Quick Answer
B1681 means: DTC B1681 signals an issue with the keyless entry system, often related to the ignition key or key fob.
Can I drive with B1681? Addressing this code quickly is advisable to prevent further issues, such as being unable to start your vehicle.
Common Questions
What does B1681 mean and how does it affect my car?
DTC B1681 indicates a malfunction in the keyless entry system. This can lead to issues such as the car not starting, difficulty locking or unlocking doors, and the check engine light turning on. Addressing it promptly can prevent further complications.
What are the most common causes of B1681 and how much does it cost to fix?
Common causes include a weak key fob battery, damaged wiring, or a malfunctioning BCM. Repair costs can vary from as low as $10 for a battery replacement to $800 for BCM replacement.
Can I drive my car with B1681 or should I stop immediately?
While you can technically drive your car, it’s advisable to address the issue as it may lead to being unable to start your vehicle or lock/unlock the doors remotely.
How can I diagnose B1681 myself using GeekOBD APP?
Using the GeekOBD APP, you can retrieve diagnostic codes and freeze frame data, helping you identify the context of the issue. Check for any related codes and inspect the key fob battery.
What vehicles are most commonly affected by B1681?
DTC B1681 is frequently seen in Honda and Acura models, especially those manufactured between 2000 and 2016. Checking for recalls or Technical Service Bulletins (TSBs) may provide additional insight.
How can I prevent B1681 from happening again?
Regularly check and replace the key fob battery, inspect wiring for wear, and keep the keyless entry system clean to prevent issues.
What is B1681?
DTC B1681 indicates a problem with the vehicle's keyless entry system, specifically pointing to an issue with the ignition key or key fob. This trouble code is commonly found in various Honda and Acura models, typically from 2000 to 2016. When this code is triggered, it often means that the vehicle's onboard computer has detected a malfunction in the wireless communication between the key fob and the car's security system. Drivers may experience issues such as the inability to unlock the doors remotely, the engine not starting, or the check engine light illuminating. It's important to address this issue promptly, as it could indicate a failing key fob battery, damaged wiring, or even a malfunctioning Body Control Module (BCM). Ignoring this code may lead to further complications, including complete failure of the keyless entry system or security lockout, which can leave you stranded. Regularly checking the key fob battery and ensuring that the vehicle's electronic systems are functioning properly can help prevent this code from appearing.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B1681 is present:
- The check engine light illuminates, indicating a fault in the vehicle’s electronic systems.
- Key fob fails to unlock or lock the doors remotely, leading to convenience issues.
- The engine may not start at all, which can be frustrating and inconvenient for drivers.
- Inconsistent performance of the keyless entry system, such as delayed responses.
- Potential security system alerts, which may prevent the vehicle from starting.
Possible Causes
Most common causes of B1681 (ordered by frequency):
- The most common cause is a weak or dead key fob battery, which accounts for about 60% of cases. Replacing the battery is a simple fix that can resolve the issue.
- Another common cause is damaged wiring or connections within the keyless entry system. Corrosion or wear over time can disrupt communication between components.
- A malfunctioning Body Control Module (BCM) may pose a problem, although this is less frequent. Regular maintenance can help prevent this.
- In some cases, the ignition switch may be faulty, leading to DTC B1681. This can often be diagnosed with the right tools.
- Rarely, a complete failure of the keyless entry system may occur. This typically requires professional diagnosis and repair.
B1681 Repair Costs
Cost Breakdown by Repair Type
Key Fob Battery Replacement
Replacing the key fob battery is often the simplest and least expensive fix.
- Total: $10 - $30
- Success rate: 95%
Wiring Repair
Repairing damaged wiring or connections can resolve communication issues.
- Total: $50 - $150
- Success rate: 80%
BCM Replacement
Replacing a faulty Body Control Module can be costly but necessary if other fixes fail.
- Total: $300 - $800
- Success rate: 75%
Money-Saving Tips for B1681
- 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 B1681 Diagnosis Process
Follow these systematic steps to accurately diagnose B1681. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Perform an initial visual inspection of the key fob and wiring connections to check for obvious damage or corrosion (5-10 minutes)
Step 2: Use an OBD2 scanner, such as the GeekOBD APP, to retrieve the trouble code and any related codes, along with freeze frame data to understand the context (10-15 minutes)
Step 3: Test the key fob battery and replace it if necessary, ensuring it has the correct voltage (10-15 minutes)
Step 4: Conduct a continuity test on the wiring harness and connectors related to the keyless entry system (15-20 minutes)
Step 5: After repairs, perform a system function test to verify the proper operation of the keyless entry and clear the codes (10-15 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: Key Fob Battery Replacement in a 2012 Honda Accord
Vehicle: 2012 Honda Accord, 85,000 miles
Problem: Customer reported the key fob was not unlocking the doors.
Diagnosis: After using the GeekOBD APP, DTC B1681 was retrieved. A quick visual inspection revealed a dead key fob battery.
Solution: Replaced the key fob battery; the keyless entry system functioned properly afterward.
Cost: $20 (including labor and battery cost)
Result: The key fob now works perfectly, and the customer was satisfied with the quick fix.
Case Study 2: Wiring Repair on a 2004 Acura TL
Vehicle: 2004 Acura TL, 120,000 miles
Problem: Customer experienced intermittent keyless entry functionality.
Diagnosis: DTC B1681 was present; inspection revealed corroded wiring in the door harness.
Solution: Repaired the wiring and secured connections.
Cost: $100 (including parts and labor)
Result: The keyless entry system was restored to full functionality, improving customer satisfaction.