Quick Answer
B1520 means: B1520 indicates a fault in the air conditioning sensor circuit.
Can I drive with B1520? Immediate attention is recommended to prevent further A/C system damage.
Common Questions
What does B1520 mean and how does it affect my car?
The B1520 code indicates a malfunction in the air conditioning sensor circuit, which can lead to ineffective cooling and discomfort for passengers. If ignored, it may result in further damage to your A/C system, including the compressor.
What are the most common causes of B1520 and how much does it cost to fix?
Common causes include a faulty A/C sensor, wiring issues, or a malfunctioning control module. Repair costs typically range from $100 for wiring repairs to $600 for control module replacement, depending on the specific issue.
Can I drive my car with B1520 or should I stop immediately?
While you can technically drive with the B1520 code present, it's advisable to address the issue promptly to avoid discomfort and potential damage to the A/C system, especially in hot weather.
How can I diagnose B1520 myself using GeekOBD APP?
You can use the GeekOBD APP to scan for codes, read freeze frame data, and monitor live sensor data to pinpoint the issue. Look for discrepancies in A/C sensor readings to aid your diagnosis.
What vehicles are most commonly affected by B1520?
The B1520 code is frequently reported in 2013-2018 Honda Accord and 2014-2019 Ford Fusion models, among others. Be sure to check for any related recalls or Technical Service Bulletins (TSBs).
How can I prevent B1520 from happening again?
Regular maintenance of your A/C system, including checking and repairing wiring and ensuring refrigerant levels are adequate, can help prevent the B1520 code from reoccurring.
What is B1520?
The Diagnostic Trouble Code (DTC) B1520 indicates an issue with the air conditioning system, specifically related to the sensor circuit. This code is commonly found in various vehicles, including 2013-2018 Honda Accord and 2014-2019 Ford Fusion models. When the B1520 code is triggered, it typically signifies that the vehicle's onboard diagnostic system has detected a malfunction in the signal from the air conditioning sensor, which can prevent the A/C system from functioning correctly. This could lead to issues such as the A/C not blowing cold air, increased humidity inside the vehicle, or even a complete failure of the air conditioning system. In simpler terms, if you're experiencing cooling problems, the B1520 code might be the culprit. Ignoring this code can lead to further complications, such as damage to the A/C compressor or other related components, and may also affect overall vehicle comfort, especially during hot weather. As such, it's crucial to address the B1520 code promptly to ensure your vehicle's A/C system operates efficiently.
System: B - Body (Airbags, Lighting, Security, Climate Control)
Symptoms
Common symptoms when B1520 is present:
- The check engine light illuminates, indicating a potential issue with the A/C system.
- Air conditioning fails to provide cold air, leaving passengers uncomfortable during hot weather.
- Unusual noises may be heard when the A/C is activated, suggesting a mechanical problem.
- Increased humidity inside the vehicle, which can indicate improper A/C operation.
- The A/C compressor may not engage, resulting in a complete lack of cooling.
Possible Causes
Most common causes of B1520 (ordered by frequency):
- Faulty air conditioning sensor - This is the most common cause, occurring in approximately 60% of cases. A malfunctioning sensor can provide incorrect readings to the vehicle's computer.
- Wiring issues - Damaged or corroded wiring can lead to poor connectivity, causing the sensor to fail. Regular inspections can help prevent this.
- Faulty A/C control module - In about 15% of cases, the control module itself may be the issue, requiring specialized testing to confirm.
- Refrigerant leaks - Less common but serious, a refrigerant leak can cause the A/C system to operate improperly, leading to sensor errors.
- Failed A/C compressor - Although rare, a failing compressor can affect sensor performance and should be checked if other causes are ruled out.
B1520 Repair Costs
Cost Breakdown by Repair Type
Air Conditioning Sensor Replacement
Replace the faulty A/C sensor that is causing the B1520 code.
- Total: $150 - $250
- Success rate: 85%
Wiring Repair
Repair or replace damaged wiring in the A/C system.
- Total: $100 - $200
- Success rate: 75%
Control Module Replacement
Replace the faulty A/C control module if other diagnostics point to its failure.
- Total: $300 - $600
- Success rate: 70%
Money-Saving Tips for B1520
- 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 B1520 Diagnosis Process
Follow these systematic steps to accurately diagnose B1520. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Initial visual inspection - Begin by checking for obvious signs of damage to the A/C wiring harness and connections (5-10 minutes)
Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all trouble codes and freeze frame data, providing context for the B1520 code (10-15 minutes)
Step 3: Component testing - Test the air conditioning sensor using a multimeter to ensure it is operating within specifications (20-30 minutes)
Step 4: System function test - After any repairs, verify the proper operation of the A/C system and clear codes using the GeekOBD APP (10-15 minutes)
Step 5: Road test verification - Drive the vehicle under different conditions to confirm that the A/C is functioning 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: A/C Sensor Replacement in 2015 Honda Accord
Vehicle: 2015 Honda Accord, 65,000 miles
Problem: Customer reported that the A/C was blowing warm air and the check engine light was on.
Diagnosis: Performed a scan with the GeekOBD APP, retrieved B1520 code, and conducted a visual inspection, revealing a faulty A/C sensor.
Solution: Replaced the A/C sensor and cleared the DTC.
Cost: $200 (sensor cost: $150, labor: $50)
Result: A/C was restored to full functionality, and the customer reported satisfaction with the repair.
Case Study 2: Wiring Repair in 2017 Ford Fusion
Vehicle: 2017 Ford Fusion, 45,000 miles
Problem: Customer complained of intermittent A/C failure and a persistent check engine light.
Diagnosis: Used the GeekOBD APP to identify the B1520 code, then performed a wiring inspection, finding corrosion in the connector.
Solution: Repaired the corroded wiring and reconnected the sensor.
Cost: $120 (labor: $100, materials: $20)
Result: The A/C system functioned normally post-repair, with no further codes.