U0C74 - Understanding DTC U0C74: Common Issues in 2016-2020 Ford and Chevrolet Models

Quick Answer

U0C74 means: DTC U0C74 indicates a communication issue with the Body Control Module in your vehicle.

Fix: Check and replace faulty components Cost: $150 - $400 Time: 90-180 minutes

Can I drive with U0C74? It is advisable to address this issue promptly to avoid further complications.

Common Questions

What does U0C74 mean and how does it affect my car?

DTC U0C74 indicates a communication failure within your vehicle's electronic system, primarily involving the Body Control Module. If this code appears, you may notice issues with electronic features, erratic dashboard indicators, or even problems starting your vehicle. Ignoring this code could lead to more serious electrical problems, affecting the overall performance and safety of your car.

What are the most common causes of U0C74 and how much does it cost to fix?

Common causes include damaged wiring or connectors, malfunctioning BCM or CGM, and poor ground connections. Repair costs vary depending on the issue, typically ranging from $150 for wiring repairs to $800 for a BCM replacement. It's essential to address these issues promptly to avoid further complications.

Can I drive my car with U0C74 or should I stop immediately?

While you may be able to drive your vehicle with the U0C74 code, it's not advisable to ignore it. Continued use can exacerbate the issue, potentially leading to a complete electrical failure. Therefore, it’s best to have the problem diagnosed and repaired as soon as possible.

How can I diagnose U0C74 myself using GeekOBD APP?

To diagnose U0C74, connect the GeekOBD APP to your vehicle’s OBD2 port. Run a full system scan to retrieve codes and freeze frame data. Check for any other related codes that may provide additional context. Look for abnormal readings in voltage or communication errors among modules.

What vehicles are most commonly affected by U0C74?

DTC U0C74 is frequently reported in Ford models like the F-150 and Chevrolet models like the Silverado, especially those manufactured between 2016 and 2020. If you own a vehicle from this range, it’s crucial to be vigilant for any symptoms associated with this code.

How can I prevent U0C74 from happening again?

To prevent U0C74 from recurring, ensure regular maintenance of your vehicle's electrical system. Check wiring and connectors for signs of wear, keep the vehicle's software updated, and avoid aftermarket modifications that could introduce electrical issues.

What is U0C74?

The diagnostic trouble code (DTC) U0C74 indicates a problem with the vehicle's communication network, specifically related to the Body Control Module (BCM) or Central Gateway Module (CGM). This code is prevalent in various models of Ford and Chevrolet vehicles manufactured between 2016 and 2020. When U0C74 is triggered, it means that the BCM is unable to communicate with other control modules in the vehicle's network, which can lead to numerous issues, such as malfunctioning lights, erratic dashboard readings, and impaired vehicle features like remote start or keyless entry. This communication failure can arise due to damaged wiring, poor connections, or software glitches. As a result, drivers may experience symptoms such as warning lights on the dashboard, failure of electronic features, or even intermittent vehicle operation. Repairing this code often requires a thorough inspection of the vehicle’s electrical system, including wiring harnesses, connectors, and the modules themselves. It's crucial for car owners to address U0C74 promptly, as ignoring it can lead to further complications, including safety-related issues.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0C74 is present:

  • Check engine light stays on constantly, indicating a potential communication issue.
  • Electronic features such as power windows, door locks, or interior lights fail to operate correctly, affecting convenience.
  • Dashboard warning indicators behave erratically, which can confuse the driver about the vehicle's actual condition.
  • Remote start feature may fail to engage, limiting the convenience of starting the vehicle from a distance.
  • Intermittent issues with the vehicle's starting system, leading to difficulties when trying to start the engine.

Possible Causes

Most common causes of U0C74 (ordered by frequency):

  1. The most common cause of DTC U0C74 is damaged wiring or connectors, which occurs in about 60% of cases. This can happen due to wear and tear or exposure to moisture.
  2. Another significant cause is a malfunctioning BCM or CGM, which could be due to manufacturing defects or software issues. This situation accounts for about 25% of U0C74 occurrences.
  3. Poor ground connections can also trigger this code, as they can disrupt communication between modules. Regular maintenance checks can help prevent this issue.
  4. Less commonly, a complete failure of the vehicle's communication network can occur, leading to a no-start condition. This is a serious issue that needs immediate attention.
  5. In rare cases, external factors such as aftermarket modifications to the vehicle's electrical system can lead to conflicts and set off the U0C74 code.

U0C74 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair or replace damaged wiring and connectors to restore communication.

  • Total: $150 - $400
  • Success rate: 85%
BCM Replacement

Replacing a faulty Body Control Module if repairs are not feasible.

  • Total: $300 - $800
  • Success rate: 90%
Software Update

Updating the BCM or CGM software to fix communication bugs.

  • Total: $100 - $250
  • Success rate: 70%
Money-Saving Tips for U0C74
  • 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 U0C74 Diagnosis Process

Follow these systematic steps to accurately diagnose U0C74. 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 BCM and wiring harness (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on the BCM and wiring harness (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 using the GeekOBD APP (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (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 the successful repair and check for any recurring issues (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the successful repair and check for any recurring issues (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: Repair Case Study: 2018 Ford F-150 with U0C74 Code

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

Problem: Owner reported intermittent dashboard warnings and non-functioning power windows.

Diagnosis: Visual inspection revealed frayed wiring near the BCM, confirmed with GeekOBD APP diagnostics showing U0C74.

Solution: Repaired the frayed wiring and secured connections. Updated BCM software.

Cost: $350 (including parts and labor)

Result: All electronic features operated normally after repair, and no further issues were reported.

Case Study 2: Repair Case Study: 2019 Chevrolet Silverado with U0C74 Code

Vehicle: 2019 Chevrolet Silverado, 30,000 miles

Problem: Owner experienced issues with keyless entry and dashboard lights flickering.

Diagnosis: Diagnostic scan revealed U0C74 alongside other codes. Further testing indicated a faulty BCM.

Solution: Replaced the BCM and performed a system reset.

Cost: $600 (specific cost breakdown: BCM $400, labor $200)

Result: Keyless entry and all electrical systems functioned properly post-repair.

Diagnose U0C74

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: U0C74
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes