AutoCodes – Generic – B323A

B323A Code - Upper 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 Upper Hands Free Sensor, Upper Hands Free Sensor harness is open or shorted, Upper 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: B323A indicates Upper Hands Free Sensor Signal Invalid.
Common causes: Common causes include Faulty Upper Hands Free Sensor, Upper Hands Free Sensor harness is open or shorted, Upper 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 4,088

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
FAQs
Comments
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Code B323A 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 upper hands free sensor has been detected by the Hands Free Liftgate Sensor Control Module.

OBDII Code B323A - Upper Hands Free Sensor Signal Invalid - AutoCodes.com — B323A Code - Upper Hands Free Sensor Signal Invalid

What does this mean?

What are the Possible Causes of the DTC B323A?

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

How to Fix the DTC B323A?

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 B323A 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 B323A code?

Need more information on how to fix the B323A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B323A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B323A Buick — Upper Hands Free Sensor Signal Invalid
B323A Cadillac — Upper Hands Free Sensor Signal Invalid
B323A Chevrolet — Upper Hands Free Sensor Signal Invalid
B323A GMC — Upper Hands Free Sensor Signal Invalid

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 B323A Code

1. What are the common symptoms of OBDII code B323A (Upper Hands Free Sensor Signal Invalid)?

- Common symptoms include issues with the hands-free system, such as difficulty using voice commands or activating hands-free features.

2. What could cause OBDII code B323A to trigger?

- This code may be triggered by a malfunction in the upper hands-free sensor, such as a damaged sensor or wiring issue.

3. How serious is OBDII code B323A (Upper Hands Free Sensor Signal Invalid)?

- While the code itself may not affect the drivability of the vehicle, it can impact the convenience and functionality of the hands-free system.

4. Can OBDII code B323A be cleared and reset without fixing the issue?

- Clearing the code may temporarily resolve the warning light, but the underlying issue with the upper hands-free sensor should be diagnosed and repaired to prevent future problems.

5. How can I diagnose the cause of OBDII code B323A?

- Diagnostic tools can be used to pinpoint the specific issue with the upper hands-free sensor, such as testing the sensor's signal output and checking for wiring faults.

6. Is it possible to repair OBDII code B323A (Upper Hands Free Sensor Signal Invalid) at home?

- Depending on your level of automotive expertise, you may be able to repair this code at home by replacing the faulty upper hands-free sensor or addressing wiring issues.

7. Will driving with OBDII code B323A pose any risks to the vehicle?

- Driving with this code should not pose immediate risks to the vehicle's safety or performance, but it's advisable to address the issue to restore full functionality.

8. Are there any temporary fixes for OBDII code B323A until I can repair it?

- Temporary fixes may include disconnecting and reconnecting the battery to reset the system, but these should only be considered as short-term solutions.

9. How much does it typically cost to repair OBDII code B323A?

- The cost of repairing this code can vary depending on the extent of the issue, but it may involve replacing the upper hands-free sensor or addressing wiring problems.

10. Can OBDII code B323A affect other systems in the vehicle?

- While this code specifically relates to the upper hands-free sensor, it's important to address it promptly to prevent potential impacts on other vehicle systems that rely on accurate sensor signals.