AutoCodes – Buick – B0074 Buick

B0074 Buick 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 Buick 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 2,430

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

What does this mean?

What are the Possible Causes of the DTC B0074 Buick?

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 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 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 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.

Need more information about the B0074 Buick code?

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

Need Help with the Code?

Get the B0074 Buick 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 Buick Code

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

The common symptoms include the airbag warning light illuminating on the dashboard and the passenger airbag system possibly being disabled.

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

The code B0074 typically indicates a fault with the Passenger Occupant Classification System, which can be caused by a malfunctioning sensor, wiring issues, or a problem with the airbag control module.

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

Diagnosing the issue may require using a diagnostic scanner to retrieve the specific fault code, inspecting the wiring and connections related to the Passenger Occupant Classification System, and potentially testing the sensor itself.

4. Can I still drive my Buick with OBDII code B0074 present?

While it may be possible to drive the vehicle with the code present, it is strongly recommended to have the issue diagnosed and repaired as soon as possible to ensure the proper functioning of the passenger airbag system in the event of an accident.

5. Is it safe for passengers to ride in a Buick with OBDII code B0074 triggered?

It is not ideal to have passengers in the vehicle when the airbag system is potentially compromised. It is recommended to have the issue inspected and resolved promptly to ensure the safety of all occupants.

6. How much does it typically cost to repair OBDII code B0074 in a Buick?

The cost of repairing OBDII code B0074 can vary depending on the underlying cause of the issue. It is advisable to consult a qualified mechanic or dealership for an accurate assessment and cost estimate.

7. Can I reset OBDII code B0074 in my Buick without fixing the underlying problem?

While you can reset the code using a diagnostic scanner, it is not recommended to do so without addressing the root cause. The code is likely to reappear if the issue is not resolved.

8. Are there any DIY repair tips for fixing OBDII code B0074 in a Buick?

DIY repair for this code can be challenging due to the complexity of the airbag system. It is best to consult a professional technician with experience in diagnosing and repairing airbag-related issues.

9. Will OBDII code B0074 cause my Buick to fail a state inspection?

OBDII code B0074 may cause your vehicle to fail a state inspection, as it typically relates to the passenger airbag system, which is an important safety component. It is advisable to address the issue before undergoing an inspection.

10. How long does it take to repair OBDII code B0074 in a Buick?

The repair time for OBDII code B0074 can vary depending on the specific cause of the issue and the availability of parts. It is best to consult a professional technician for a more accurate estimate of the repair timeline.