AutoCodes – Generic – B396C

B396C Code - Liftgate Mode Switch Circuit Performance Signal Invalid

Quick Answer

The interior liftgate rotary control switch contains 3 resistors which are in series for the liftgate mode, depending upon which position is selected will determine which combination of resistors are used. Common causes include Faulty Liftgate Control Switch-Interior, Liftgate Control Switch-Interior harness is open or shorted, Liftgate Control Switch-Interior 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: B396C indicates Liftgate Mode Switch Circuit Performance Signal Invalid.
Common causes: Common causes include Faulty Liftgate Control Switch-Interior, Liftgate Control Switch-Interior harness is open or shorted, Liftgate Control Switch-Interior 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 1,867

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 B396C Description

The interior liftgate rotary control switch contains 3 resistors which are in series for the liftgate mode, depending upon which position is selected will determine which combination of resistors are used. The liftgate module monitors the voltage level in the liftgate mode signal circuit, as each mode is selected, the voltage within the signal circuit incrementally drops. It is this method the liftgate module will determine if mode switch is in the manual mode, garage mode or the maximum open mode.
The interior liftgate control switch has of a push button switch to command the liftgate to open and close. The liftgate module monitors the voltage level on the open/close signal circuit, when the switch is not being pressed the voltage level is at the system voltage. When the switch is pressed a contact within the interior liftgate control switch closes providing a ground path for the signal circuit causing the voltage level to drop to near zero volts. The liftgate module will detect the voltage drop and will then command the liftgate to open or close depending upon the current state of the liftgate at the time the switch is pressed.
The Diagnostic Trouble Code (DTC) sets when the liftgate control module detects an out of range condition in the mode switch signal circuit.

OBDII Code B396C - Liftgate Mode Switch Circuit Performance Signal Invalid - AutoCodes.com — B396C Code - Liftgate Mode Switch Circuit Performance Signal Invalid

What does this mean?

What are the Possible Causes of the DTC B396C?

Faulty Liftgate Control Switch-Interior
Liftgate Control Switch-Interior harness is open or shorted
Liftgate Control Switch-Interior circuit poor electrical connection
Faulty Liftgate Control Module

How to Fix the DTC B396C?

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 B396C 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

B396C Buick — Liftgate Mode Switch Circuit Performance Signal Invalid
B396C Cadillac — Liftgate Mode Switch Circuit Performance Signal Invalid
B396C Chevrolet — Liftgate Mode Switch Circuit Performance Signal Invalid
B396C GMC — Liftgate Mode Switch Circuit Performance Signal Invalid

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 B396C Code

1. What are common symptoms of OBDII code B396C (Liftgate Mode Switch Circuit Performance Signal Invalid)?

The common symptoms of code B396C include malfunctioning liftgate operation, erratic behavior of the liftgate mode switch, and illumination of the check engine light.

2. What could cause OBDII code B396C to trigger?

Code B396C might be triggered due to a faulty liftgate mode switch, damaged wiring or connectors in the liftgate circuit, or a malfunction in the liftgate control module.

3. How can I diagnose the cause of OBDII code B396C?

To diagnose the cause of code B396C, you can perform a visual inspection of the liftgate mode switch, check the wiring and connectors for any damage, and use a diagnostic scanner to retrieve additional fault codes and data related to the liftgate system.

4. What are some repair tips for resolving OBDII code B396C?

Repair tips for resolving code B396C may include replacing the liftgate mode switch if faulty, repairing or replacing damaged wiring or connectors, and resetting the liftgate control module after making necessary repairs.

5. Can OBDII code B396C be cleared/reset without fixing the underlying issue?

Clearing or resetting code B396C without fixing the underlying issue may temporarily turn off the check engine light, but the code is likely to reappear if the root cause, such as a faulty liftgate mode switch, is not addressed.

6. Is it safe to continue driving with OBDII code B396C active?

It is generally not recommended to continue driving with OBDII code B396C active, as it can lead to further damage to the liftgate system and potentially compromise the safety and functionality of the vehicle.

7. How much does it typically cost to repair OBDII code B396C?

The cost of repairing OBDII code B396C can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to consult a professional mechanic for an accurate estimate.

8. Can I fix OBDII code B396C myself, or do I need a mechanic?

While some DIY enthusiasts may be able to diagnose and repair OBDII code B396C themselves, it is recommended to seek the expertise of a qualified mechanic, especially when dealing with complex electrical systems like the liftgate circuit.

9. Are there any preventive measures to avoid OBDII code B396C in the future?

To prevent OBDII code B396C from recurring, you can regularly inspect the liftgate system for any signs of wear or damage, avoid putting excessive strain on the liftgate, and address any liftgate-related issues promptly.

10. How long does it take to repair OBDII code B396C?

The time required to repair OBDII code B396C can vary based on the underlying cause and the complexity of the repairs needed. Simple fixes like replacing a faulty liftgate mode switch may take a few hours, while more intricate wiring repairs could take longer.