AutoCodes – Buick – B323B Buick

B323B Buick Code - Lower Hands Free Sensor Signal Invalid

Quick Answer

The power liftgate has a feature that detects the motion of a foot under the rear fascia, this allows the operator to open the liftgate when his or her hands are full of packages. Common causes include Faulty Lower Hands Free Sensor, Lower Hands Free Sensor harness is open or shorted, Lower Hands Free 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: B323B Buick indicates Lower Hands Free Sensor Signal Invalid.
Common causes: Common causes include Faulty Lower Hands Free Sensor, Lower Hands Free Sensor harness is open or shorted, Lower Hands Free 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 860

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 Mar 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B323B Buick Description

The power liftgate has a feature that detects the motion of a foot under the rear fascia, this allows the operator to open the liftgate when his or her hands are full of packages. As an indicator that the action has been properly preformed, the liftgate hands-free sensor control module will send a serial data message to the liftgate control module to command the liftgate to release and power open and the liftgate control module will send a serial data message to the body control module to command the tail lights to flash 3 times. The Diagnostic Trouble Code (DTC) sets when the liftgate control module has received a serial data message that an invalid signal from the lower hands free sensor has been detected by the Hands Free Liftgate Sensor Control Module.

OBDII Code B323B Buick - Lower Hands Free Sensor Signal Invalid - AutoCodes.com — B323B Buick Code - Lower Hands Free Sensor Signal Invalid

What does this mean?

What are the Possible Causes of the DTC B323B Buick?

Faulty Lower Hands Free Sensor
Lower Hands Free Sensor harness is open or shorted
Lower Hands Free Sensor circuit poor electrical connection
Faulty Hands Free Liftgate Sensor Control Module

How to Fix the DTC B323B Buick?

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 B323B Buick 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.

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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.