B3898 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 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 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?
- 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?
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 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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Information for Specific Makes
- B3898 Buick — Rear Compartment Occupant Sensor Signal Missing
- B3898 Cadillac — Rear Compartment Occupant Sensor Signal Missing
- B3898 Chevrolet — Rear Compartment Occupant Sensor Signal Missing
- B3898 GMC — Rear Compartment Occupant Sensor Signal Missing
Frequently Asked Questions about B3898 Code
1. What are common symptoms of OBDII code B3898, Rear Compartment Occupant Sensor Signal Missing?
- Common symptoms include the airbag warning light on the dashboard illuminating, potential loss of communication with the rear compartment occupant sensor, and possible issues with the airbag system.
2. What does the OBDII code B3898 indicate?
- OBDII code B3898 indicates a fault in the rear compartment occupant sensor system, specifically a missing signal from the sensor.
3. What are possible causes of OBDII code B3898?
- Possible causes of code B3898 include a faulty rear compartment occupant sensor, damaged wiring or connectors in the sensor circuit, or issues with the airbag control module.
4. How can I diagnose the issue related to code B3898?
- Diagnosing the issue involves using an OBDII scanner to read the code and further investigation using a multimeter to check the sensor signal, wiring, and connections for any faults.
5. Can I still drive my vehicle with OBDII code B3898?
- It is not recommended to drive the vehicle with an active airbag fault code like B3898, as it may affect the proper functioning of the airbag system in the event of a collision.
6. How can I repair OBDII code B3898, Rear Compartment Occupant Sensor Signal Missing?
- Repairing the issue involves inspecting and repairing any damaged wiring, connectors, or replacing the faulty rear compartment occupant sensor as necessary.
7. Is it safe to reset the OBDII code B3898 without fixing the underlying issue?
- It is not advisable to reset the code without addressing the underlying issue, as it may lead to safety concerns related to the proper functioning of the airbag system.
8. Can a DIY enthusiast fix OBDII code B3898 at home?
- Depending on the level of expertise and access to tools, a DIY enthusiast may be able to diagnose and repair OBDII code B3898 related to the rear compartment occupant sensor signal missing.
9. How much does it cost to repair OBDII code B3898 through a professional service?
- The cost of repairing OBDII code B3898 can vary depending on the specific issue, parts needed, and labor rates, but it may range from a few hundred to over a thousand dollars at a professional service center.
10. What are the implications of ignoring OBDII code B3898 for an extended period?
- Ignoring OBDII code B3898 can lead to potential safety risks in the event of a collision, as the airbag system may not deploy correctly due to the missing signal from the rear compartment occupant sensor.
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