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Engine-Codes – Generic – B120B

B120B Code - Passenger Seat Back Temperature Sensor

Quick Answer

The B120B diagnostic trouble code (DTC) specifically refers to the Passenger Seat Back Temperature Sensor in a vehicle. Common causes include Faulty passenger seat back temperature sensor, Wiring or connection issues related to the sensor, Corrosion or damage to the sensor components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B120B indicates Passenger Seat Back Temperature Sensor.
Common causes
Common causes include Faulty passenger seat back temperature sensor, Wiring or connection issues related to the sensor, Corrosion or damage to the sensor components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code B120B Description

The B120B diagnostic trouble code (DTC) specifically refers to the Passenger Seat Back Temperature Sensor in a vehicle. This sensor is responsible for monitoring the temperature of the passenger seat back to ensure comfort and safety for the occupants. When this sensor malfunctions or fails, it can lead to issues with the climate control system and potentially impact the overall comfort of the passenger.

OBDII Code B120B - Passenger Seat Back Temperature Sensor
B120B Code - Passenger Seat Back Temperature Sensor

Common Causes of B120B

  1. Faulty passenger seat back temperature sensor.
  2. Wiring or connection issues related to the sensor.
  3. Corrosion or damage to the sensor components.
  4. Electrical issues within the climate control system.
  5. Environmental factors such as extreme temperature variations affecting sensor performance.

Symptoms of B120B

  1. Warning light on the dashboard indicating an issue with the passenger seat back temperature sensor.
  2. Inaccurate temperature readings on the climate control system.
  3. Inconsistent heating or cooling of the passenger seat back.
  4. Climate control system not responding to changes in temperature settings.
  5. Uncomfortable passenger experience due to temperature discrepancies.

How to Fix B120B

  1. Start by diagnosing the specific issue with the passenger seat back temperature sensor using a diagnostic scanner to retrieve the fault code.
  2. Inspect the sensor and its wiring for any visible damage or corrosion. Repair or replace any damaged components as needed.
  3. Test the sensor's functionality by applying heat or cold to the seat back and checking for accurate temperature readings on the climate control system.
  4. Clear the fault code from the vehicle's computer system using the diagnostic scanner.
  5. Test drive the vehicle to ensure that the issue has been resolved and that the warning light no longer appears on the dashboard.

Cost to Fix B120B

The typical repair costs for addressing a B120B code related to the Passenger Seat Back Temperature Sensor can vary depending on the make and model of the vehicle, as well as the location of the repair shop. On average, the parts for this repair may cost between $50 to $200, while the labor costs can range from $100 to $300. It's important to note that these are rough estimates, and actual costs may differ based on the specific circumstances of the repair. Additionally, factors such as diagnostic time and labor rates at the auto repair shop can impact the final cost of the repair. It's recommended to consult with a qualified mechanic or repair shop for a more accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for B120B

B120B:01 Passenger Seat Back Temperature Sensor General Electrical Failure

B120B:98 Passenger Seat Back Temperature Sensor Component or System Over Temperature

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Code B120B Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B120B Code

1. What are the common symptoms of OBDII code B120B (Passenger Seat Back Temperature Sensor)?

- The common symptoms include inaccurate temperature readings on the passenger seat back, malfunctioning climate control system, and potential activation of the airbag warning light.

2. What are the possible causes of OBDII code B120B?

- The code B120B typically indicates a faulty passenger seat back temperature sensor, damaged wiring or connections related to the sensor, or a problem with the climate control module.

3. How can I diagnose the issue related to OBDII code B120B?

- To diagnose the issue, you can use an OBDII scanner to read the code, visually inspect the wiring and sensor connections for any damage, and perform a sensor resistance test to check its functionality.

4. Can OBDII code B120B be fixed without professional help?

- Depending on your automotive knowledge and skills, you may be able to fix the issue related to OBDII code B120B by replacing the faulty sensor or repairing damaged wiring. However, seeking professional help is recommended for accurate diagnosis and repair.

5. How much does it typically cost to repair OBDII code B120B?

- The cost of repairing OBDII code B120B can vary depending on the underlying cause, the cost of parts, and labor rates. On average, the repair cost can range from $100 to $300, but this is just an estimate.

6. Are there any temporary fixes for OBDII code B120B?

- There are usually no recommended temporary fixes for OBDII code B120B, as it is essential to address the root cause of the issue to ensure proper functioning of the passenger seat back temperature sensor.

7. Can OBDII code B120B affect the overall performance of the vehicle?

- While OBDII code B120B is related to the passenger seat back temperature sensor and climate control system, it may not directly impact the overall performance of the vehicle. However, it can affect passenger comfort and safety.

8. Is it safe to drive with OBDII code B120B present?

- It is generally safe to drive with OBDII code B120B present, but it is recommended to address the issue promptly to avoid potential issues with the climate control system and passenger safety features.

9. How long does it typically take to repair OBDII code B120B?

- The repair time for OBDII code B120B can vary depending on the complexity of the issue and the availability of parts. In most cases, a skilled mechanic can complete the repair within a few hours to a day.

10. Can OBDII code B120B reappear after being repaired?

- If the root cause of OBDII code B120B is not properly addressed during repair, there is a possibility that the code may reappear. It is crucial to ensure a thorough diagnosis and repair to prevent recurrence.

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