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.
2015 Kia Optima SXFACTORY OEM SERVICE PROCEDURE
Engine Control System Diagnosis (3 Of 3) - 2.4L (Except HEV)
- DTC Index
- DTC P0642: Sensor Specified Voltage 'A' Circuit Low
- DTC P0643: Sensor Specified Voltage 'A' Circuit High
- DTC P0652: Sensor Specified Voltage 'B' Circuit Low
- DTC P0653: Sensor Specified Voltage 'B' Circuit High
- DTC P0661: Intake Manifold Tuning Valve Control Circuit Low (Bank 1)
- DTC P0662: Intake Manifold Tuning Valve Control Circuit High (Bank 1)
- DTC P0698: Sensor Specified Voltage 'C' Circuit Low
- DTC P0699: Sensor Specified Voltage 'C' Circuit High
- DTC P06A4: Sensor Specified Voltage 'D' Circuit Low
- DTC P06A5: Sensor Specified Voltage 'D' Circuit High
- DTC P2096: Post Catalyst Fuel Trim System Too Lean (Bank 1)
- DTC P2097: Post Catalyst Fuel Trim System Too Rich (Bank 1)
- DTC P2101: Throttle Actuator Control Motor Circuit Range/Performance
- DTC P2104: Throttle Actuator Control System - Forced Idle
- DTC P2105: Throttle Actuator Control System-Force Engine Shutdown
- DTC P2106: Throttle Actuator Control System-Force Limited Power
- DTC P2110: Throttle Actuator Control System - Forced Limited RPM
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance
- DTC P2122: Throttle/Pedal Position Sensor/Switch 'D' Circuit Low Input
- DTC P2123: Throttle/Pedal Position Sensor/Switch 'D' Circuit High Input
- DTC P2127: Throttle/Pedal Position Sensor/Switch 'E' Circuit Low Input
- DTC P2128: Throttle/Pedal Position Sensor/Switch 'E' Circuit-High Input
- DTC P2138: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
- DTC P2146: Fuel Injector Section 'A' Supply Voltage Circuit/Open
- DTC P2147: Fuel Injector Section 'A' Supply Voltage Circuit Low
- DTC P2148: Fuel Injector Section 'A' Supply Voltage Circuit High
- DTC P2149: Fuel Injector Section 'B' Supply Voltage Circuit/Open
- DTC P2150: Fuel Injector Section 'B' Supply Voltage Circuit Low
- DTC P2151: Fuel Injector Section 'B' Supply Voltage Circuit High
- DTC P2153: Fuel Injector Section 'C' Supply Voltage Circuit Low
- DTC P2154: Fuel Injector Section 'C' Supply Voltage Circuit High
- DTC P2156: Fuel Injector Section 'D' Supply Voltage Circuit Low
- DTC P2157: Fuel Injector Section 'D' Supply Voltage Circuit High
- DTC P2159: Vehicle Speed Sensor 'B' Range/Performance (Wheel Speed Sensor)
- DTC P2187: System Too Lean At Idle (←Additive) (Bank 1)
- DTC P2188: System Too Rich At Idle (Bank 1)
- DTC P2191: System Too Lean At Higher Load (Multiple) (Bank 1)
- DTC P2192: System Too Rich At Higher Load (Bank 1)
- DTC P2195: O2 Sensor Signal Stuck Lean (Bank 1/Sensor 1)
- DTC P2196: O2 Sensor Signal Stuck Rich (Bank 1/Sensor 1)
- DTC P2237: O2 Sensor Pumping Current Circuit/Open (Bank 1/Sensor 1)
- DTC P2243: O2 Sensor Specified Voltage Circuit/Open (Bank 1/Sensor 1)
- DTC P2251: O2 Sensor Specified Ground Circuit/Open (Bank 1/Sensor 1)
- DTC P2270: O2 Sensor Signal Stuck Lean (Bank 1/Sensor 2)
- DTC P2271: O2 Sensor Signal Stuck Rich (Bank 1/Sensor 2)
- DTC P2297: O2 Sensor Out Of Range During Deceleration - (Bank 1/Sensor 1)
- DTC P2414: O2 Sensor Exhaust Sample Error (Bank 1/Sensor 1)
- DTC P2502: Battery Voltage Rationality
- DTC P2503: No Battery Charge
- DTC P2610: ECM/PCM Internal Engine OFF Timer Performance
- DTC P2626: O2 Sensor Pumping Current Trim Circuit/Open (Bank 1/Sensor 1)
- DTC U0001: High Speed CAN Communication Bus OFF
- DTC U0101: Lost Communication With TCM
- DTC U1111: Battery Sensor Fault Detected By ECU
- DTC U1112: LIN Communication Error
Factory Service Tools
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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.
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