AutoCodes – Cadillac – B396C Cadillac

B396C Cadillac 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 Cadillac 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 2,364

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

What does this mean?

What are the Possible Causes of the DTC B396C Cadillac?

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 Cadillac?

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 Cadillac 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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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 Cadillac Code

1. What are the common symptoms of OBDII code B396C in a Cadillac related to the Liftgate Mode Switch Circuit?

- Common symptoms include issues with the liftgate not opening or closing properly, failure of the liftgate to respond to electronic controls, and an illuminated warning light on the dashboard.

2. What are the possible causes of the B396C code in a Cadillac indicating Liftgate Mode Switch Circuit Performance Signal Invalid?

- The code may be triggered by a faulty liftgate mode switch, damaged wiring or connectors in the circuit, a malfunctioning liftgate control module, or a software issue.

3. How can I diagnose the B396C code in my Cadillac?

- Diagnosis usually involves using an OBDII scanner to read the code and then performing a visual inspection of the liftgate mode switch, wiring, and connectors. Testing the switch and related components for proper functionality is also necessary.

4. Can I continue driving my Cadillac with the B396C code present?

- It is not recommended to continue driving with the B396C code as it can lead to further damage to the liftgate system and compromise safety. It is best to address the issue promptly.

5. What are some repair tips for fixing the B396C code in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the liftgate mode switch if faulty, updating software if necessary, or reprogramming the liftgate control module.

6. Is it safe to manually operate the liftgate if the B396C code is triggered in my Cadillac?

- It is generally safe to manually operate the liftgate if the code is present, but it is advisable to address the underlying issue to ensure proper functioning of the electronic controls.

7. Can weather conditions affect the occurrence of the B396C code in a Cadillac?

- Extreme weather conditions or exposure to moisture can sometimes lead to electrical issues, potentially triggering the B396C code related to the Liftgate Mode Switch Circuit in a Cadillac.

8. How much does it typically cost to repair the B396C code in a Cadillac?

- Repair costs can vary depending on the specific cause of the code and the labor rates of the repair shop. It is recommended to obtain quotes from different service providers for an accurate cost estimate.

9. Are there any recalls or technical service bulletins related to the B396C code in Cadillac vehicles?

- It is advisable to check with a Cadillac dealership or the manufacturer's website for any recalls or technical service bulletins related to the B396C code and the Liftgate Mode Switch Circuit in specific models.

10. Can I reset the B396C code in my Cadillac using an OBDII scanner?

- While an OBDII scanner can clear the code temporarily, it is important to address the underlying issue causing the B396C code to prevent it from reoccurring.