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B1801: Lamp Turn Signal Front Output Circuit Short To Ground

OTHER
System
Manufacturer-Specific Body
Last reviewed: Last updated:

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does B1801 Mean?

B1801 is a manufacturer-specific diagnostic trouble code: Lamp Turn Signal Front Output Circuit Short To Ground. This code applies to OTHER vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of B1801

Frequently Asked Questions

What does B1801 mean?
Lamp Turn Signal Front Output Circuit Short To Ground. This is a manufacturer-specific code for OTHER vehicles.
Which vehicles get code B1801?
This code appears primarily in OTHER vehicles. Check your owner's manual or a dealer for model-specific information.
Can I fix this myself?
Manufacturer-specific codes often require a brand-specific diagnostic scanner for full data. A dealer or specialist with the right tools will diagnose it most accurately.

Reported Repair Costs for B1801

Based on 14 owner-reported repair costs from NHTSA complaints.

Low End
$112
Typical
$570
High End
$933

⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.

What To Do Next

  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

B1800 Lamp Turn Signal Front Output Circuit Short To Battery B1802 Lamp Turn Signal Rear Output Circuit Failure B1803 Lamp Turn Signal Rear Output Circuit Open B1804 Lamp Turn Signal Rear Output Circuit Short To Battery B1805 Lamp Turn Signal Rear Output Circuit Short To Ground B1806 Lamp Tail Output Circuit Failure B1807 Lamp Tail Output Circuit Open B1808 Lamp Tail Output Circuit Short To Battery B1809 Lamp Tail Output Circuit Short To Ground B1810 Lamp Backup Switch Input Circuit Failure