AutoCodes – Hummer – B0074 Hummer

B0074 Hummer Code - Passenger Occupant Classification Sensor

Quick Answer

The Passenger Presence System (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a hose clamp to a pressure sensor. Common causes include Faulty Passenger Occupant Classification Sensor, Passenger Occupant Classification Sensor harness is open or shorted, Passenger Occupant Classification 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: B0074 Hummer indicates Passenger Occupant Classification Sensor.
Common causes: Common causes include Faulty Passenger Occupant Classification Sensor, Passenger Occupant Classification Sensor harness is open or shorted, Passenger Occupant Classification 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 2,799

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0074 Hummer Description

The Passenger Presence System (PPS) uses a silicone filled sensor pad located underneath the passenger seat foam cushion and is connected by a hose clamp to a pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor is a 3-wire sensor consisting of a power, ground, and signal circuit. The PPS continually monitors itself and if a fault in this circuit occurs, a Diagnostic Trouble Code (DTC) will set. When the Sensing and Diagnostic Module (SDM) detects this DTC within the PPS, it will notify the customer of the enable/disable status by turning ON the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then suppress the deployment of the Instrument Panel (I/P) module and then turn the AIR BAG indicator ON.

OBDII Code B0074 Hummer - Passenger Occupant Classification Sensor - AutoCodes.com — B0074 Hummer Code - Passenger Occupant Classification Sensor

What does this mean?

What are the Possible Causes of the DTC B0074 Hummer?

Faulty Passenger Occupant Classification Sensor
Passenger Occupant Classification Sensor harness is open or shorted
Passenger Occupant Classification Sensor circuit poor electrical connection
Faulty Sensing and Diagnostic Module (SDM)

How to Fix the DTC B0074 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

DTC B0074 03 Passenger Occupant Classification Sensor Circuit Voltage Below Threshold
DTC B0074 07 Passenger Occupant Classification Circuit Voltage Above Threshold
DTC B0074 08 Passenger Occupant Classification Circuit Signal Invalid

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0074 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 B0074 Hummer code?

Need more information on how to fix the B0074 Hummer code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0074 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 B0074 Hummer Code

1. What are the common symptoms of OBDII code B0074 in a Hummer related to the Passenger Occupant Classification Sensor?

The common symptoms include the airbag warning light illuminating on the dashboard and potential issues with the passenger airbag system.

2. What are the possible causes of OBDII code B0074 in a Hummer?

The code B0074 in a Hummer is typically caused by a malfunction in the Passenger Occupant Classification Sensor or its related components.

3. How can I diagnose the issue causing OBDII code B0074 in my Hummer?

Diagnosing the issue involves using a diagnostic scanner to read the fault codes, performing visual inspections of the sensor and its wiring, and potentially conducting electronic testing of the sensor.

4. Can I continue to drive my Hummer with OBDII code B0074 present?

It is not recommended to continue driving the vehicle with the code present, as it indicates a potential problem with the passenger airbag system, which could affect safety in the event of a collision.

5. What are the repair options for fixing OBDII code B0074 in a Hummer?

Repair options may include replacing the Passenger Occupant Classification Sensor, repairing or replacing damaged wiring, or reprogramming the airbag control module.

6. Are there any DIY tips for troubleshooting OBDII code B0074 in a Hummer?

While some basic inspections can be done by DIY enthusiasts, diagnosing and repairing the Passenger Occupant Classification Sensor issue may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

7. How much does it typically cost to repair OBDII code B0074 in a Hummer?

The cost of repairing OBDII code B0074 can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Is the Passenger Occupant Classification Sensor covered under warranty in a Hummer?

Depending on the age and mileage of the vehicle, the sensor may be covered under the manufacturer's warranty or extended warranty, so it's advisable to check with the dealership or warranty provider.

9. Can OBDII code B0074 be triggered by other issues unrelated to the Passenger Occupant Classification Sensor?

While the code is primarily associated with the sensor, it is possible for other issues such as wiring faults or airbag system malfunctions to trigger the B0074 diagnostic trouble code.

10. How important is it to address OBDII code B0074 in a timely manner?

It is crucial to address the issue promptly, as OBDII code B0074 relates to the passenger airbag system's functionality, which plays a vital role in occupant safety during a collision.