. Symptoms you may experience include the check engine light activating, unusual engine performance, or even a complete loss of power to the transmission. To resolve this issue, you may need to inspect wiring, update software, or replace faulty parts. The sooner you tackle the U071A code, the better your chances of avoiding extensive repairs down the line.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U071A is present:

  • The check engine light illuminates on the dashboard, remaining activated until the issue is resolved.
  • You may experience erratic shifting, where the transmission shifts unexpectedly or harshly during driving.
  • The vehicle may hesitate during acceleration, leading to a sluggish response when pressing the gas pedal.
  • You might notice a significant drop in fuel economy, potentially decreasing by 10-15% as the vehicle struggles to operate efficiently.
  • In severe cases, the vehicle may enter 'limp mode,' restricting speed and power to protect the engine and transmission.

Possible Causes

Most common causes of U071A (ordered by frequency):

  1. The most common cause is a faulty TCM, with a likelihood of around 50%. This can occur due to manufacturing defects or wear over time.
  2. Another frequent cause is damaged wiring or loose connections between the TCM and PCM, which can disrupt communication. This may happen due to corrosion or wear and tear.
  3. Software glitches in the TCM or PCM can also trigger the U071A code. Keeping the vehicle's software updated can help prevent these issues.
  4. A less common but serious cause could be a failing transmission or internal component failure, which might require extensive repairs or rebuilds.
  5. In rare cases, environmental factors like moisture or extreme temperatures may contribute to communication issues between modules.

U071A Repair Costs

Cost Breakdown by Repair Type

Transmission Control Module Replacement

Replacing the faulty TCM can resolve communication issues and ensure proper transmission operation.

  • Total: $300 - $800
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring or connectors can restore communication between the TCM and PCM.

  • Total: $100 - $300
  • Success rate: 75%
Software Update

Updating the TCM software can sometimes resolve glitches causing the U071A code.

  • Total: $50 - $150
  • Success rate: 65%
Money-Saving Tips for U071A
  • 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 U071A Diagnosis Process

Follow these systematic steps to accurately diagnose U071A. 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 wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the TCM and wiring (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, clear codes, and check for any reoccurrence (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs, clear codes, and check for any reoccurrence (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 the code does not reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure the code does not reappear (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 Explorer Transmission Control Module Replacement

Vehicle: 2017 Ford Explorer, 65,000 miles

Problem: Customer reported the check engine light was on, and the vehicle experienced harsh shifting.

Diagnosis: After scanning with the GeekOBD APP, the U071A code was confirmed. A visual inspection revealed damaged wiring near the TCM.

Solution: Replaced the damaged wiring and the TCM. Conducted a software update and cleared the codes.

Cost: $750 (parts: $500 for TCM, $250 for labor)

Result: The check engine light turned off, and the transmission shifted smoothly during a road test.

Case Study 2: Wiring Repair for U071A Code

Vehicle: 2016 Ford Fusion, 80,000 miles

Problem: Customer complained of poor acceleration and the check engine light was illuminated.

Diagnosis: The GeekOBD APP revealed U071A along with other communication codes. Inspection showed corrosion on the wiring harness.

Solution: Repaired the corroded connections and rewrapped the wiring. No parts were needed except for electrical tape.

Cost: $150 (labor included)

Result: After repairs, the vehicle performed well, with no codes reappearing during a follow-up scan.

Diagnose U071A

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: U071A
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes