AutoCodes – Chevrolet – B0074 Chevrolet

B0074 Chevrolet 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 Chevrolet 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 18,828

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 Dec 02, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code B0074 Chevrolet 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 Chevrolet - Passenger Occupant Classification Sensor - AutoCodes.com — B0074 Chevrolet Code - Passenger Occupant Classification Sensor

What does this mean?

What are the Possible Causes of the DTC B0074 Chevrolet?

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 Chevrolet?

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

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0074 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the B0074 Chevrolet 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 Chevrolet Code

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

The common symptoms include the airbag warning light staying illuminated, the passenger airbag not deploying in a crash, and potential issues with the seat belt reminder system.

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

The code B0074 typically indicates a fault with the Passenger Occupant Classification Sensor (OCS), which could be caused by sensor failure, wiring issues, or a faulty airbag control module.

3. How can I diagnose the Passenger Occupant Classification Sensor issue causing OBDII code B0074 in my Chevrolet?

Diagnosing the issue involves using a diagnostic scan tool to retrieve the specific trouble code, inspecting the sensor and its wiring for damage, and performing testing procedures outlined in the service manual.

4. Can I repair the Passenger Occupant Classification Sensor issue causing OBDII code B0074 in my Chevrolet myself?

While some DIY enthusiasts may attempt to replace the sensor or repair wiring issues, it is recommended to have a qualified technician diagnose and repair the problem to ensure proper functionality and safety.

5. Is it safe to drive my Chevrolet with OBDII code B0074 related to the Passenger Occupant Classification Sensor?

Driving with the airbag warning light on due to code B0074 poses a potential safety risk as the passenger airbag may not deploy in a crash. It is advisable to have the issue addressed promptly.

6. How much does it typically cost to repair OBDII code B0074 in a Chevrolet caused by a faulty Passenger Occupant Classification Sensor?

The cost of repair can vary depending on the specific issue and labor rates in your area. Replacing the sensor or addressing wiring problems may range from $200 to $500 or more.

7. Are there any recalls or service bulletins related to OBDII code B0074 in Chevrolet vehicles?

Chevrolet may have issued recalls or service bulletins related to the Passenger Occupant Classification Sensor issue causing code B0074. Check with a Chevrolet dealership or online resources for any relevant information.

8. Can a faulty Passenger Occupant Classification Sensor causing OBDII code B0074 be reset without repairs?

Resetting the code without addressing the underlying issue will not resolve the problem. The sensor issue must be diagnosed and repaired to clear the code and ensure proper airbag system functionality.

9. How long does it take to repair the Passenger Occupant Classification Sensor problem causing OBDII code B0074 in a Chevrolet?

The repair time can vary based on the exact issue and technician's experience. Replacing the sensor or repairing wiring may take a few hours to a full day in some cases.

10. Will fixing OBDII code B0074 related to the Passenger Occupant Classification Sensor affect my Chevrolet's airbag system performance?

Addressing the code B0074 issue by repairing the Passenger Occupant Classification Sensor is crucial for ensuring the proper operation of the airbag system, especially in the event of a crash.