F 550 4WD Super Duty V8-7.3L DSL Turbo VIN F (2001)
P1805 - P1809: Testing and Inspection
P1806
P1806 is an information code (there is no testing for this code).
Code Description: Transmission 4-Wheel Drive High Indicator Short Circuit to Battery.
Refer to wiring diagrams to diagnose this circuit, See: Transmission and Drivetrain/Transfer Case/Diagrams
If there is no link in the chart then:
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This code is not a valid code for this vehicle
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Or information published by the manufacturer for this vehicle did not include this code
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For complete diagnosis of the Transfer Case, follow this link: See: Transmission and Drivetrain/Transfer Case/Testing and Inspection