AutoCodes – Generic – B0074

B0074 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 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 2,689

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

What does this mean?

What are the Possible Causes of the DTC B0074?

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?

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 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 code?

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

Need Help with the Code?

Get the B0074 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B0074 Buick — Passenger Occupant Classification Sensor
B0074 Cadillac — Passenger Occupant Classification Sensor
B0074 Chevrolet — Passenger Occupant Classification Sensor
B0074 GMC — Passenger Occupant Classification Sensor
B0074 Hummer — Passenger Occupant Classification Sensor
B0074 Pontiac — Passenger Occupant Classification Sensor
B0074 Saturn — Passenger Occupant Classification Sensor

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 Code

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

When OBDII code B0074 is triggered, you may experience issues with the passenger airbag system, including the airbag not deploying in the event of a crash or the airbag light illuminating on the dashboard.

2. What are some possible causes of OBDII code B0074?

Common causes of OBDII code B0074 include a faulty passenger occupant classification sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning airbag control module.

3. How can I diagnose the source of OBDII code B0074?

Diagnosing OBDII code B0074 typically involves using a scan tool to read the code and perform further testing on the passenger occupant classification sensor, wiring, connectors, and airbag control module to identify the root cause of the issue.

4. Can I continue driving my vehicle with OBDII code B0074?

It is not recommended to drive your vehicle with OBDII code B0074 present, as it indicates a potential safety issue with the passenger airbag system. It is important to address this code promptly to ensure the proper functioning of the airbags.

5. How can I repair OBDII code B0074 related to the Passenger Occupant Classification Sensor?

Repairing OBDII code B0074 may involve replacing the faulty passenger occupant classification sensor, repairing or replacing damaged wiring or connectors, or reprogramming the airbag control module. It is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair.

6. Are there any safety concerns associated with OBDII code B0074?

Yes, OBDII code B0074 indicates a potential safety risk as it affects the passenger airbag system. If this system is not functioning correctly, the passenger airbag may not deploy in an accident, increasing the risk of injury to the passenger.

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

The cost of repairing OBDII code B0074 can vary depending on the root cause of the issue, the extent of the repairs needed, and the labor rates in your area. It is advisable to get a few quotes from different mechanics to compare prices.

8. Can OBDII code B0074 be reset without fixing the underlying issue?

While you can clear the code temporarily using a scan tool, the underlying issue causing OBDII code B0074 will persist. It is crucial to address the root cause of the code to ensure the proper functioning of the passenger airbag system.

9. How long does it typically take to repair OBDII code B0074?

The repair time for OBDII code B0074 can vary depending on the specific cause of the issue and the complexity of the repair. Some cases may be resolved quickly, while others may require more extensive diagnosis and repair work.

10. Can I prevent OBDII code B0074 from occurring in the future?

Regular maintenance and inspection of the passenger occupant classification sensor, wiring, and connectors can help prevent OBDII code B0074 from occurring. It is also essential to address any airbag system issues promptly to avoid potential safety risks.