U07AC - Understanding the Network Communication Error in 2016-2020 Ford Vehicles

Quick Answer

U07AC means: U07AC signifies a communication error in the vehicle's control modules, often affecting system performance.

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

Can I drive with U07AC? Immediate attention is recommended to prevent further issues.

Common Questions

What does U07AC mean and how does it affect my car?

The U07AC code indicates a communication error between your vehicle's control modules, leading to potential issues in engine and transmission performance. If left unresolved, it can result in decreased efficiency and reliability.

What are the most common causes of U07AC and how much does it cost to fix?

Common causes include damaged wiring and software glitches, with repair costs ranging from $100 to $800, depending on whether you need a simple fix or a full module replacement.

Can I drive my car with U07AC or should I stop immediately?

While you may be able to drive your car, it's recommended to address the U07AC code promptly. Continuing to drive with this code can lead to further damage and potentially unsafe driving conditions.

How can I diagnose U07AC myself using GeekOBD APP?

Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the U07AC code and any related codes. Look for freeze-frame data and any other logged issues to help pinpoint the source of the problem.

What vehicles are most commonly affected by U07AC?

The U07AC code is frequently seen in 2016-2020 Ford Explorer and Ford F-150 models, with reports of similar issues in other Ford vehicles from that era.

How can I prevent U07AC from happening again?

Regular maintenance, such as checking wiring connections and keeping the software of your vehicle's control modules updated, can help prevent U07AC from recurring.

What is U07AC?

The diagnostic trouble code (DTC) U07AC indicates an issue with communication between various controllers in the vehicle. This code is particularly relevant to certain Ford models, including the 2016-2020 Ford Explorer and the 2017-2020 Ford F-150, which may experience problems with their vehicle control modules. When this code appears, it typically signifies that there is a failure in the communication network, which could lead to malfunctions in critical systems such as the engine, transmission, or safety features. This communication breakdown may occur due to a variety of reasons, including damaged wiring, poor connections, or even software issues within the modules themselves. For car owners, the implications of a U07AC code can be significant, as it can lead to decreased performance, increased fuel consumption, and potential safety hazards. Ignoring this code may not only worsen the problem but could also lead to more severe damage to the vehicle’s electronic systems, requiring costly repairs. It's essential to address this code promptly to ensure your vehicle operates smoothly and safely.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U07AC is present:

  • The check engine light may illuminate, indicating a problem with the vehicle's diagnostic systems.
  • You might experience erratic engine behavior, such as stalling or difficulty starting, which can be frustrating during daily commutes.
  • Fuel economy may decrease noticeably, with reports of a 10-15% drop in efficiency, leading to higher fuel expenses.
  • The vehicle may also exhibit issues with transmission shifting, making it feel like it's struggling to find the correct gear.
  • In some cases, you may notice that certain safety features, like traction control or ABS, are malfunctioning or disabled.

Possible Causes

Most common causes of U07AC (ordered by frequency):

  1. The most common cause of the U07AC code is damaged wiring or connectors within the vehicle’s communication network, with a likelihood of about 40%. This can happen due to wear and tear or exposure to moisture.
  2. Another frequent cause is software glitches within the vehicle's control modules, which can occur after updates or repairs. This has a 30% likelihood.
  3. Faulty control modules themselves can also trigger this code, making up about 20% of cases. Regular software updates and checks can help prevent this.
  4. Less common, but serious issues like water intrusion into the control module can occur, particularly in vehicles exposed to heavy rain or flooding.
  5. In rare cases, complete failure of the communication network itself can happen, usually due to extensive electrical damage or factory defects.

U07AC Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing damaged wiring or connectors in the communication network.

  • Total: $100 - $300
  • Success rate: 85%
Control Module Reprogramming

Reprogramming or updating software in control modules.

  • Total: $50 - $150
  • Success rate: 70%
Control Module Replacement

Replacing faulty control modules that are causing communication failures.

  • Total: $300 - $800
  • Success rate: 90%
Money-Saving Tips for U07AC
  • 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 U07AC Diagnosis Process

Follow these systematic steps to accurately diagnose U07AC. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Conduct an initial visual inspection to check for obvious signs of damage, such as frayed wires or corroded connectors (5-10 minutes)

Step 1: Conduct an initial visual inspection to check for obvious signs of damage, such as frayed wires or corroded connectors (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 current and stored codes along with freeze-frame data to better understand the fault context (10-15 minutes)

Step 2: Use the GeekOBD APP to perform an OBD2 scan, retrieving all current and stored codes along with freeze-frame data to better 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: Test suspected components, including wiring and connectors, using a multimeter or specialized diagnostic tools to identify any faults (20-30 minutes)

Step 3: Test suspected components, including wiring and connectors, using a multimeter or specialized diagnostic tools to identify any faults (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: After repairs, perform a system function test to ensure all components are operating correctly and clear the codes (10-15 minutes)

Step 4: After repairs, perform a system function test to ensure all components are operating correctly and clear the codes (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: Conduct a road test under various driving conditions to confirm that the issue has been resolved and there are no lingering symptoms (15-20 minutes)

Step 5: Conduct a road test under various driving conditions to confirm that the issue has been resolved and there are no lingering symptoms (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: 2017 Ford Explorer - Communication Failure Repair

Vehicle: 2017 Ford Explorer, 65,000 miles

Problem: Customer reported engine misfires and check engine light illumination.

Diagnosis: Diagnostic scan revealed U07AC and several related codes indicating communication issues.

Solution: Repaired a damaged wiring harness and reprogrammed control modules.

Cost: $350 (includes $200 for wiring repair, $150 for reprogramming)

Result: After repairs, the vehicle's performance improved, and all warning lights were cleared.

Case Study 2: 2018 Ford F-150 - Control Module Replacement

Vehicle: 2018 Ford F-150, 40,000 miles

Problem: Owner experienced erratic shifting and check engine light.

Diagnosis: U07AC code was retrieved, along with others indicating module faults.

Solution: Replaced the transmission control module and performed necessary programming.

Cost: $600 (module cost $500, labor $100)

Result: The vehicle now shifts smoothly, and the check engine light has not returned.

Diagnose U07AC

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
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  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: U07AC
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes