AutoCodes – GMC – B0074 GMC

B0074 GMC 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 GMC 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 2,585

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

What does this mean?

What are the Possible Causes of the DTC B0074 GMC?

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 GMC?

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 GMC 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 GMC code?

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

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Get the B0074 GMC 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 GMC Code

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

The common symptoms include the airbag warning light staying illuminated, inconsistent deployment of the passenger airbag, and potential passenger airbag system malfunctions.

2. What are the typical causes of OBDII code B0074 GMC for the Passenger Occupant Classification Sensor?

Common causes 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 OBDII code B0074 GMC related to the Passenger Occupant Classification Sensor?

Diagnosis involves using a scan tool to retrieve the specific trouble code, inspecting the passenger occupant classification sensor and related wiring for damage, and conducting tests to determine the root cause of the issue.

4. Can I repair OBDII code B0074 GMC for the Passenger Occupant Classification Sensor myself?

While some DIY enthusiasts may attempt simple repairs like checking and cleaning connections, troubleshooting and repairing the passenger occupant classification sensor system typically requires professional knowledge and tools due to safety and precision concerns.

5. Is it safe to drive with OBDII code B0074 GMC triggered by the Passenger Occupant Classification Sensor?

Driving with this code triggered is not recommended, as it may compromise the proper functioning of the passenger airbag system, potentially putting the safety of the vehicle occupants at risk in the event of a collision.

6. How much does it cost to repair OBDII code B0074 GMC related to the Passenger Occupant Classification Sensor?

The cost of repair can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the OBDII code B0074 GMC related to the Passenger Occupant Classification Sensor make it go away permanently?

Resetting the code without addressing the underlying issue will not make it go away permanently. The problem needs to be diagnosed and repaired to prevent the code from reoccurring.

8. Are there any recalls or technical service bulletins related to OBDII code B0074 GMC for the Passenger Occupant Classification Sensor?

It's advisable to check with GMC dealerships or online resources to see if there are any recalls or technical service bulletins related to this specific OBDII code and sensor issue.

9. How long does it typically take to repair OBDII code B0074 GMC for the Passenger Occupant Classification Sensor?

The repair time can vary depending on the exact cause of the problem and the complexity of the repair procedures involved. It may take a few hours to a full day to properly diagnose and fix the issue.

10. Can a faulty Passenger Occupant Classification Sensor impact the overall safety of the vehicle?

Yes, a faulty sensor can affect the proper deployment of the passenger airbag, potentially increasing the risk of injury to the passenger in the event of a collision. It is crucial to address this issue promptly to maintain the safety of the vehicle occupants.