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B1B55 RAM Code - 1st Row Passenger Seat Belt Sensor Circuit High

Quick Answer

The B1B55 RAM diagnostic trouble code (DTC) specifically refers to the 1st Row Passenger Seat Belt Sensor Circuit High. Common causes include Damaged wiring or connectors in the seat belt sensor circuit, Faulty passenger seat belt sensor, Issues with the airbag control module. 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
B1B55 RAM indicates 1st Row Passenger Seat Belt Sensor Circuit High.
Common causes
Common causes include Damaged wiring or connectors in the seat belt sensor circuit, Faulty passenger seat belt sensor, Issues with the airbag control module.
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 17, 2024
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Code B1B55 RAM Description

The B1B55 RAM diagnostic trouble code (DTC) specifically refers to the 1st Row Passenger Seat Belt Sensor Circuit High. This code indicates that there is a high voltage condition detected in the sensor circuit of the passenger seat belt. The seat belt sensor is a crucial component of the vehicle's safety system, as it is responsible for detecting whether the passenger is wearing their seat belt. When this sensor circuit registers a high voltage, it typically means that there is a malfunction in the system, potentially leading to inaccurate readings or failure to detect when the seat belt is not properly fastened.

OBDII Code B1B55 RAM - 1st Row Passenger Seat Belt Sensor Circuit High
B1B55 RAM Code - 1st Row Passenger Seat Belt Sensor Circuit High

Common Causes of B1B55 RAM

  1. Damaged wiring or connectors in the seat belt sensor circuit.
  2. Faulty passenger seat belt sensor.
  3. Issues with the airbag control module.
  4. Corrosion or moisture in the sensor circuit.
  5. Impact or damage to the passenger seat affecting sensor operation.

Symptoms of B1B55 RAM

  1. Airbag warning light illuminated on the dashboard.
  2. Inaccurate or inconsistent readings from the passenger seat belt sensor.
  3. Failure of the airbag system to deploy in a collision.
  4. Audible warning chime indicating a problem with the seat belt system.

How to Fix B1B55 RAM

  1. Begin by conducting a thorough visual inspection of the seat belt sensor circuit, checking for any visible damage to wiring or connectors.
  2. Use a multimeter to test the voltage in the sensor circuit and identify the specific location of the high voltage condition.
  3. Replace any damaged wiring or connectors in the circuit, ensuring proper connections are made.
  4. If the issue persists, replace the passenger seat belt sensor itself to resolve the high voltage condition.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool to reset the system and ensure the repair was successful.

Cost to Fix B1B55 RAM

The typical repair costs for addressing a B1B55 RAM code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing damaged wiring or connectors may cost between $100 and $300, while replacing the passenger seat belt sensor could range from $200 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total repair bill could amount to several hundred dollars. It's important to note that these estimates are rough averages, and actual costs may vary based on factors such as location, vehicle make and model, and the shop's labor rates. It's recommended to obtain a detailed quote from a qualified mechanic to determine the precise cost of addressing this issue.

When is the Code Detected?

SHORT TO VOLTAGE: If the Occupant Restraint Controller (ORC) detects the passenger seat belt buckle switch circuits have been shorted to voltage for 2.5 seconds. The active code will change to stored after the ORC verifies the seat belt switch sense circuit voltage has returned to normal voltage range for five seconds. OPEN: If the ORC detects the passenger seat belt buckle switch circuits have been open for 2.5 seconds. The active code will change to stored after the ORC verifies the passenger seat belt buckle switch sense circuit voltage has returned to normal voltage range for five seconds.

Need more information about the B1B55 RAM code?

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Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1B55 RAM Code

1. What does the OBDII code B1B55 mean?

The code B1B55 indicates a problem with the 1st row passenger seat belt sensor circuit, specifically that it is reading a high voltage condition.

2. What are the common symptoms of the B1B55 code?

Common symptoms include the airbag warning light being illuminated, passenger seat belt reminders not functioning correctly, or intermittent chimes when the seat belt is fastened.

3. What causes the B1B55 code to appear?

This code can be caused by a faulty seat belt sensor, damaged wiring or connectors, a short or open circuit in the seat belt sensor circuit, or a malfunctioning occupant classification system (OCS).

4. Is it safe to drive with the B1B55 code active?

Driving with this code may compromise the functionality of the passenger airbag system. It is best to have it diagnosed and repaired promptly.

5. How is the B1B55 code diagnosed?

Technicians will inspect the seat belt sensor, wiring, and connectors for damage, test the circuit for high resistance, and use a scan tool to verify the fault and clear the code after repairs.

6. Can a loose seat belt connector cause the B1B55 code?

Yes, a loose or disconnected seat belt connector can trigger this code by disrupting the circuit's proper operation.

7. What repairs can fix the B1B55 code?

Repairs may include replacing the seat belt sensor, repairing or replacing damaged wiring or connectors, or re-calibrating the occupant classification system if needed.

8. How much does it cost to fix the B1B55 code?

The repair cost varies depending on the issue, but typically ranges from $100 to $300 for diagnostics and parts replacement.

9. Can I fix the B1B55 code myself?

If you are experienced with automotive electrical systems, you can check and repair wiring or connectors. Otherwise, it is recommended to consult a professional.

10. Will clearing the code with a scan tool solve the problem?

Clearing the code without addressing the underlying issue will only temporarily hide the problem, and the code is likely to reappear.

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