AutoCodes – Generic – B2856

B2856 Code - Crash Zone Sensor System Communication Data Error

Quick Answer

The SAS Control Module detects an error of impact magnitude set in the sensor, which occurs due to the installation mismatch of the crash zone sensor or side air bag sensors. Common causes include Crash zone sensor improperly installed with wrong sensor, Driver-side side air bag sensor improperly installed with wrong sensor, Passenger-side side air bag sensor improperly installed with wrong sensor. 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: B2856 indicates Crash Zone Sensor System Communication Data Error.
Common causes: Common causes include Crash zone sensor improperly installed with wrong sensor, Driver-side side air bag sensor improperly installed with wrong sensor, Passenger-side side air bag sensor improperly installed with wrong sensor.
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 883

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 B2856 Description

The SAS Control Module detects an error of impact magnitude set in the sensor, which occurs due to the installation mismatch of the crash zone sensor or side air bag sensors.

OBDII Code B2856 - Crash Zone Sensor System Communication Data Error - AutoCodes.com — B2856 Code - Crash Zone Sensor System Communication Data Error

What does this mean?

What are the Possible Causes of the DTC B2856?

Crash zone sensor improperly installed with wrong sensor
Driver-side side air bag sensor improperly installed with wrong sensor
Passenger-side side air bag sensor improperly installed with wrong sensor
Faulty SAS Control Module

How to Fix the DTC B2856?

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 B2856 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 B2856 code?

Need more information on how to fix the B2856 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2856 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2856 Ford — Crash Zone Sensor System Communication Data Error
B2856 Lincoln — Crash Zone Sensor System Communication Data Error
B2856 Mazda — Crash Zone Sensor System Communication Data Error
B2856 Mercury — Crash Zone Sensor System Communication Data Error

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 B2856 Code

1. What are the common symptoms of OBDII code B2856 (Crash Zone Sensor System Communication Data Error)?

- Common symptoms include the airbag warning light staying illuminated on the dashboard and potential issues with the vehicle's airbag system.

2. What are the possible causes of OBDII code B2856?

- The code B2856 can be triggered by damaged wiring or connectors in the crash zone sensor system, faulty crash zone sensor modules, or communication errors within the system.

3. How can I diagnose the OBDII code B2856?

- Diagnosis involves using a professional OBDII scanner to retrieve the specific fault code. Further inspection of the crash zone sensor system components may be necessary to identify the root cause.

4. Is it safe to drive with OBDII code B2856 present?

- It is not recommended to drive with the OBDII code B2856 as it indicates a potential issue with the airbag system, which may compromise its functionality in the event of a collision.

5. Can I reset the OBDII code B2856 myself?

- While you can clear the fault code using an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from reoccurring.

6. How can I repair OBDII code B2856?

- Repairing code B2856 may involve inspecting and repairing damaged wiring or connectors, replacing faulty crash zone sensor modules, or addressing any communication errors within the system.

7. Will OBDII code B2856 cause the airbags to deploy unexpectedly?

- OBDII code B2856 itself will not cause the airbags to deploy unexpectedly. However, it signifies a potential issue with the airbag system that should be addressed promptly to ensure proper functionality.

8. Can a DIY enthusiast fix OBDII code B2856 at home?

- Depending on your skill level and access to tools, some components related to OBDII code B2856 may be replaced or repaired at home. However, for more complex issues, it is recommended to seek professional help.

9. How much does it typically cost to repair OBDII code B2856?

- Repair costs for OBDII code B2856 can vary depending on the underlying cause and the extent of the repairs needed. It is advisable to consult a mechanic for an accurate diagnosis and cost estimate.

10. Can OBDII code B2856 be a recurring issue?

- OBDII code B2856 can be a recurring issue if the root cause is not properly addressed during repairs. Thorough diagnostics and repairs are necessary to prevent the code from reappearing.