B3898 GMC Code - Rear Compartment Occupant Sensor Signal Missing
Quick Answer
Rear compartment occupant sensor is connected to battery voltage and ground at all times. Common causes include Faulty Rear Compartment Occupant Sensor, Rear Compartment Occupant Sensor harness is open or shorted, Rear Compartment Occupant 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
- B3898 GMC indicates Rear Compartment Occupant Sensor Signal Missing.
- Common causes
- Common causes include Faulty Rear Compartment Occupant Sensor, Rear Compartment Occupant Sensor harness is open or shorted, Rear Compartment Occupant 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.
Code B3898 GMC Description
Rear compartment occupant sensor can be disabled by pressing disable switch on rear compartment occupant sensor and holding for 2 seconds. BCM will command trunk ajar telltale on for one minute with each ignition on signal while rear compartment occupant sensor is disabled. Once deck lid is opened, rear compartment occupant sensor will reset to on and resume normal operation. Rear compartment occupant sensor can also be enabled inside of rear compartment with ignition on or off by pressing disable switch. Deck lid ajar switch signal circuit is used for rear compartment occupant sensor class 2 data.
The Diagnostic Trouble Code (DTC) sets when BCM does not receive a motion status after a set number of trunk openings.
What are the Possible Causes of the DTC B3898 GMC?
- Faulty Rear Compartment Occupant Sensor
- Rear Compartment Occupant Sensor harness is open or shorted
- Rear Compartment Occupant Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3898 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3898 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.
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Frequently Asked Questions about B3898 GMC Code
1. What are the common symptoms of OBDII code B3898 GMC (Rear Compartment Occupant Sensor Signal Missing)?
- Common symptoms include the airbag warning light coming on, potential loss of airbag functionality, and a diagnostic trouble code indicating a missing signal from the rear compartment occupant sensor.
2. What could cause the OBDII code B3898 GMC to trigger?
- Possible causes for this code include a faulty rear compartment occupant sensor, a wiring issue in the sensor circuit, or a problem with the airbag control module.
3. How can I diagnose the issue related to code B3898 GMC?
- Diagnosing the issue involves inspecting the rear compartment occupant sensor and its wiring for any damage, testing the sensor's signal output, and using a scan tool to retrieve and interpret the trouble codes.
4. Can I still drive my vehicle with the B3898 GMC code present?
- It is not recommended to drive the vehicle with the B3898 GMC code active, as it indicates a potential issue with the airbag system, which could compromise passenger safety in the event of a collision.
5. How can I repair the B3898 GMC code related to the Rear Compartment Occupant Sensor Signal Missing?
- Repairing this code typically involves replacing the faulty rear compartment occupant sensor, repairing any damaged wiring in the sensor circuit, or addressing any issues with the airbag control module.
6. Is it safe to reset the OBDII code B3898 GMC without fixing the underlying issue?
- It is not advised to simply reset the code without addressing the root cause, as it could lead to ongoing safety risks related to the airbag system's functionality.
7. Are there any safety precautions to consider when working on the airbag system related to this code?
- When working on the airbag system, it is crucial to disconnect the vehicle's battery, wait for the system to discharge, and follow proper safety procedures to avoid accidental airbag deployment.
8. Can a DIY enthusiast fix the B3898 GMC code issue, or is professional help recommended?
- While some experienced DIY enthusiasts may be able to diagnose and repair the issue themselves, dealing with the airbag system can be complex and potentially dangerous, so professional help is often recommended.
9. How long does it typically take to repair the B3898 GMC code issue?
- The repair time can vary depending on the exact cause of the code and the complexity of the repair needed. It is advisable to consult a professional technician for a more accurate estimate.
10. Are there any recalls or technical service bulletins related to the B3898 GMC code for specific GMC models?
- It is recommended to check with GMC dealerships or online resources for any recalls or technical service bulletins related to the B3898 code for your specific vehicle model to ensure all relevant information is considered during diagnosis and repair.
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