U071C - Understanding Common in 2015-2018 Ford F-150 and Other Models

Quick Answer

U071C means: U071C indicates a communication issue between the transmission control module and other systems.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U071C? Immediate attention is recommended to prevent further transmission damage.

Common Questions

What does U071C mean and how does it affect my car?

U071C indicates a communication problem between your transmission control module and other vehicle systems. This can lead to erratic shifting, poor fuel economy, and may put your vehicle into limp mode, which restricts performance to avoid damage. If left unchecked, it could result in more serious transmission issues.

What are the most common causes of U071C and how much does it cost to fix?

The most common causes of U071C include faulty wiring (60% likelihood), malfunctioning transmission control modules (25%), and low or dirty transmission fluid. Repair costs can vary widely, ranging from $100 for wiring repairs to $1200 for a TCM replacement.

Can I drive my car with U071C or should I stop immediately?

Driving with U071C is risky. While you might be able to drive at low speeds, the vehicle could enter limp mode, which can leave you stranded. It's best to address this code promptly to avoid further damage.

How can I diagnose U071C myself using GeekOBD APP?

Using the GeekOBD APP, start by connecting it to your vehicle's OBD-II port. Run a full system scan to retrieve codes and freeze frame data. Analyze the data to see the conditions under which the U071C code triggered, and check for any additional related codes that could give more insight.

What vehicles are most commonly affected by U071C?

DTC U071C is frequently seen in vehicles like the 2015-2018 Ford F-150, as well as other models from Ford and some GM vehicles produced around the same period. Always check for any recalls or TSBs related to transmission control issues.

How can I prevent U071C from happening again?

To prevent U071C, ensure regular maintenance of your vehicle's transmission system. This includes timely fluid changes, checking for wiring integrity, and addressing any warning lights immediately to prevent escalation of issues.

What is U071C?

DTC U071C is a diagnostic trouble code that indicates an issue with the communication between the transmission control module (TCM) and other vehicle systems. Specifically, this code means that the TCM has detected a fault in the CAN bus communication, which can lead to transmission performance problems. When this code triggers, it often results in the vehicle experiencing difficulties such as erratic shifting, or in some cases, the transmission may go into 'limp mode' to protect itself from further damage. Commonly seen in vehicles like the 2015-2018 Ford F-150, U071C can prevent smooth driving and may lead to more serious issues if not addressed promptly. Drivers may notice symptoms such as a check engine light illuminating, or they might experience stalling or hesitation during gear changes. It’s important to understand that while U071C can often be resolved with a simple repair, ignoring it can lead to increased repair costs down the line as transmission components may wear out faster due to improper functioning. Addressing U071C early can save you from significant headaches and expenses down the road.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U071C is present:

  • The check engine light stays on constantly, indicating a communication fault that could affect performance.
  • Drivers may experience engine hesitation during acceleration, especially when shifting gears, making driving feel less responsive.
  • Fuel economy may decrease by 10-15%, as the erratic transmission performance can lead to inefficient engine operation.
  • Transmission may enter limp mode, where it restricts functionality to prevent damage, making the car difficult to drive.
  • Unusual noises, such as grinding or whining from the transmission, which can indicate underlying mechanical issues.

Possible Causes

Most common causes of U071C (ordered by frequency):

  1. The most common cause is faulty wiring or connections in the CAN bus system, with an estimated likelihood of about 60%. Damaged wires can disrupt essential communication.
  2. A second cause could be a malfunctioning transmission control module (TCM), which may fail due to software issues or internal faults, accounting for approximately 25% of cases.
  3. A third cause is low transmission fluid levels or dirty fluid, which can lead to overheating and affect communication; keeping up with regular maintenance can help prevent this.
  4. Less common but serious causes include a failed engine control module (ECM), which can lead to significant operational issues if not diagnosed and repaired.
  5. A rare cause might be a software glitch that requires a reprogramming of the TCM or related components to resolve the communication errors.

U071C Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing or replacing damaged wiring in the CAN bus system.

  • Total: $100 - $300
  • Success rate: 80%
Transmission Control Module Replacement

Replacing a faulty TCM with a new or refurbished unit.

  • Total: $500 - $1200
  • Success rate: 90%
Fluid Change and Flush

Changing the transmission fluid and flushing the system to remove contaminants.

  • Total: $150 - $300
  • Success rate: 70%
Money-Saving Tips for U071C
  • 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 U071C Diagnosis Process

Follow these systematic steps to accurately diagnose U071C. 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, focusing on the TCM and wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on 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 and clear codes, ensuring the issue has been resolved (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes, ensuring the issue has been resolved (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 monitor for any reoccurrence of the code (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any reoccurrence of the code (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: Transmission Control Module Replacement on 2017 Ford F-150

Vehicle: 2017 Ford F-150, 45,000 miles

Problem: The customer reported erratic shifting and the check engine light was on.

Diagnosis: After running a diagnostic scan, the U071C code was retrieved. A visual inspection of the wiring showed no damage, but testing confirmed a faulty TCM.

Solution: The TCM was replaced with a refurbished unit, and the vehicle was reprogrammed.

Cost: $950 (including parts and labor)

Result: The vehicle shifted smoothly post-repair, and the check engine light was cleared.

Case Study 2: Wiring Repair on 2016 Chevrolet Silverado

Vehicle: 2016 Chevrolet Silverado, 60,000 miles

Problem: The customer experienced hesitation during acceleration and the vehicle occasionally entered limp mode.

Diagnosis: Diagnostic testing revealed the U071C code. A thorough wiring inspection found a damaged CAN bus wire.

Solution: The damaged wire was repaired and connections were secured.

Cost: $150 (parts and labor)

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

Diagnose U071C

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: U071C
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes