AutoCodes – Hummer – B0071 Hummer

B0071 Hummer Code - Passenger Seat Belt Tension Sensor Circuit

Quick Answer

The seat belt tension sensor is a sensor mounted on the passenger seat belt retractor and provides input to the Passenger Presence Module. Common causes include Faulty Passenger Seat Belt Retractor (Passenger Seat Belt Tension Sensor), Passenger Seat Belt Retractor harness is open or shorted, Passenger Seat Belt Retractor 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: B0071 Hummer indicates Passenger Seat Belt Tension Sensor Circuit.
Common causes: Common causes include Faulty Passenger Seat Belt Retractor (Passenger Seat Belt Tension Sensor), Passenger Seat Belt Retractor harness is open or shorted, Passenger Seat Belt Retractor 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 3,183

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 Oct 17, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0071 Hummer Description

The seat belt tension sensor is a sensor mounted on the passenger seat belt retractor and provides input to the Passenger Presence Module. When an infant car seat is properly restrained on the front passenger seat, the seat belt is tightly secured through the car seat. The seat belt pulls on the tension sensor and changes the voltage signal to the Passenger Presence Module. The Passenger Presence Module monitors the belt tension sensor signal circuit and if a fault is detected, the Diagnostic Trouble Code (DTC) will be set. When the Passenger Presence Module detects this DTC, it will send out a serial data message, and the Inflatable Restraint Sensing and Diagnostic Module will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. The Inflatable Restraint Sensing and Diagnostic Module (SDM) will then suppress the deployment of the passenger instrument panel air bag and illuminate the AIR BAG indicator.

OBDII Code B0071 Hummer - Passenger Seat Belt Tension Sensor Circuit - AutoCodes.com — B0071 Hummer Code - Passenger Seat Belt Tension Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC B0071 Hummer?

Faulty Passenger Seat Belt Retractor (Passenger Seat Belt Tension Sensor)
Passenger Seat Belt Retractor harness is open or shorted
Passenger Seat Belt Retractor circuit poor electrical connection
Faulty Passenger Presence Module

How to Fix the DTC B0071 Hummer?

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 does this mean?

Code Tech Notes

B0071:03 Passenger Seat Belt Tension Sensor Circuit Voltage Below Threshold
B0071:04 Passenger Seat Belt Tension Sensor Circuit Open
B0071:07 Passenger Seat Belt Tension Sensor Circuit Voltage Above Threshold
B0071:08 Passenger Seat Belt Tension Sensor Circuit Voltage Performance Signal Invalid

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0071 Hummer 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 B0071 Hummer code?

Need more information on how to fix the B0071 Hummer code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0071 Hummer 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 B0071 Hummer Code

1. What are the common symptoms of OBDII code B0071 in a Hummer related to the passenger seat belt tension sensor circuit?

The common symptoms include the airbag light or SRS light illuminating on the dashboard, warning chimes, and potential disabling of the passenger airbag.

2. What could be the possible causes of OBDII code B0071 in a Hummer?

Possible causes include a faulty passenger seat belt tension sensor, damaged wiring or connectors in the circuit, or a malfunctioning airbag control module.

3. How can I diagnose the issue with the passenger seat belt tension sensor circuit triggering OBDII code B0071 in my Hummer?

Diagnosis involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors for any visible damage, and testing the seat belt tension sensor for proper functionality.

4. Can I continue driving my Hummer with OBDII code B0071 related to the passenger seat belt tension sensor circuit?

It is not recommended to drive the vehicle with this code present, as it may indicate a potential safety issue with the passenger airbag system.

5. How can I repair OBDII code B0071 in my Hummer caused by the passenger seat belt tension sensor circuit issue?

Repair options may include replacing the faulty seat belt tension sensor, repairing or replacing damaged wiring or connectors, or resetting the airbag control module after addressing the root cause.

6. Are there any DIY tips for troubleshooting OBDII code B0071 in a Hummer without specialized tools?

While basic visual inspections of wiring and connectors can be done, diagnosing and repairing this code may require specialized tools and expertise due to the safety-critical nature of the airbag system.

7. How much does it typically cost to repair OBDII code B0071 related to the passenger seat belt tension sensor circuit in a Hummer?

Repair costs can vary depending on the exact cause of the issue, but expect expenses for parts and labor to address the faulty sensor or wiring, potentially ranging from $200 to $600 or more.

8. Can resetting the OBDII code B0071 related to the passenger seat belt tension sensor circuit in my Hummer fix the issue permanently?

Simply resetting the code may not fix the underlying problem causing the code to appear. It is crucial to diagnose and address the root cause of the issue to ensure a permanent fix.

9. Is it safe to attempt to repair the passenger seat belt tension sensor circuit issue triggering OBDII code B0071 in my Hummer without professional help?

Due to the safety implications of the airbag system, it is advisable to seek professional assistance or consult the vehicle's service manual for proper repair procedures to ensure the system functions correctly.

10. How often does the passenger seat belt tension sensor circuit issue triggering OBDII code B0071 occur in Hummer vehicles?

While not extremely common, issues with the passenger seat belt tension sensor circuit can occur in Hummer vehicles, especially in older models or those exposed to harsh driving conditions. Regular maintenance and inspections can help prevent such issues.