Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSKIA2020SOUL LX, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSIMMOBILIZER DIAGNOSISDTC P1688: IMMOBILIZER LOCKDTC INFORMATIONDTC DETECTING CONDITION

2020 Kia Soul LX, Standard Trans

DTC Information: DTC Detecting Condition

2020 Kia Soul LX, Standard TransSECTION DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	Check the communication status between ECM/PCM and KDS	Check for "LEARNT" ECM/PCM PIN code Check for "LEARNT" ECM/PCM password
Enable Condition	Ignition "ON" Normal battery voltage is 9 to 16V
Threshold Value	Invalid PIN or password is inputted for more than 3 times
Detecting Time	Immediately
Erase Condition	Normal PIN or password received DTC erasing with KDS Auto delete after standing for 1 hour at B+ power (Lock timer initialize when power reset)

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.