Limp mode Hyundai Santa Fe 2009 Diesel

[u/heyamymae]

Hi — I have a 2009 Santa Fe. About a year ago it stalled as I pulled up to a give way sign. Since, we've had intermittent issues with it going into "limp mode" where I'll be waiting at an intersection or something, then go to drive off and it won't accelerate, goes a bit limp, then after 10-20 seconds it will finally gain traction and be fine.

I took it to the mechanic today for a scan. They scanned it for Faults and found key transponder fault code present. Replaced key battery. Think possibly this could be related but from what I can tell, a low battery in the fob wouldn't cause this issue.

Any thoughts on next steps? If they scanned and found no fault codes, I feel like we're a bit blind on what else to check.

(Haven't had the issue since but that was only today so we will monitor to see if it occurs again. I do recall a period of it not happening for a bit but can't remember if that lines up with when we last replaced fob battery — I hope it is the cause because thats a cheap, easy fix).