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Engine-Codes – Generic – B2870

B2870 Code - Right Rear Tire Pressure Sensor Fault

Quick Answer

The B2870 code indicates a fault with the right rear tire pressure sensor in the vehicle's tire pressure monitoring system (TPMS). Common causes include Faulty right rear tire pressure sensor, Weak or dead battery in the sensor, Electrical interference affecting sensor communication. 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
B2870 indicates Right Rear Tire Pressure Sensor Fault.
Common causes
Common causes include Faulty right rear tire pressure sensor, Weak or dead battery in the sensor, Electrical interference affecting sensor communication.
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 16, 2024
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Code B2870 Description

The B2870 code indicates a fault with the right rear tire pressure sensor in the vehicle's tire pressure monitoring system (TPMS). The TPMS is designed to monitor the air pressure in each tire and alert the driver if there is a significant deviation from the recommended pressure. The right rear tire pressure sensor is responsible for transmitting data about the tire pressure to the vehicle's computer system. When this sensor malfunctions, it can lead to inaccurate tire pressure readings, potentially compromising the vehicle's safety and performance.

OBDII Code B2870 - Right Rear Tire Pressure Sensor Fault
B2870 Code - Right Rear Tire Pressure Sensor Fault

Common Causes of B2870

  1. Faulty right rear tire pressure sensor.
  2. Weak or dead battery in the sensor.
  3. Electrical interference affecting sensor communication.
  4. Physical damage to the sensor from road debris or impact.
  5. Corrosion or poor connection in the sensor's wiring.

Symptoms of B2870

  1. TPMS warning light illuminated on the dashboard.
  2. Inaccurate tire pressure readings displayed on the instrument cluster.
  3. Uneven tire wear on the right rear tire.
  4. Reduced fuel efficiency due to improper tire pressure.
  5. Handling and braking issues, especially on the right rear side of the vehicle.

How to Fix B2870

  1. Begin by confirming the diagnosis of a faulty right rear tire pressure sensor using a TPMS tool.
  2. Remove the right rear tire to access the sensor located inside the tire.
  3. Replace the faulty sensor with a new, compatible one.
  4. Reassemble the tire, ensuring proper installation of the new sensor.
  5. Reset the TPMS system and recalibrate the sensors to ensure accurate readings.

Cost to Fix B2870

The cost of repairing a right rear tire pressure sensor fault can vary depending on the make and model of the vehicle, as well as the specific sensor needed for replacement. On average, the parts for a new sensor can range from $50 to $100, while labor costs may add another $50 to $100. Therefore, the total repair cost could be between $100 and $200. It's important to note that these estimates are approximate and actual costs may differ based on individual circumstances and the rates of the auto repair shop. It's recommended to consult with a professional technician for a more accurate cost assessment.

What does this mean?

Tech Notes for B2870

When the tire pressure warning light comes on solid and message center displays LOW TIRE PRESSURE, check the air pressure of all tires and adjust to the specified cold pressure listed on vehicle certification label (found on drivers door or door pillar). Drive the vehicle at 20 mph (32 km/h) for at least 2 minutes. If the vehicle has been stationary for more than 30 minutes, a TPM sensor Activation procedure may be needed. When the tire pressure warning light flashes for 70 seconds and then remains illuminated, after bulb-check has been performed and message center displays warning messages, there is a malfunction in the TPM system.

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Code B2870 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 B2870 Code

1. What are the common symptoms of OBDII code B2870 (Right Rear Tire Pressure Sensor Fault)?

- The most common symptom is a warning light on the dashboard indicating an issue with the right rear tire pressure sensor.

2. What are the possible causes of OBDII code B2870?

- The code B2870 can be triggered by a faulty right rear tire pressure sensor, low tire pressure in the right rear tire, sensor communication issues, or wiring problems.

3. How can I diagnose the cause of OBDII code B2870?

- To diagnose the cause of code B2870, you can use an OBDII scanner to read the code, check the tire pressure in the right rear tire, inspect the sensor and its wiring for any visible damage, and perform a sensor relearn procedure.

4. Can I drive my vehicle with OBDII code B2870?

- It is generally safe to drive the vehicle with code B2870, but it is recommended to address the issue as soon as possible to ensure proper tire pressure monitoring functionality.

5. How can I repair OBDII code B2870?

- Repair options for code B2870 include replacing the right rear tire pressure sensor, correcting the tire pressure in the affected tire, checking and repairing any wiring issues, and performing a sensor relearn procedure.

6. Will resetting the OBDII code B2870 turn off the warning light?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue is not fixed, the light is likely to come back on once the system detects the fault again.

7. How much does it typically cost to repair OBDII code B2870?

- The cost of repairing code B2870 can vary depending on the cause of the issue, but it generally involves the cost of a new tire pressure sensor, any necessary wiring repairs, and labor charges for the repair work.

8. Can a DIY enthusiast fix OBDII code B2870 at home?

- Depending on the cause of the issue, DIY enthusiasts with the necessary tools and knowledge may be able to address code B2870 by replacing the tire pressure sensor, checking and repairing wiring, and performing a sensor relearn procedure.

9. Is it necessary to visit a dealership for OBDII code B2870 repair?

- While visiting a dealership is an option, independent auto repair shops and DIY enthusiasts can also address code B2870 effectively by following proper diagnostic and repair procedures.

10. How often does OBDII code B2870 occur in vehicles?

- OBDII code B2870 related to a right rear tire pressure sensor fault can occur in vehicles equipped with tire pressure monitoring systems, particularly in situations where the sensor or related components have issues.

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