AutoCodes – Chevrolet – B3377 Chevrolet

B3377 Chevrolet 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 Chevrolet 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 455

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 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B3377 Chevrolet 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 Chevrolet - Left Front Window Up Switch Circuit Low - AutoCodes.com — B3377 Chevrolet Code - Left Front Window Up Switch Circuit Low

What does this mean?

What are the Possible Causes of the DTC B3377 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 more information on how to fix the B3377 Chevrolet code? Get Access to Factory Service Manuals

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

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 Chevrolet Code

1. What does the OBDII code B3377 mean on a Chevrolet?

The code B3377 indicates a problem with the left front window up switch circuit, specifically that the circuit is reading a low voltage.

2. What are the symptoms of the B3377 code?

Common symptoms include the driverâ€™s side window not rolling up, intermittent window operation, or the window switch not responding.

3. What causes the B3377 code in a Chevrolet?

The code is typically caused by a faulty window switch, damaged wiring, a poor connection, or a malfunctioning window motor.

4. Can a blown fuse cause the B3377 code?

Yes, a blown fuse in the left front window circuit can result in a low voltage condition, triggering the B3377 code.

5. How do I diagnose the B3377 code on my Chevrolet?

Start by inspecting the window switch, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

6. Can I still drive my Chevrolet with the B3377 code?

Yes, the vehicle is safe to drive, but the left front window may not function properly, which can be inconvenient.

7. How do I fix the B3377 code?

Repairs may involve replacing the window switch, repairing damaged wiring, cleaning corroded connectors, or replacing a faulty window motor.

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

Repair costs can range from $50 to $200, depending on whether the issue lies with the switch, wiring, or motor.

9. Can I clear the B3377 code without fixing the issue?

You can clear the code with a scan tool, but if the underlying issue isnâ€™t resolved, the code will likely return.

10. Is the B3377 code common in Chevrolet vehicles?

Itâ€™s not a very common code, but it can occur in aging vehicles or those with electrical issues in the window control system.

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