B3377 GMC 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 GMC 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.
Code B3377 GMC Description
What are the Possible Causes of the DTC B3377 GMC?
- 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 GMC?
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 GMC 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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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
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