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 MANUALSKIA2021FORTE GT, AUTOMATIC DCT TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLELECTRONIC STABILITY CONTROL DIAGNOSISDTC C1604-04: ECU HARDWARE ERRORCOMPONENT INSPECTIONNOTES

2021 Kia Forte GT, Automatic DCT Trans

Component Inspection: Notes

2021 Kia Forte GT, Automatic DCT TransSECTION Notes

Ignition "OFF".
Connect KDS to Data Link Connector (DLC).
Ignition "ON".
Select "Diagnostic Trouble Codes (DTCs)" mode.
Using a KDS, Clear DTC.
Operate the vehicle within DTC Detecting Condition in General Information.
Select "Diagnostic Trouble Codes (DTCs)" mode again.
Is the same DTC stored in the system?
Good
- Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
- Repair or replace as necessary and then go to "VERIFICATION OF REPAIR " procedure.
No Good
- Carefully re-do this troubleshooting guide steps.
- If no problems were found with the circuits or connectors, replace the ESC module and go to "VERIFICATION OF REPAIR " procedure.
  * In case of replacing ESC module, perform following "Vehicle S/W Management" procedures.

CAUTION: In case of replacing ESC module, perform following procedures.

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.