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B3397 Buick Code - Left Rear Window Up Switch Circuit Low

Quick Answer

The B3397 diagnostic trouble code (DTC) for Buick vehicles indicates a problem with the left rear window up switch circuit being at a low voltage level. Common causes include Faulty left rear window up switch, Wiring or connection issues in the switch circuit, BCM malfunction. 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
B3397 Buick indicates Left Rear Window Up Switch Circuit Low.
Common causes
Common causes include Faulty left rear window up switch, Wiring or connection issues in the switch circuit, BCM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code B3397 Buick Description

The B3397 diagnostic trouble code (DTC) for Buick vehicles indicates a problem with the left rear window up switch circuit being at a low voltage level. This code is typically triggered when the Body Control Module (BCM) detects an abnormal voltage reading from the switch circuit. The left rear window up switch is responsible for controlling the upward movement of the left rear window in the vehicle. When this circuit is experiencing a low voltage condition, it can lead to issues with operating the window properly.

OBDII Code B3397 Buick - Left Rear Window Up Switch Circuit Low
B3397 Buick Code - Left Rear Window Up Switch Circuit Low

Common Causes of B3397 Buick

  1. Faulty left rear window up switch
  2. Wiring or connection issues in the switch circuit
  3. BCM malfunction
  4. Power supply issues
  5. Water or moisture damage to the switch circuit

Symptoms of B3397 Buick

  1. Left rear window not responding to switch input
  2. Slow or erratic movement of the left rear window
  3. Window getting stuck in a partially open or closed position
  4. Inability to control the left rear window from the driver's seat

How to Fix B3397 Buick

  1. Begin by inspecting the left rear window up switch for any visible damage or signs of wear. Replace the switch if necessary.
  2. Check the wiring and connections in the switch circuit for any breaks, corrosion, or loose connections. Repair or replace damaged wiring as needed.
  3. Test the BCM for proper functionality and replace if it is found to be faulty.
  4. Verify the power supply to the switch circuit and ensure it is within the specified voltage range.
  5. Clear the DTC from the vehicle's memory using a diagnostic scan tool after completing the repairs.

Cost to Fix B3397 Buick

The typical repair costs for addressing the B3397 code on a Buick vehicle can range from $100 to $300, depending on the extent of the issue and the specific repairs needed. This estimate includes the cost of parts such as a new switch, wiring repairs, and labor charges. It is important to note that the actual cost may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the type of engine. Additionally, diagnostic time and labor rates can vary, with rates typically ranging between $80 and $150 per hour. It is recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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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 B3397 Buick Code

1. What are the common symptoms of OBDII code B3397 in a Buick related to the left rear window up switch circuit?

- The common symptoms include the left rear window being stuck in the up position and the switch on the driver's side not functioning properly.

2. What are the possible causes of OBDII code B3397 in a Buick indicating a low left rear window up switch circuit?

- The code B3397 in a Buick may be triggered by a faulty left rear window switch, damaged wiring, or a malfunctioning window control module.

3. How can I diagnose the issue causing OBDII code B3397 in my Buick related to the left rear window switch circuit?

- You can start by checking the left rear window switch for proper functionality, inspecting the wiring for any damage, and testing the window control module for any faults.

4. Can a DIY enthusiast repair OBDII code B3397 Buick issue concerning the left rear window switch circuit?

- Yes, if you have experience working with automotive electrical systems, you may be able to repair the issue by replacing the faulty switch, repairing damaged wiring, or resetting the window control module.

5. Is it safe to continue driving my Buick with OBDII code B3397 indicating a low left rear window up switch circuit?

- While it may be safe to drive, it is recommended to address the issue promptly to avoid any inconvenience or potential safety hazards associated with a malfunctioning window switch.

6. How much does it typically cost to repair OBDII code B3397 in a Buick related to the left rear window switch circuit?

- The cost of repairing OBDII code B3397 can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Can extreme weather conditions affect the left rear window switch circuit in a Buick and trigger OBDII code B3397?

- Yes, extreme weather conditions like heat or moisture can potentially damage the wiring or components in the left rear window switch circuit, leading to the triggering of code B3397.

8. Will disconnecting the car battery reset OBDII code B3397 in a Buick indicating a low left rear window up switch circuit?

- Disconnecting the car battery may reset the code temporarily, but if the underlying issue with the left rear window switch circuit is not addressed, the code is likely to reappear.

9. Can a faulty left rear window motor cause OBDII code B3397 in a Buick associated with the left rear window up switch circuit?

- While a faulty window motor may not directly cause code B3397, it is still recommended to check the motor's functionality as part of diagnosing the issue with the left rear window switch circuit.

10. Are there any recalls or technical service bulletins related to OBDII code B3397 Buick issue concerning the left rear window up switch circuit?

- It is advisable to check with the manufacturer or a certified Buick service center to inquire about any recalls or technical service bulletins related to OBDII code B3397 and the left rear window switch circuit.

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