The longest serving four-time chief minister of the hill state called on Sonia along with her political secretary Ahmed Patel, party sources said.
Singh, according to them, wants the state Congress chief Sukhwinder Singh Sukhu, a known detractor of the chief minister, removed.
The meeting lasted about half-an-hour, and sources close to Singh termed it as "positive". They said they were hopeful of an early resolution of the issues plaguing the party ahead of the polls.
Himachal is among four states that a weakened Congress currently governs. It has its governments in Karnataka, Punjab, Meghalaya and Mizoram, besides the Union Territory of Puducherry.
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Singh had earlier written to Sonia that he would neither contest the election nor lead the party at the hustings if the current situation continued. He had reportedly conveyed this also to his supporters and MLAs backing him in his fight against Sukhu.
Party sources said further discussions would be held to defuse the situation after Congress vice president Rahul Gandhi returns from Norway.