When your 2020 Lexus ES power trunk motor makes grinding noises during operation, something is wearing out or binding in the power lift system. Addressing the noise promptly prevents complete failure and potential damage to the trunk system.
Power Trunk System Components
The ES's power trunk uses electric motors (typically one or two) working with gas struts to raise and lower the trunk lid. The motors drive mechanical linkages that apply force to the lid. Grinding usually indicates motor gear wear, binding, or mechanical resistance the motor is fighting against.
Sources of Grinding Noise
Grinding sounds typically come from: worn motor gears no longer meshing smoothly, dry or damaged motor bearings, motor fighting against weak or seized gas struts, binding in the trunk hinges, misaligned lift mechanism, or foreign debris in the mechanism. The noise often worsens over time as components further degrade.
Observing the Symptoms
Note when grinding occurs: during opening only, closing only, or both. Is the trunk movement slower than normal? Does it stop or struggle at certain positions? Does the noise vary with trunk position? These details help identify whether the motor, struts, or mechanical parts are the issue.
Diagnostic Steps
Open and close the trunk while listening carefully to locate the noise source. Try lifting/lowering the trunk manually (with power off) to check for mechanical binding. Test strut support by holding the lid partially open—it shouldn't fall quickly. Check for debris in the hinge area. Have the motor current draw tested.
Repair Options
Power trunk motor replacement for worn motors. Gas strut replacement if they're weak and creating motor strain. Lubrication of hinges and pivots if binding. Mechanism realignment if misaligned. Complete lift system service for multiple issues. Address problems promptly before grinding leads to complete failure.