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 MANUALSHYUNDAI2014SONATA HYBRID BASEREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSGENERAL INFORMATION (FUEL SYSTEM) (HEV)TROUBLESHOOTINGBASIC TROUBLESHOOTINGSYMPTOM TROUBLESHOOTING GUIDE CHART

2014 Hyundai Sonata Hybrid Base

Symptom Troubleshooting Guide Chart

2014 Hyundai Sonata Hybrid BaseSECTION Symptom Troubleshooting Guide Chart

SYMPTOM TROUBLESHOOTING GUIDE REFERENCE CHART

Main symptom	Diagnostic procedure	Also check for
Unable to start (Ready symbol does not appear on the center of dash)	Test the battery Test the starter Inhibitor switch (A/T) or clutch start switch (M/T)
Engine does not run when requested (Incomplete combustion)	Test the battery Check the fuel pressure Check the ignition circuit Troubleshooting the immobilizer system (In case of immobilizer lamp flashing)	DTC Low compression Intake air leaks Slipped or broken timing belt Slipped or broken HSG belt Contaminated fuel
Engine struggle to run when requested	Test the battery Check the fuel pressure Check the ECT sensor and circuit (Check DTC) Check the ignition circuit	DTC Low compression Intake air leaks Contaminated fuel Weak ignition spark
Poor idling (Rough, unstable or incorrect Idle)	Check the fuel pressure Check the Injector Check the long term fuel trim and short term fuel trim Check the idle speed control circuit (Check DTC) Inspect and test the Throttle Body Check the ECT sensor and circuit (Check DTC)	DTC Low compression Intake air leaks Contaminated fuel Weak ignition spark
Engine stall	Test the Battery Check the fuel pressure Check the idle speed control circuit (Check DTC) Check the ignition circuit Check the CKPS Circuit (Check DTC)	DTC Intake air leaks Contaminated fuel Weak ignition spark
Poor driving (Surge)	Check the fuel pressure Inspect and test Throttle Body Check the ignition circuit Check the ECT Sensor and Circuit (Check DTC) Test the exhaust system for a possible restriction Check the long term fuel trim and short term fuel trim	DTC Low compression Intake air leaks Contaminated fuel Weak ignition spark
Knocking	Check the fuel pressure Inspect the engine coolant Inspect the radiator and the electric cooling fan Check the spark plugs	DTC Contaminated fuel
Poor fuel economy	Check customer's driving habitsIs A/C on full time or the defroster mode on? Are tires at correct pressure? Is excessively heavy load being carried? Is acceleration too much, too often? Check the fuel pressure Check the injector Test the exhaust system for a possible restriction Check the ECT sensor and circuit	DTC Low compression Intake air leaks Contaminated fuel Weak ignition spark
Hard to refuel (Overflow during refueling)	Test the canister close valve Inspect the fuel filler hose/pipe Pinched, kinked or blocked? Filler hose is torn Inspect the fuel tank vapor vent hose between the EVAP. canister and air filter Check the EVAP. canister	Malfunctioning gas station filling nozzle (If this problem occurs at a specific gas station during refueling)

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.