DTC C1340: Stoplight Switch: Notes

WARNING: This page is about a different car, the 2017 Mitsubishi Mirage. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

When more than one stoplight do not illuminate due to a blown bulb, this DTC may be set. Diagnose the rear combination light (Refer to THE STOPLIGHT DO NOT ILLUMINATE OR GO OUT NORMALLY ).
If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE .
Whenever ECU is replaced, ensure that the CAN bus lines are normal.
When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the G and yaw rate sensor and the steering wheel sensor (Refer to MEASURES FOR DISCHARGED BATTERY and STEERING WHEEL SENSOR CALIBRATION ).