B0146 - Understanding DTC B0146: Common in 2015-2018 Honda Civic and Other Models

Quick Answer

B0146 means: B0146 indicates a problem with the Ambient Temperature Sensor circuit in your vehicle's climate control system.

Fix: Check and replace faulty components Cost: $100 - $250 Time: 90-180 minutes

Can I drive with B0146? It's advisable to address this issue soon to avoid further HVAC complications.

Common Questions

What does B0146 mean and how does it affect my car?

The B0146 code indicates a problem with the Ambient Temperature Sensor circuit. This can lead to inadequate climate control, discomfort, and potential damage to your HVAC system if left unaddressed.

What are the most common causes of B0146 and how much does it cost to fix?

Common causes include a faulty sensor, damaged wiring, and ECU issues. Repair costs typically range from $100 to $800 depending on the necessary repairs.

Can I drive my car with B0146 or should I stop immediately?

While it’s generally safe to drive with the B0146 code, it is advisable to have it checked soon to prevent further HVAC issues and maintain comfort.

How can I diagnose B0146 myself using GeekOBD APP?

You can use the GeekOBD APP to read the trouble codes, check live data for the Ambient Temperature Sensor, and monitor the HVAC system's performance.

What vehicles are most commonly affected by B0146?

This code is commonly found in models like the 2015-2018 Honda Civic and various other vehicles with similar climate control systems.

How can I prevent B0146 from happening again?

Regularly inspect your vehicle’s electrical connections and climate control system, and address any signs of wear or corrosion promptly.

What is B0146?

DTC B0146 is a diagnostic trouble code associated with the air conditioning system, specifically indicating an issue with the Ambient Temperature Sensor circuit. This sensor plays a crucial role in ensuring that your vehicle's climate control system operates effectively by measuring the outside temperature. When the B0146 code is triggered, it often means that there is either a malfunctioning sensor, a problem with the wiring, or a failure in the electronic control unit (ECU) that processes the temperature readings. This can lead to inconsistent or faulty climate control performance, which may leave drivers facing discomfort during extreme weather conditions. For instance, in models like the 2015-2018 Honda Civic, drivers may notice that the air conditioning system does not cool properly, or the climate control settings behave erratically. Ignoring this code can lead to further complications, including potential damage to the HVAC system or increased energy consumption, leading to higher fuel costs. Addressing the B0146 code promptly is essential for maintaining both comfort and performance in your vehicle.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0146 is present:

  • The check engine light or HVAC warning light illuminates on the dashboard, signaling a need for inspection.
  • Inconsistent air conditioning performance; for example, the AC may not cool the cabin properly, especially during hot weather.
  • The cabin temperature gauge may read inaccurately, causing confusion over the actual temperature inside the vehicle.
  • Unusual noises from the climate control system, which could indicate a failing component related to the temperature sensor.
  • Increased fuel consumption due to the HVAC system working harder than necessary to maintain temperature settings.

Possible Causes

Most common causes of B0146 (ordered by frequency):

  1. Faulty Ambient Temperature Sensor (70% likelihood) - The most common reason for the B0146 code is a malfunctioning sensor itself, which may fail due to wear and tear over time.
  2. Wiring Issues (20% likelihood) - Damaged or corroded wiring connected to the temperature sensor can interrupt the signal sent to the ECU, triggering the code.
  3. ECU Malfunction (5% likelihood) - A less common cause is a failure in the vehicle's electronic control unit, which may misinterpret or fail to receive sensor data.
  4. Poor Ground Connection (3% likelihood) - A bad ground connection can disrupt the electrical flow, leading to incorrect readings from the sensor.
  5. External Factors (2% likelihood) - Extreme weather conditions, such as heavy rain or snow, can affect sensor performance and trigger the code.

B0146 Repair Costs

Cost Breakdown by Repair Type

Ambient Temperature Sensor Replacement

Replacing the faulty Ambient Temperature Sensor with a new OEM part.

  • Total: $100 - $250
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring connected to the temperature sensor.

  • Total: $50 - $150
  • Success rate: 85%
ECU Reprogramming

Reprogramming or replacing the ECU if it's determined to be the root cause of the issue.

  • Total: $300 - $800
  • Success rate: 75%
Money-Saving Tips for B0146
  • 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 B0146 Diagnosis Process

Follow these systematic steps to accurately diagnose B0146. 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).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the GeekOBD APP to retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Ambient Temperature Sensor for proper functionality (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the Ambient Temperature Sensor for proper functionality (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - After repairs, verify the proper operation of the HVAC system and clear codes using the GeekOBD APP (10-15 minutes)

Step 4: System function test - After repairs, verify the proper operation of the HVAC system and clear codes using the GeekOBD APP (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair was successful and that the B0146 code does not reappear (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm the repair was successful and that the B0146 code does not reappear (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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: 2017 Honda Civic B0146 Repair

Vehicle: 2017 Honda Civic, 45,000 miles

Problem: Customer reported inconsistent cooling from the air conditioning.

Diagnosis: Diagnosed B0146 code using the GeekOBD APP, indicating a faulty Ambient Temperature Sensor.

Solution: Replaced the faulty sensor and verified HVAC operation.

Cost: $150 (including parts and labor)

Result: Customer reported consistent cooling performance after the repair.

Case Study 2: 2016 Toyota Corolla B0146 Issue

Vehicle: 2016 Toyota Corolla, 60,000 miles

Problem: Driver complained of fluctuating temperatures from the climate control system.

Diagnosis: B0146 code retrieved; wiring issues were found during inspection.

Solution: Repaired damaged wiring and reconnected the sensor.

Cost: $130 (parts and labor included)

Result: Fluctuating temperatures resolved, customer satisfied with the repair.

Diagnose B0146

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
Download GeekOBD APP Get MOBD Adapter

Code Information

Code: B0146
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: MEDIUM
Category: Body Codes