Quick Answer
B0371 means: B0371 signifies a malfunction in the rear passenger door latch circuit, often linked to the body control module's feedback system.
Can I drive with B0371? It is advisable to address this issue promptly to avoid potential safety and security risks.
Common Questions
What does B0371 mean and how does it affect my car?
B0371 indicates a malfunction in the rear passenger side door latch circuit, which can compromise the safety and security of your vehicle. If the door latch fails to operate correctly, it may prevent you from locking or unlocking your door, impacting accessibility for passengers and increasing the risk of theft.
What are the most common causes of B0371 and how much does it cost to fix?
Common causes of B0371 include a faulty door latch, damaged wiring, or a malfunctioning BCM. Repair costs can vary, with latch replacements typically ranging from $150 to $300, while wiring repairs may be more affordable at $50 to $150.
Can I drive my car with B0371 or should I stop immediately?
While it may be possible to drive with B0371, doing so is not recommended due to potential safety risks. A malfunctioning door latch can lead to accessibility issues or allow unauthorized access to your vehicle, so it’s best to address the problem promptly.
How can I diagnose B0371 myself using GeekOBD APP?
To diagnose B0371 with the GeekOBD APP, connect the device to your vehicle's OBD2 port, run a scan to retrieve the code, and check the freeze frame data for context. You can then perform visual inspections and component tests based on the information gathered.
What vehicles are most commonly affected by B0371?
DTC B0371 is often reported in models like the 2015-2018 Honda Civic, 2016-2018 Toyota Corolla, and certain Ford models. It's advisable to check for any recalls or Technical Service Bulletins (TSBs) related to door latch issues in these vehicles.
How can I prevent B0371 from happening again?
To prevent B0371 from recurring, regularly inspect and maintain your vehicle's door latches, keeping them clean and free from debris. Ensure that electrical connections are secure and consider applying protective coatings to vulnerable wiring.
What is B0371?
DTC B0371 indicates a fault in the rear passenger side door latch circuit. This code typically arises when the body control module (BCM) detects a malfunction in the latch's feedback system, which is crucial for ensuring the door locks and unlocks correctly. This issue can prevent the door from functioning properly, leading to safety concerns and potential vehicle security risks. For example, if the rear door latch is stuck in the locked position, it may not open, creating accessibility issues for passengers. Conversely, if it fails to lock, it could pose a security threat, allowing unauthorized access to the vehicle. Understanding the implications of DTC B0371 is vital for car owners, especially those with 2015-2018 Honda Civics and similar models, as it can influence both safety and convenience. Immediate attention can prevent further complications and costs associated with door malfunction, such as damaged wiring or issues with the BCM itself, which can escalate repair costs significantly. Regular maintenance checks can help identify such issues early, ensuring the door latch operates as intended and enhancing overall vehicle reliability.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0371 is present:
- Check engine light remains illuminated, indicating an ongoing issue with the door latch system.
- Rear passenger door fails to lock or unlock properly, leading to accessibility issues for passengers.
- Unusual noises from the door area when attempting to lock or unlock, suggesting mechanical failure.
- Inconsistent operation of the door latch, which may intermittently work but often fails.
- Difficulty in opening the rear door from the inside, indicating a potential latch malfunction.
Possible Causes
Most common causes of B0371 (ordered by frequency):
- The most common cause is a faulty door latch assembly, which accounts for about 60% of B0371 cases. This can be due to wear and tear or physical damage.
- A second common cause is damaged wiring or connectors in the latch circuit, which can interrupt the signal between the latch and the BCM.
- Corrosion in the door latch mechanism may also lead to failure, often preventable through regular maintenance and cleaning.
- A less common but serious cause is a malfunctioning body control module, which could misinterpret signals and lead to multiple issues across the vehicle's electrical systems.
- Rarely, this code may appear due to software glitches within the BCM, necessitating a software update to resolve.
B0371 Repair Costs
Cost Breakdown by Repair Type
Door Latch Assembly Replacement
Replacing the faulty door latch assembly with an OEM or aftermarket part.
- Total: $150 - $300
- Success rate: 85%
Wiring Repair
Repairing damaged wiring or connectors that affect the latch circuit.
- Total: $50 - $150
- Success rate: 70%
Money-Saving Tips for B0371
- 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 B0371 Diagnosis Process
Follow these systematic steps to accurately diagnose B0371. 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 the continuity of the door latch and associated wiring (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the continuity of the door latch and associated wiring (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation of the door latch after any repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation of the door latch after any repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the latch functions correctly (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the latch functions correctly (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: Honda Civic Door Latch Repair
Vehicle: 2017 Honda Civic, 45,000 miles
Problem: Customer reported that the rear passenger door would not lock.
Diagnosis: After scanning the vehicle, DTC B0371 was found. A visual inspection revealed a damaged door latch assembly.
Solution: Replaced the door latch assembly with an OEM part and reconnected all wiring.
Cost: $250 (parts: $200, labor: $50)
Result: The door now locks and unlocks correctly, and the customer reported satisfaction with the repair.
Case Study 2: Toyota Corolla Wiring Issue
Vehicle: 2016 Toyota Corolla, 30,000 miles
Problem: Customer experienced intermittent locking of the rear door.
Diagnosis: DTC B0371 was confirmed, and further inspection showed corroded wiring in the latch circuit.
Solution: Repaired the wiring and cleaned connections to ensure proper electrical flow.
Cost: $100 (parts: $20, labor: $80)
Result: The rear door now operates smoothly, and the customer expressed relief at the low repair cost.