His co-drivers have been (in chronological order) Ron Teoh, Allen Oh and John Bennie.

In 2005, Singh began facing trouble in finding sponsors, and was unable to participate in half out of the eight rounds in the FIA Asia Pacific Rally Championship.

His team itself did not have enough money to pay for mechanics and maintenance of his vehicle, and due to his absence from so many rounds in the championship, the FIA slapped him with a fine of 10,000 Euros.

Singh did not even have enough money to ship his vehicle back to Malaysia from New Zealand, which itself would cost about RM57,000.

When informed, the Prime Minister of Malaysia, Abdullah Ahmad Badawi reportedly asked: "If Karamjit is a Malaysian and has been producing results and bringing honour to the country, why has support not been accorded to him?"