[8] Wahi started his acting career with the 2004 "Rose Audio Visuals" television series Remix, where he portrayed the lead role of Ranveer Sisodia, the angry lover boy character, opposite Shweta Gulati.

[12] In March 2008, Wahi was a contestant in the celebrity talent hunt show Mr. & Ms. TV judged by filmmaker Madhur Bhandarkar and actress Sonali Bendre.

[13] After a break from fiction shows, Wahi made a comeback in the 2009 Colors TV's soap opera Mere Ghar Aayi Ek Nanhi Pari as the male lead opposite Mugdha Chaphekar.

[14][15][16][17] By the following year, he starred played Dr. Siddhant Modi in Cinevistaas Limited productions' medical drama series Dill Mill Gayye opposite Jennifer Winget.

[18][19][20] Wahi was also seen playing the supporting role of a fun-loving guy, Rohan in mid-December 2011 on Sony Entertainment Television's romance-drama series Kuch Toh Log Kahenge.

[29][30] Wahi entered as a wild card in the fifth season of BBC Productions' celebrity dance reality show Jhalak Dikhhla Jaa, but was eliminated next month.

[39][40][41] Wahi also signed to play the male lead opposite Rhea Chakraborty in the 2014 romantic drama film Babbu Ki Jawani, produced by Amritpal Singh Bindra, under the UTV Spotboy productions.

In March 2015, he participated in the reality game show India Poochega Sabse Shaana Kaun?, hosted by actor Shah Rukh Khan.

[58] After a gap of 6 years, Wahi made a comeback to television, in July 2022 with Star Bharat's show Channa Mereya as Aditya Raj Singh, opposite Niyati Fatnani.

[62] Reviewing the second season, Bhawna Arya stated, "Karan as Jogi, brings a unique vibe to his role; however, the writing holds his character back.