AutoCodes – Generic – B3896

B3896 Code - Deck Lid Ajar Siwtch Signal Circuit Open Or High

Quick Answer

Rear compartment occupant sensor is connected to battery voltage and ground at all times. Common causes include Faulty Deck Lid Ajar Siwtch, Deck Lid Ajar Siwtch harness is open or shorted, Deck Lid Ajar Siwtch 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: B3896 indicates Deck Lid Ajar Siwtch Signal Circuit Open Or High.
Common causes: Common causes include Faulty Deck Lid Ajar Siwtch, Deck Lid Ajar Siwtch harness is open or shorted, Deck Lid Ajar Siwtch 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 1,346

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 Mar 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3896 Description

Rear compartment occupant sensor is connected to battery voltage and ground at all times. When a combination of a difference in temperature compared to ambient and movement is detected by rear compartment occupant sensor and ignition is off, Body Control Module (BCM) will command horn to chirp and command deck lid to release within 3 minutes of a detect signal from rear compartment occupant sensor. If ignition is on when BCM receives detect signal, disable switch on rear compartment occupant sensor will flash.
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 detects an open, short to voltage in trunk ajar switch signal circuit for greater than 2 seconds.

OBDII Code B3896 - Deck Lid Ajar Siwtch Signal Circuit Open Or High - AutoCodes.com — B3896 Code - Deck Lid Ajar Siwtch Signal Circuit Open Or High

What does this mean?

What are the Possible Causes of the DTC B3896?

Faulty Deck Lid Ajar Siwtch
Deck Lid Ajar Siwtch harness is open or shorted
Deck Lid Ajar Siwtch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B3896?

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 B3896 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 B3896 code?

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Need Help with the Code?

Get the B3896 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B3896 Buick — Deck Lid Ajar Siwtch Signal Circuit Open Or High
B3896 Cadillac — Deck Lid Ajar Siwtch Signal Circuit Open Or High
B3896 Chevrolet — Deck Lid Ajar Siwtch Signal Circuit Open Or High
B3896 GMC — Deck Lid Ajar Siwtch Signal Circuit Open Or High

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 B3896 Code

1. What does the OBDII code B3896 mean?

Code B3896 refers to an issue with the Deck Lid Ajar Switch Signal Circuit, indicating it is open or showing a high voltage condition.

2. What are the symptoms of code B3896?

Common symptoms include the trunk or deck lid ajar warning light staying on, interior lights remaining illuminated, or the inability to lock the trunk properly.

3. What causes the B3896 code to appear?

This code can be caused by a faulty deck lid ajar switch, damaged or corroded wiring, a loose connector, or a malfunctioning body control module (BCM).

4. How can I diagnose the B3896 code?

Check the deck lid ajar switch for proper operation, inspect the wiring and connectors for damage or corrosion, and use a multimeter to test for proper voltage in the circuit.

5. Can I drive my car with a B3896 code?

Yes, you can still drive the car, but the trunk may not secure properly, and interior lights could drain the battery if they remain on.

6. How do I fix the B3896 code?

Repairs may involve replacing the deck lid ajar switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the body control module if necessary.

7. How much does it cost to repair the B3896 code?

Repair costs vary but typically range from $50 to $200, depending on whether the issue is with the switch, wiring, or BCM.

8. Can a bad deck lid ajar switch damage my car?

A bad switch itself wonâ€™t directly damage the car, but it can lead to battery drain if interior lights remain on or compromise trunk security.

9. How can I prevent the B3896 code from recurring?

Regularly inspect and clean the trunk switch and connectors, avoid slamming the trunk, and address any electrical issues promptly.

10. Does the B3896 code require professional repair?

While some issues, like cleaning or replacing the switch, can be done by a DIYer, more complex electrical problems may require professional diagnosis and repair.