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AutoCodes – Generic – B3377

B3377 Code - Left Front Window Up Switch Circuit Low

Quick Answer

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). Common causes include Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) 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
B3377 indicates Left Front Window Up Switch Circuit Low.
Common causes
Common causes include Faulty Driver Door Switch Assembly (DDSA), Driver Door Switch Assembly (DDSA) harness is open or shorted, Driver Door Switch Assembly (DDSA) 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 793
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 06, 2020
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Code B3377 Description

The window switch or window switch circuits that generate this Diagnostic Trouble Code (DTC) are built-in parts of the Driver Door Switch Assembly (DDSA). There are no external circuits. The DDSA internally supplies power and ground to the contacts of each of the integral window switches. When one of the switches is operated, the switch contacts close, providing the DDSA with a specific window switch signal. The DDSA processes this signal, assigns a digital message to it, and sends the message to the appropriate Driver Door Module (DDM), Passenger Front Door Module (PDM), Left Rear Door Module (LRDM), or Right Rear Door Module (RRDM), via the class 2 serial data circuit. The door module, upon receiving the message, examines other relevant information available on the class 2 serial data line in order to determine if conditions are correct for window operation to occur. If conditions are correct, the door module applies power and ground to the associated window motor and circuits in order to move the window. If the DDSA determines that one of its built in window switches is closed for more than 15 continuous seconds, it sets the DTC.
OBDII Code B3377 - Left Front Window Up Switch Circuit Low - AutoCodes.com
B3377 Code - Left Front Window Up Switch Circuit Low
What does this mean?

What are the Possible Causes of the DTC B3377?

  • Faulty Driver Door Switch Assembly (DDSA)
  • Driver Door Switch Assembly (DDSA) harness is open or shorted
  • Driver Door Switch Assembly (DDSA) circuit poor electrical connection
  • Faulty Driver Door Module (DDM)

How to Fix the DTC B3377?

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 B3377 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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Need Help with the Code?

Get the B3377 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

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 B3377 Code

1. What does OBDII code B3377 mean?

Code B3377 indicates a low voltage condition in the left front window up switch circuit, often caused by electrical issues.

2. What are the common symptoms of code B3377?

Symptoms include the left front window not moving up, intermittent operation, or the switch failing to respond.

3. What causes the B3377 code to appear?

Common causes include a faulty window switch, damaged wiring, poor electrical connections, or a malfunctioning window motor.

4. How can I diagnose code B3377?

Inspect the left front window switch for damage, check the wiring for continuity or shorts, and test the window motor for proper operation.

5. Can a blown fuse trigger code B3377?

Yes, a blown fuse in the window circuit can cause low voltage and trigger this code.

6. How do I fix code B3377?

Repairs may involve replacing the window switch, repairing damaged wiring, or replacing the window motor if it's faulty.

7. Is code B3377 dangerous to ignore?

While not dangerous, ignoring this code can leave the window inoperable, which may be inconvenient or affect security.

8. How much does it cost to repair code B3377?

Repair costs vary but typically range from $50 to $200, depending on whether the issue is a simple wiring repair or component replacement.

9. Can I reset code B3377 without repairing the issue?

You can clear the code with an OBDII scanner, but it will likely return unless the underlying issue is fixed.

10. Will code B3377 affect other vehicle systems?

Generally, this code only impacts the window operation and doesn't interfere with other systems unless it's part of a broader electrical issue.

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