B2854 Implausible Data Received from AHBM 2

• OBD2 Code: B2854
• Description: Implausible data received from AHBM (Active Headrest Backrest Module) 2.
• Definition: This code indicates that the vehicle’s control module has detected a communication error or implausible data from the Active Headrest Backrest Module, which may affect the functionality of the active headrest system designed to enhance occupant safety during a collision.

B2854: Implausible Data Received From AHBM 2

Severity: Moderate

Common Causes

B2854 – Implausible Data Received From AHBM 2

• Loose or corroded electrical connections
• Faulty AHBM (Active Hydraulic Body Mount) sensor
• Interference from other electronic devices
• Wiring harness issues

 

Common Misdiagnosis

OBD2 Code: B2854

Description: Implausible Data Received from AHBM 2

Common Misdiagnosis: Faulty sensor or wiring issue is often misdiagnosed as a problem with the AHBM module itself.

 

Common Diagnostic Steps

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OBD2 Code: B2854 – Implausible Data Received from AHBM 2

Description: This code indicates that the vehicle’s control module has received data from the Active Headrest/Head Restraint Control Module (AHBM) 2 that is not plausible.

Common Diagnostic Steps:

• Verify the code with an OBD-II scanner and clear it to see if it returns.
• Inspect all related wiring and connectors for damage, corrosion, or disconnection. Pay special attention to the connections between the AHBM 2 and other modules.
• Check for any additional codes that may indicate a communication issue with other modules.
• Test the battery voltage and charging system to ensure proper power supply to all modules.
• If equipped, perform a software update on the AHBM 2 as per manufacturer recommendations.
• If no issues are found in wiring or connections, consider replacing the AHBM 2 after verifying its failure through diagnostic tests specific to your vehicle model.