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.
2018 Hyundai Sonata Plug-In HybridFACTORY OEM SERVICE PROCEDURE
Repair Procedures: Installation
NOTE:
[In the case of installing used ECM]
[In the case of installing new ECM]
- When replacing the ECM, the vehicle equipped with the immobilizer must be performed in order as the procedure below.
[In the case of installing used ECM]
- Perform "ECM Neutral mode" procedure with GDS.
(Refer to "SMART KEY or KEYLESS ENTRY AND BURGLAR ALARM (PHEV) ")
- After finishing "ECM Neutral mode", perform "Key teaching" procedure with GDS.
(Refer to "SMART KEY or KEYLESS ENTRY AND BURGLAR ALARM (PHEV) ")
[In the case of installing new ECM]
- Perform "Key teaching" procedure with GDS.
(Refer to "SMART KEY or KEYLESS ENTRY AND BURGLAR ALARM (PHEV) ")
Factory Service Tools
Use the Manual With the Right Hardware
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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.