FixVault

On Board Diagnosis Logic: Notes

The MIL will not light up for this self-diagnosis. 

DTC DETECTING CONDITION AND POSSIBLE CAUSES CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805 1805 Brake switch A brake switch signal is not sent to ECM for extremely long time while the vehicle is driving.
  • Harness or connectors (Stop lamp switch circuit is open or shorted.)
  • Stop lamp switch