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P1806: Transmission 4-Wheel Drive High Indicator Short Circuit To Battery

FORD LINCOLN MERCURY OTHER
Severity
Medium
System
Manufacturer-Specific Powertrain

What Does P1806 Mean?

P1806 is a manufacturer-specific diagnostic trouble code: Transmission 4-Wheel Drive High Indicator Short Circuit To Battery. This code applies to FORD, LINCOLN, MERCURY, 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 P1806

Common Causes

Frequently Asked Questions

What does P1806 mean?
P1806 indicates: Transmission 4-Wheel Drive High Indicator Short Circuit To Battery. The vehicle's computer has detected that the Transmission 4-Wheel Drive High Indicator Short is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1806?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1806 for extended periods may cause additional problems.
How much does it cost to fix P1806?
Repair costs for P1806 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair Transmission 4-Wheel Drive High Indicator Short wiring and connectors
  • 🔧 Replace faulty Transmission 4-Wheel Drive High Indicator Short
  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

P1800 Transmission Clutch Interlock Safety Switch Circuit Failure P1801 Transmission Clutch Interlock Safety Switch Open Circuit P1802 Transmission Clutch Interlock Safety Switch Short Circuit To Battery P1803 Transmission Clutch Interlock Safety Switch Short Circuit To Ground P1804 Transmission 4-Wheel Drive High Indicator Circuit Failure P1805 Transmission 4-Wheel Drive High Indicator Open Circuit P1807 Transmission 4-Wheel Drive High Indicator Short Circuit To Ground P1808 Transmission 4-Wheel Drive Low Indicator Circuit Failure P1809 Transmission 4-Wheel Drive Low Indicator Open Circuit P1810 TFP Valve Position Switch Circuit/ Transmission 4-Wheel Drive Low Indicator Short Circuit To Battery