Quick Answer
B0674 means: B0674 indicates a malfunction in the door lock control circuit.
Can I drive with B0674? Address it soon to avoid locking or unlocking issues.
Common Questions
What does B0674 mean and how does it affect my car?
B0674 indicates a problem with your vehicle's door lock control circuit. This can lead to your doors not locking or unlocking properly, which affects your vehicle's security and usability. If left unresolved, it could cause further electrical issues.
What are the most common causes of B0674 and how much does it cost to fix?
Common causes include a faulty door lock actuator, wiring issues, and defective switches. Repair costs can range from $100 to $300 depending on the specific issue and parts needed.
Can I drive my car with B0674 or should I stop immediately?
While it's generally safe to drive, you should address B0674 soon to avoid locking issues that could compromise your vehicle's security.
How can I diagnose B0674 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for the B0674 code, view freeze frame data, and assess the performance of the door lock system. It will guide you in checking the wiring and components for faults.
What vehicles are most commonly affected by B0674?
B0674 is often found in vehicles like the 2011-2018 Ford F-150 and 2014-2018 Chevrolet Silverado. It’s advisable to check for recalls or service bulletins related to this code.
How can I prevent B0674 from happening again?
Regularly inspect the door lock system for wear and tear, avoid using excessive force when locking or unlocking, and ensure that water does not enter the door panel.
What is B0674?
DTC B0674 refers to a diagnostic trouble code related to a malfunction in the door lock control circuit, particularly affecting vehicles from manufacturers like Ford and Chevrolet. This code is usually triggered when the vehicle's onboard diagnostic system detects an abnormal voltage or resistance in the door lock actuator circuit. When this occurs, the power door locks may not function properly, leading to inconvenience and potential security issues. The implications of this code can range from simple issues, like a faulty switch or actuator, to more complex wiring problems. For instance, owners may notice that their car doors won't lock or unlock using the remote or the interior buttons. This can be frustrating, especially in situations where safety or security is a concern. Additionally, ignoring this issue could lead to further electrical problems, impacting other systems within the vehicle. Understanding B0674 is crucial for car owners, as it can help them make informed decisions about repairs and maintenance, ensuring their vehicle remains secure and functional.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0674 is present:
- Check engine light stays on constantly, indicating a persistent issue with the door locking system.
- Power door locks fail to respond when using the key fob, leaving the vehicle vulnerable.
- Interior door lock switches do not function, making it difficult to secure the vehicle from inside.
- Unusual noises when operating door locks, which may indicate an actuator failure.
- Doors lock and unlock intermittently, creating uncertainty in vehicle security.
Possible Causes
Most common causes of B0674 (ordered by frequency):
- Faulty door lock actuator (60%) - This is the most common issue, where the actuator itself fails, preventing locks from operating correctly.
- Wiring issues (25%) - Damaged or corroded wiring in the door lock circuit can disrupt the electrical signals needed for proper operation.
- Defective door lock switch (10%) - A malfunctioning switch can fail to send the correct signals to lock or unlock the doors.
- Body control module malfunction (3%) - Rarely, the problem lies within the vehicle's body control module, which manages the locking system.
- Water damage (2%) - In some cases, water intrusion can affect wiring and components, leading to failures.
B0674 Repair Costs
Cost Breakdown by Repair Type
Door Lock Actuator Replacement
Replacing a faulty door lock actuator to restore locking functionality.
- Total: $150 - $300
- Success rate: 90%
Wiring Repair
Repairing damaged wiring in the door lock circuit to ensure proper signals.
- Total: $100 - $200
- Success rate: 85%
Money-Saving Tips for B0674
- 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 B0674 Diagnosis Process
Follow these systematic steps to accurately diagnose B0674. 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).
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).
Step 3: Step 3: Component testing - Use a multimeter to test suspected components like the door lock actuator and switches (20-30 minutes)
Step 3: Component testing - Use a multimeter to test suspected components like the door lock actuator and switches (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes).
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 F-150 Door Lock Issue
Vehicle: 2015 Ford F-150, 75,000 miles
Problem: Customer reported that the doors would not lock using the key fob.
Diagnosis: Diagnostic scan revealed code B0674, and visual inspection showed a damaged door lock actuator.
Solution: Replaced the door lock actuator and repaired any damaged wiring.
Cost: $250 (including parts and labor)
Result: Customer reported that the door lock functions were restored and worked perfectly after the repair.
Case Study 2: Chevrolet Silverado Wiring Repair
Vehicle: 2016 Chevrolet Silverado, 60,000 miles
Problem: Intermittent locking issues with the driver's side door.
Diagnosis: Found B0674 code; further inspection showed corroded wiring in the door harness.
Solution: Repaired the wiring and replaced the door lock switch.
Cost: $180 (including parts and labor)
Result: The locking system worked reliably after the repair.