2016 Hyundai Elantra GT - glow plug relay location

where is the Glow plug relay location so that I can get a PCM software reset on my 2016 Hyundai Elantra GT

This is strictly a wild guess but it might be integrated into the fuse box. I wasn’t aware Hyundai made a diesel version so it sounds like you’re outside the U.S.

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No idea, but that sort of info is often found in the owner’s manual. I’d guess the car’s designers would logically place an engine related relay somewhere easily accessed in the engine compartment. If no info in owner’s manual, there may be a label in the engine compartment that id’s all the relays and fuses located there. Look on under-side of hood too.

Just curious , why is the glow plug relay involved with a pcm software reset?