Quick Answer
B0374 means: B0374 refers to a malfunction in the rear left door switch or its circuit.
Can I drive with B0374? It is advised to address this issue promptly to ensure vehicle security and functionality.
Common Questions
What does B0374 mean and how does it affect my car?
The B0374 code indicates an issue with the rear left door switch or its circuit, which can prevent the door from locking or unlocking properly. This affects the security of your vehicle and could lead to further electrical issues.
What are the most common causes of B0374 and how much does it cost to fix?
Common causes include a faulty door switch, damaged wiring, or corrosion. Repair costs can range from $100 for a simple switch replacement to $300 for wiring repairs.
Can I drive my car with B0374 or should I stop immediately?
While you can technically drive your vehicle, it is not advisable as the issue may compromise your car's security and functionality.
How can I diagnose B0374 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for codes, view freeze frame data, and perform live data diagnostics to pinpoint the exact issue with the door switch.
What vehicles are most commonly affected by B0374?
The B0374 code is frequently seen in 2015-2018 Honda Accord models, as well as other Honda vehicles from those years.
How can I prevent B0374 from happening again?
Regular maintenance checks, especially of electrical connections and switches, can help prevent the recurrence of the B0374 code.
What is B0374?
The diagnostic trouble code B0374 indicates a malfunction in the rear left door switch or its circuit. This code is particularly common in vehicles such as the 2015-2018 Honda Accord and several other Honda models equipped with power door locks and windows. When this code is triggered, it usually signifies that the Body Control Module (BCM) has detected an anomaly in the door switch signal, which may prevent the door from locking or unlocking properly. For car owners, this can lead to issues such as a door not responding to the remote or manual controls, or even the vehicle’s security system malfunctioning. Ignoring this code could lead to further electrical problems, affecting other components in the vehicle’s body control system. It’s crucial for vehicle safety and convenience to address this issue promptly, as it can compromise the locking mechanisms and security features of the car.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0374 is present:
- The check engine light illuminates consistently, indicating an ongoing issue with the door switch.
- The rear left door fails to lock or unlock using the key fob or manual switch, causing inconvenience.
- Driver experiences intermittent electrical issues, such as the window not operating properly, which can be both frustrating and dangerous.
- In some instances, the vehicle's alarm system may activate without reason, signaling an electrical fault.
- There may be noticeable delays in the response time of the door locks when using the remote.
Possible Causes
Most common causes of B0374 (ordered by frequency):
- The most common cause of the B0374 code is a faulty door switch, which has a likelihood of about 60%. This can happen due to wear and tear or exposure to moisture.
- A damaged wiring harness or loose connection in the door's electrical system is the second most common cause, accounting for approximately 25%. This can lead to intermittent signals being sent to the BCM.
- Corrosion at the connector points is a third potential cause, which can usually be prevented by regularly checking and maintaining the electrical connections.
- Less common but serious causes include a malfunctioning Body Control Module, which may require complete replacement.
- A rare cause might be internal faults within the switch mechanism itself, which could necessitate a more extensive diagnostic process.
B0374 Repair Costs
Cost Breakdown by Repair Type
Door Switch Replacement
Replacing the faulty rear left door switch to restore functionality.
- Total: $100 - $250
- Success rate: 90%
Wiring Harness Repair
Repairing or replacing damaged wiring in the door's electrical system.
- Total: $150 - $300
- Success rate: 85%
Money-Saving Tips for B0374
- 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 B0374 Diagnosis Process
Follow these systematic steps to accurately diagnose B0374. 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 at the door switch and connector points (5-10 minutes)
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion at the door switch and connector points (5-10 minutes).
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and history (10-15 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context and history (10-15 minutes).
Step 3: Step 3: Component testing - Use a multimeter to check the voltage and continuity of the door switch and wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter to check the voltage and continuity of the door switch and wiring (20-30 minutes).
Step 4: Step 4: System function test - After any repairs, verify the proper operation of the door switch and clear the codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - After any repairs, verify the proper operation of the door switch and clear the codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair has resolved the issue (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair has resolved the issue (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: 2016 Honda Accord - Door Lock Failure
Vehicle: 2016 Honda Accord, 45,000 miles
Problem: Customer reported that the rear left door would not lock using the key fob.
Diagnosis: Upon scanning, the B0374 code was confirmed. A visual inspection revealed corrosion on the door switch connector.
Solution: Replaced the rear left door switch and cleaned the connectors, resolving the issue.
Cost: $150 (parts: $50, labor: $100)
Result: Customer reported that the door locking mechanism works perfectly after the repair.
Case Study 2: 2017 Honda Civic - Intermittent Door Lock Issue
Vehicle: 2017 Honda Civic, 30,000 miles
Problem: Customer experienced intermittent issues with the rear left door lock.
Diagnosis: Found B0374 code; testing revealed a faulty wiring harness causing signal loss.
Solution: Replaced the wiring harness and performed a system check.
Cost: $220 (parts: $120, labor: $100)
Result: The door lock issue was fully resolved, and the customer was satisfied with the quick turnaround.