Kia Sorento: Stop Lamp Switch Troubleshooting

Kia Sorento (MQ4, 2021-2026) Service Manual / Brake System / Brake System / Stop Lamp Switch Troubleshooting

Troubleshooting

Part diagnosis

Items

Cause

Symptom

Switch fuse

Faulty fuse connection, Damaged fuse

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble, ESC OFF light illuminated.

Brake System — Brake System / Stop Lamp Switch / Troubleshooting illustration

A waveform inspection is performed using an oscilloscope on each part during vehicle acceleration/braking. (Refer to stop lamp switch circuit inspection procedures)

Brake System — Brake System / Stop Lamp Switch / Troubleshooting illustration

Refer to the relevant repair procedures of the part when something abnormal is discovered in the waveform (Refer to the repair procedures of the relevant part and if necessary replace it)

Relay fuse

Faulty fuse connection, Damaged fuse

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESC OFF light illuminated.

Stop lamp switch

•	Damaged wiring of each part

•	Faulty connection to connector

•	Each part is defective

–	DTC Code : P0504

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESC OFF light illuminated.

Stop signal electronic module (If it applies)

–	DTC Code : P0504, C2130, C2131

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble , ESC OFF light illuminated.

Engine control module (ECM)

–	DTC Code : P0504

–	Symptom :Shifting gear trouble,Cruise control function cancelation trouble

Body control module (BCM)

–	Shifting gear trouble

Shift-lock solenoid

–	Shifting gear trouble

Inhibitor switch

–	Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble

Smart Key Unit (SMK)

–	Starting failure

Electronic parking brake

–	Symptom : EPB function cancelation trouble , ESC OFF light illuminated.

ABS/ESC control module
(Pressure sensor)

–	Symptom : ESC OFF light illuminated.

Symptom diagnosis

Symptom	Part that could be the cause
Trouble starting	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ABS/ESC control module, Each wire, Connector	Inspect waveform using an oscilloscope on each part during vehicle acceleration/braking. (Refer to stop lamp switch circuit inspection Procedures) Refer to the relevant repair procedures of the part when something abnormal is discovered in the waveform (Refer to the repair procedures of the relevant part and if necessary replace it)
Trouble shifting gears	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, BCM, ECM, Inhibitor switch, Each wire, Connector
ESC OFF light illuminated	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ABS/ESC control module, Each wire, Connector
P0504	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, ECM, Each wire, Connector
Stop lamp does notworking	Switch fuse, Relay fuse, Stop lamp switch, Stop signal electronic module, Wire/Connector disconnected
Stop lamp always turns on	Stop lamp switch, Stop signal electronic module, Wiring short circuit, Damaged fuse

3.	Refer to DTC guide when the related DTC codes are displayed.

Stop Lamp Switch Schematic Diagrams

System Circuit Diagram Schematic Diagram Terminal Function Teminal Descrip...

Stop Lamp Switch Repair procedures

Adjustment 1. Disconnect the (-) battery terminal. 2. Confirm the gap between stop lamp switch a...

Kia Sorento: Stop Lamp Switch Troubleshooting

See also:

Manuals list