AutoCodes – Mercury – B2855 Mercury

B2855 Mercury Code - Crash Zone Sensor Circuit Short

Quick Answer

The Air Bag Control Module monitors the Front Crash Sensor. Common causes include Faulty Front Crash Sensor, Front Crash Sensor harness is open or shorted, Front Crash Sensor circuit poor electrical connection. 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 Faulty Front Crash Sensor, Front Crash Sensor harness is open or shorted, Front Crash Sensor circuit poor electrical connection.
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.

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Code Popularity 534

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 17, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2855 Mercury Description

The Air Bag Control Module monitors the Front Crash Sensor. The Air Bag Control Module sets the OBDII code when the Front Crash Sensor is not to factory specifications.

OBDII Code B2855 Mercury - Crash Zone Sensor Circuit Short - AutoCodes.com — B2855 Mercury Code - Crash Zone Sensor Circuit Short

What does this mean?

What are the Possible Causes of the DTC B2855 Mercury?

Faulty Front Crash Sensor
Front Crash Sensor harness is open or shorted
Front Crash Sensor circuit poor electrical connection
Faulty Air Bag Control Module

How to Fix the DTC B2855 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2855 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B2855 Mercury code?

Need more information on how to fix the B2855 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2855 Mercury code diagnosed by a professional: Find a repair shop in your area

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.