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Engine-Codes – Mercury – B2855 Mercury

B2855 Mercury Code - Crash Zone Sensor Circuit Short

Quick Answer

The B2855 code indicates a fault in the crash zone sensor circuit within Mercury vehicles. Common causes include Short circuit in the wiring harness connected to the crash zone sensor, Corrosion or damage at the connector points of the sensor, A faulty crash zone sensor that fails to operate correctly. 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
B2855 Mercury indicates Crash Zone Sensor Circuit Short.
Common causes
Common causes include Short circuit in the wiring harness connected to the crash zone sensor, Corrosion or damage at the connector points of the sensor, A faulty crash zone sensor that fails to operate correctly.
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 Oct 24, 2024
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Code B2855 Mercury Description

The B2855 code indicates a fault in the crash zone sensor circuit within Mercury vehicles. This sensor plays a critical role in the vehicle's airbag system, as it is responsible for detecting the severity of a collision and determining the appropriate response from the airbag deployment system. When the circuit experiences a short, it can lead to a failure in the sensor's ability to communicate effectively with the vehicle's onboard computer, resulting in the airbag system being disabled or malfunctioning.

OBDII Code B2855 Mercury - Crash Zone Sensor Circuit Short
B2855 Mercury Code - Crash Zone Sensor Circuit Short

Common Causes of B2855 Mercury

  1. Short circuit in the wiring harness connected to the crash zone sensor.
  2. Corrosion or damage at the connector points of the sensor.
  3. A faulty crash zone sensor that fails to operate correctly.
  4. Physical impact or collision that has affected the sensor's position or integrity.
  5. Electrical interference from other components within the vehicle's electrical system.

Symptoms of B2855 Mercury

  1. Airbag warning light illuminated on the dashboard.
  2. Inconsistent or non-deployment of airbags during simulated crash tests.
  3. Diagnostic trouble code (DTC) stored in the vehicle's computer system.
  4. Malfunctioning or erratic behavior of other safety systems, such as traction control or stability control.
  5. Physical damage or visible wear on the crash zone sensor or its wiring harness.

How to Fix B2855 Mercury

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the B2855 code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a thorough visual inspection of the crash zone sensor, wiring, and connectors for signs of damage, corrosion, or loose connections.
  3. Repair or Replace Wiring: If a short circuit is identified, repair any damaged wiring or replace the entire wiring harness if necessary to ensure proper connectivity.
  4. Sensor Replacement: If the crash zone sensor is found to be faulty, replace it with a new, OEM-quality sensor to restore functionality.
  5. Clear Codes and Test: After repairs, clear the diagnostic codes and conduct a test drive to ensure that the airbag system is functioning correctly and that the warning light does not reappear.

Cost to Fix B2855 Mercury

The typical repair costs for addressing the B2855 code can vary widely based on the specific issue identified, the make and model of the vehicle, and the labor rates in your area. On average, repairs can range from $150 to $600, which includes parts and labor. The cost of a new crash zone sensor can be approximately $100 to $300, while labor costs may range from $80 to $150 per hour. It's important to note that labor rates can differ significantly based on location, with metropolitan areas and dealerships often charging higher rates than independent shops. Therefore, it is advisable to check local repair shops for more precise estimates and to ensure that the diagnosis is thorough before proceeding with repairs.

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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 B2855 Mercury Code

1. What does the OBDII code B2855 mean for a Mercury vehicle?

The code B2855 indicates a fault in the Crash Zone Sensor Circuit, specifically a short to ground, power, or another circuit.

2. What are the common symptoms of the B2855 code in a Mercury?

Symptoms include an illuminated airbag warning light, possible deactivation of the airbag system, and stored fault codes in the vehicle's control module.

3. What causes the B2855 code to appear?

The common causes include damaged or corroded wiring, a faulty crash zone sensor, poor electrical connections, or a malfunction in the airbag control module.

4. Can I drive my Mercury with the B2855 code active?

It is not recommended to drive with this code active, as it may indicate that the airbag system is disabled, compromising safety in the event of an accident.

5. How do you diagnose the B2855 code in a Mercury?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the crash zone sensor and associated wiring, and testing the circuit for continuity or shorts.

6. How do you fix the B2855 code in a Mercury?

Repairs may include replacing the crash zone sensor, repairing or replacing damaged wiring, or cleaning and securing electrical connections.

7. How much does it cost to fix the B2855 code in a Mercury?

Repair costs can range from $150 to $400, depending on whether the issue lies in the sensor, wiring, or control module.

8. Is the crash zone sensor the same as the airbag sensor?

The crash zone sensor is a type of airbag sensor located in the front of the vehicle, typically used to detect frontal impacts.

9. Will clearing the B2855 code fix the issue?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to reappear.

10. What tools are needed to troubleshoot the B2855 code?

You will need an OBDII scanner, a multimeter for testing electrical circuits, and possibly a service manual for wiring diagrams specific to your Mercury model.

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