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 MANUALSCHEVROLET2018SONIC LS, 1.8L ENG VIN H, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSKEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3120ACTION TAKEN WHEN THE DTC SETS
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic Trans
Action Taken When the DTC Sets
2018 Chevrolet Sonic LS, 1.8L Eng VIN H, Automatic TransSECTION Action Taken When the DTC Sets
Doors will not unlock/unlock when the passenger exterior door handle button is pressed.
RENDER: 1.0x
NO RELATED
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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.