U077A - Understanding the U077A Code for 2015-2018 Ford F-150 and Other Models

Quick Answer

U077A means: U077A indicates a communication failure in the power steering control module.

Fix: Check and replace faulty components Cost: $300 - $600 Time: 90-180 minutes

Can I drive with U077A? Immediate attention is recommended to ensure safe vehicle operation.

Common Questions

What does U077A mean and how does it affect my car?

The U077A code indicates a communication issue in the power steering system, which can lead to increased steering effort and potential safety risks, especially while driving at high speeds. Ignoring this code can result in further damage and more expensive repairs.

What are the most common causes of U077A and how much does it cost to fix?

Common causes include a malfunctioning power steering control module and damaged wiring. Repair costs can range from $100 for wiring repairs to $600 for module replacements.

Can I drive my car with U077A or should I stop immediately?

While you may be able to drive short distances, it's advisable to address the U077A code immediately. Continued driving can lead to safety hazards due to impaired steering.

How can I diagnose U077A myself using GeekOBD APP?

Using GeekOBD APP, you can scan for diagnostic codes, access freeze-frame data, and monitor real-time vehicle parameters to identify any anomalies in the power steering system.

What vehicles are most commonly affected by U077A?

Vehicles like the 2015-2018 Ford F-150, 2016-2018 Ford Explorer, and some models of the Lincoln MKX frequently experience the U077A code due to similar power steering system designs.

How can I prevent U077A from happening again?

Regular vehicle maintenance, including checking the wiring and connections in the power steering system, can help prevent the U077A code from recurring. Additionally, keeping software updated can prevent glitches.

What is U077A?

The Diagnostic Trouble Code (DTC) U077A indicates a communication issue between the vehicle's control modules, specifically related to the electric power steering (EPS) system. This code typically surfaces when the power steering control module fails to receive or send signals correctly to other systems, such as the engine control module (ECM) or body control module (BCM). This malfunction can lead to various symptoms affecting driving performance, including increased steering effort and the illumination of warning lights on the dashboard. For vehicle owners, especially those with 2015-2018 Ford F-150 models, it's crucial to understand that a U077A code can result in impaired steering response, making the vehicle more challenging to maneuver. Real-world implications include potential safety risks, especially when driving at high speeds or in tight conditions. If left unresolved, it can lead to further electrical issues within the vehicle, ultimately increasing repair costs and risking more significant system failures. Regular diagnostics can help identify this issue early, ensuring safe and reliable vehicle operation.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U077A is present:

  • The check engine light is illuminated, indicating a fault in the power steering communication.
  • Drivers may experience increased steering difficulty, particularly at low speeds, making it hard to maneuver.
  • Fuel economy may decrease significantly, often by 10-15%, due to the increased demand on the engine's resources.
  • Unusual noises from the steering column, such as whining or grinding, which may indicate mechanical issues.
  • In some cases, the power steering may fail entirely, leading to a loss of control while driving.

Possible Causes

Most common causes of U077A (ordered by frequency):

  1. The most common cause is a malfunctioning power steering control module, which has a likelihood of around 60%. This can occur due to electronic failures or software issues.
  2. Corroded or damaged wiring harnesses connecting the EPS system can also trigger the U077A code, as poor connections can prevent proper communication between modules.
  3. Improperly calibrated steering angle sensors may send incorrect data to the power steering module, leading to communication errors. Regular checks can prevent this.
  4. Less common but serious causes include software glitches in the vehicle's ECU that can affect multiple systems, requiring a software update.
  5. Rarely, a complete power steering pump failure or hydraulic issues can lead to symptoms resembling those of the U077A code.

U077A Repair Costs

Cost Breakdown by Repair Type

Power Steering Control Module Replacement

Replacing the faulty power steering control module with a new or refurbished unit.

  • Total: $300 - $600
  • Success rate: 85%
Wiring Repair

Repairing or replacing damaged wiring connections linked to the power steering system.

  • Total: $100 - $300
  • Success rate: 75%
Money-Saving Tips for U077A
  • 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 U077A Diagnosis Process

Follow these systematic steps to accurately diagnose U077A. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connectors, or corrosion around the power steering module

Step 1: Conduct an initial visual inspection to check for damaged wiring, loose connectors, or corrosion around the power steering module. This should take about 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: Use the GeekOBD APP to perform an OBD2 scan, retrieving all stored codes and freeze-frame data to gain context about the fault

Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all stored codes and freeze-frame data to gain context about the fault. This process usually takes 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: Test suspected components, including the power steering control module and wiring, using a multimeter or appropriate diagnostic tools

Step 3: Test suspected components, including the power steering control module and wiring, using a multimeter or appropriate diagnostic tools. Allocate about 20-30 minutes for this step.

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: After any repairs, conduct a system function test to ensure the power steering operates correctly and clear any stored codes in the system

Step 4: After any repairs, conduct a system function test to ensure the power steering operates correctly and clear any stored codes in the system. This can take around 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: Perform a road test under various driving conditions to confirm that the issue is resolved and that the vehicle handles properly, which can take about 15-20 minutes

Step 5: Perform a road test under various driving conditions to confirm that the issue is resolved and that the vehicle handles properly, which can take about 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: 2016 Ford F-150 U077A Repair

Vehicle: 2016 Ford F-150, 45,000 miles

Problem: Customer reported that the check engine light was on and experienced difficulty steering.

Diagnosis: After scanning with the GeekOBD APP, the U077A code was retrieved. A visual inspection revealed damaged wiring.

Solution: Repaired the damaged wiring and replaced the power steering control module.

Cost: $550 (includes $400 for parts and $150 for labor)

Result: The vehicle's steering response improved, and the check engine light was cleared without further issues.

Case Study 2: 2017 Lincoln MKX Power Steering Issue

Vehicle: 2017 Lincoln MKX, 30,000 miles

Problem: Customer noticed increased steering effort and warning lights on the dashboard.

Diagnosis: Diagnostic tests indicated a U077A code due to a faulty power steering control module.

Solution: Replaced the control module and updated the vehicle's software.

Cost: $600 (includes $500 for the module and $100 for labor)

Result: The steering was restored to normal operation, and the warning lights were resolved.

Diagnose U077A

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: U077A
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes