Engine-Codes.com
Engine-Codes – GMC – B3377 GMC

B3377 GMC Code - Left Front Window Up Switch Circuit Low

Quick Answer

The B3377 GMC code indicates a problem with the left front window up switch circuit being low. Common causes include Faulty window switch, Wiring issues in the circuit, Defective window motor. 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 GMC indicates Left Front Window Up Switch Circuit Low.
Common causes
Common causes include Faulty window switch, Wiring issues in the circuit, Defective window motor.
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 Aug 19, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B3377 GMC Description

The B3377 GMC code indicates a problem with the left front window up switch circuit being low. This means that there is a low voltage or resistance in the circuit that controls the front left window going up. The window switch circuit is responsible for sending signals to the window motor to raise the window. When this circuit is low, it can cause issues with the window operation, such as the window not going up or experiencing delays in movement. It can also potentially lead to other electrical problems in the vehicle if left unaddressed.

OBDII Code B3377 GMC - Left Front Window Up Switch Circuit Low
B3377 GMC Code - Left Front Window Up Switch Circuit Low

Common Causes of B3377 GMC

  1. Faulty window switch
  2. Wiring issues in the circuit
  3. Defective window motor
  4. Poor connection or corrosion in the electrical system
  5. Issues with the body control module

Symptoms of B3377 GMC

  1. Left front window not responding to up switch
  2. Window goes up slowly or intermittently
  3. Power window switch not working
  4. Window gets stuck in a partially open position
  5. Inconsistent operation of the left front window

How to Fix B3377 GMC

  1. Diagnose the issue by testing the window switch, wiring, and window motor for faults
  2. Replace the faulty window switch if needed
  3. Check and repair any damaged wiring or connections in the circuit
  4. Replace the window motor if it is found to be defective
  5. Reset the body control module if necessary

Cost to Fix B3377 GMC

The typical repair costs for resolving the B3377 GMC code can range from $150 to $400, depending on the specific cause of the issue and the parts that need to be replaced. This estimate includes both parts and labor. It's important to note that labor rates at auto repair shops can vary, so it's recommended to check with local shops for a more accurate estimate.

Need more information about the B3377 GMC code?

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

Need Help with the Code?

Get the B3377 GMC 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 GMC Code

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

Code B3377 indicates a problem with the Left Front Window Up Switch Circuit, specifically a low voltage condition detected.

2. What are the symptoms of a B3377 code on a GMC?

Symptoms include the left front window not rolling up, intermittent window operation, or no response from the window switch.

3. What causes a B3377 code on a GMC vehicle?

Common causes include a faulty window switch, damaged wiring or connectors in the circuit, or a malfunctioning window motor.

4. How can I diagnose a B3377 code on my GMC?

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

5. Can a blown fuse cause the B3377 code on a GMC?

Yes, a blown fuse in the power window circuit can cause low voltage and trigger the B3377 code.

6. How do I fix the B3377 code on my GMC?

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

7. Can I drive my GMC with a B3377 code?

Yes, the vehicle can still operate, but the left front window may not function properly, which could be inconvenient or unsafe in certain conditions.

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

Costs vary depending on the issue, but replacing a window switch typically costs $50-$150, while wiring repairs may cost more if extensive damage is present.

9. Does the B3377 code require reprogramming after repairs?

Typically, no reprogramming is needed after fixing the circuit or replacing the switch, but clearing the code with a scan tool is recommended.

10. Can a faulty Body Control Module (BCM) cause the B3377 code?

While rare, a malfunctioning BCM could contribute to the issue if it’s failing to send the proper signals to the window circuit.

Discuss the causes and fixes for B3377 GMC OBDII Code

Submit a New Comment

Code B3377 GMC comments

No comments found for this page.