Quick Answer
B0671 means: B0671 indicates an issue with the air conditioning system's control module or switch.
Can I drive with B0671? It's advisable to address this code soon to prevent further damage to the AC system.
Common Questions
What does B0671 mean and how does it affect my car?
B0671 indicates a malfunction in your car's air conditioning system, which can lead to ineffective cooling and increased engine load if not addressed promptly.
What are the most common causes of B0671 and how much does it cost to fix?
The most common causes include a faulty control module, defective switch, or damaged wiring, with repair costs ranging from $100 to $600 depending on the issue.
Can I drive my car with B0671 or should I stop immediately?
While you can drive your vehicle, it's advisable to get it checked soon to prevent potential damage to the AC system and ensure comfort.
How can I diagnose B0671 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for trouble codes, view freeze frame data, and monitor real-time sensor readings to identify the issue.
What vehicles are most commonly affected by B0671?
This code is frequently found in 2015-2020 Ford F-150 models, but it can also appear in various other makes and models with electronic AC controls.
How can I prevent B0671 from happening again?
Regular maintenance, including checking and replacing worn components and ensuring electrical connections are clean, can help prevent future occurrences of B0671.
What is B0671?
DTC B0671 indicates a problem related to the air conditioning system, specifically the control module or the air conditioning switch. This trouble code suggests that the vehicle’s onboard diagnostic system has detected an issue that may affect the AC’s ability to function properly. In practical terms, this can mean that your air conditioning might not cool efficiently or may stop working altogether, leading to discomfort, especially in warmer climates. The system is designed to monitor various inputs, and when discrepancies occur—like a faulty switch or a malfunctioning control module—the B0671 code is triggered. This code is particularly common in vehicles like the 2015-2020 Ford F-150, where the integration of electronic controls is more complex. Ignoring this code can lead to further damage to the AC system and potentially impact other vehicle functions, making timely diagnosis and repair essential for maintaining comfort and vehicle performance.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B0671 is present:
- The check engine light may illuminate, signaling the need for immediate attention to your AC system.
- You may notice that the air conditioning does not cool the cabin effectively, leading to discomfort during drives, especially in hot weather.
- Drivers often report an unusual increase in engine load, which can be felt as a decrease in overall vehicle performance.
- In some cases, strange noises might be heard from the AC unit, indicating a potential mechanical failure.
- You may also experience intermittent functionality, where the AC works sporadically, further complicating your comfort.
Possible Causes
Most common causes of B0671 (ordered by frequency):
- The most common cause of a B0671 code is a faulty AC control module, with around 60% likelihood. This can be due to electrical issues or internal failures.
- Another frequent culprit is a defective AC switch, responsible for sending signals to the control module. This can often be diagnosed through visual inspection and testing.
- Corroded or damaged wiring connections, which account for about 10% of cases, can interfere with signals between the switch and the control module, leading to this trouble code.
- Less commonly, a refrigerant leak can trigger B0671, as low refrigerant levels can impact system performance. Regular maintenance and checks can help prevent this.
- In rare instances, a malfunctioning compressor may also cause this code, necessitating a complete system inspection.
B0671 Repair Costs
Cost Breakdown by Repair Type
Control Module Replacement
Replacing the faulty AC control module to restore proper functionality.
- Total: $300 - $600
- Success rate: 85%
AC Switch Replacement
Replacing the damaged AC switch, often a quicker and cheaper fix.
- Total: $100 - $250
- Success rate: 75%
Wiring Repair
Repairing or replacing corroded wiring connections that may be affecting signal transmission.
- Total: $50 - $150
- Success rate: 70%
Money-Saving Tips for B0671
- 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 B0671 Diagnosis Process
Follow these systematic steps to accurately diagnose B0671. 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 or specific diagnostic tools to test the AC control module and switch (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the AC control module and switch (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 the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the 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: 2018 Ford F-150 AC Control Module Replacement
Vehicle: 2018 Ford F-150, 45,000 miles
Problem: Customer reported ineffective cooling from the AC system.
Diagnosis: An OBD2 scan revealed code B0671. Testing indicated a faulty control module.
Solution: Replaced the AC control module, restoring functionality.
Cost: $450 (parts: $300, labor: $150)
Result: AC system operated efficiently post-repair, and customer reported satisfaction.
Case Study 2: 2017 Honda Accord AC Switch Repair
Vehicle: 2017 Honda Accord, 30,000 miles
Problem: Driver experienced intermittent AC functionality.
Diagnosis: Code B0671 was triggered due to a defective AC switch.
Solution: Replaced the faulty switch, allowing reliable AC operation.
Cost: $150 (parts: $80, labor: $70)
Result: Customer was pleased with the quick resolution and improved AC performance.