Pargeter plays Chas Dingle, who was recently left shell-shocked after bad boy ex-fiancé Carl King attempted to blackmail her.
The character is set to play a large role in the special 40th anniversary live episode, but Pargeter claims she has a "real burping problem" which might prove embarrassing.
The actress revealed to the Daily Star: "Everyone on set is used to it by now. But I'm seriously worried that I'll do it during the live episode at totally the wrong moment."
Pargeter went on to say that she knows it "sounds stupid", but that she has had to seek medical attention.
"I've even been to the doctors about it but they have told me there's nothing I can do," she explained.
"New cast members must think I'm so rude at first but seriously, there's nothing I can do!"
Co-star Sammy Winward also recently revealed that she fears she might ruin the live episode, but by laughing rather than burping.
The episode will be Pargeter's first experience with live TV, and she revealed that while her personal nerves are beginning to creep in, the show must go on: "I'm bricking it! The show as a whole is a massive machine, and we are merely the last link.
"As long as we say our words right, we're just putting the little sprinkle on the top."