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 MANUALSKIA2015OPTIMA LXREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLELECTRONIC STABILITY CONTROL (ESC) SYSTEM - OPTIMA (EXCEPT HEV)ESC CONTROL MODULEREPAIR PROCEDURESREMOVAL

2015 Kia Optima LX

Repair Procedures: Removal

2015 Kia Optima LXSECTION Removal

Turn the ignition switch OFF.
Remove the air duct (B) and air cleaner assembly (A).

Fig 1: Air Duct & Air Cleaner Assembly
Courtesy of KIA MOTORS AMERICA, INC.
Remove the ECM connector (B) and the arrange the wiring harness (A).

Fig 2: ECM Connector & Wiring Harness
Courtesy of KIA MOTORS AMERICA, INC.
Pull up the lock of the HECU connector (A), then disconnect the connector.

Fig 3: HECU Connector Lock
Courtesy of KIA MOTORS AMERICA, INC.
Remove the brake fluid from the master cylinder reservoir with a syringe.
CAUTION:
- Be sure to completely remove foreign substances from around brake fluid reservoir and cap before opening the reservoir cap. If not, it may cause contamination of brake fluid and deterioration in braking performance.
- Do not spill brake fluid on the vehicle, it may damage the paint; if brake fluid does contact the paint, wash it off immediately with water.
Disconnect the brake tubes from the HECU by unlocking the nuts counterclockwise with a spanner.
Tightening Torque:

M10: 11.7 ~ 15.7 N.m (1.2 ~ 1.6 kgf.m, 8.7 ~ 11.6 lb-ft)

M12: 18.6 ~ 22.6 N.m (1.9 ~ 2.3 kgf.m, 13.7 ~ 16.6 lb-ft)

Fig 4: Brake Tubes
Courtesy of KIA MOTORS AMERICA, INC.
Loosen the HECU bracket bolts (A), then remove HECU and bracket.
Tightening Torque:

19.6 ~ 29.4 N.m (2.0 ~ 3.0 kgf.m, 14.5 ~ 21.7 lb-ft)

Fig 5: HECU Bracket Bolts
Courtesy of KIA MOTORS AMERICA, INC.

RENDER: 1.0x

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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.