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.

2017 Hyundai Sonata Plug-In HybridFACTORY OEM SERVICE PROCEDURE

Repair Procedures: Inspection

Turn ignition switch OFF.
Remove the Hybrid Power Control Unit (HPCU) assembly.
Disconnect the solenoid valve connector (A).

Fig 1: Locating Solenoid Valve Connector
Courtesy of HYUNDAI MOTOR AMERICA
Measure the resistance between + terminal (9) and - terminal (13).

Fig 2: Solenoid Valve Connector Connector End View
Courtesy of HYUNDAI MOTOR AMERICA

Check that the resistance is within the specification.

Temp.[ (°C)°F]	Resistance (kΩ)
(-40)-40	48.1
(-20)-4.0	15.6
(0)32.0	5.88
(20)68.0	2.51
(40)104.0	1.19
(60)140.0	0.61
(80)176.0	0.32
(100)212.0	0.18
(120)248.0	0.11
(140)284.0	0.07
(165)329.0	0.04

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.