The Mumbai-based entity has yet to apply for a re-certification for federal emissions with the Environmental Protection Agency of the American government.
The validity of the document is to expire this year-end. M&M is also embroiled in a legal dispute with Global Vehicles Inc of Texas over distribution and sales of its vehicles in that country.
It was last year that the EPA awarded the certification to the 1945-founded automotive company, allowing it to sell its pick-ups in the US market.
The certification pertained to two M&M models (TR20 and TR40) for the 2011 calendar year.
Now, the company will have to submit vehicles for federal emissions and safety testing all over again, sources said.
The earlier pick-ups, powered by India-made diesel engines, were based on the Scorpio model.
Pick-ups may not be that popular in India, but the US is the world's largest market for it.
Reports state the pick-up vehicles did not live up to the fuel-efficiency levels as promised by Mahindra, falling well short of its its target.
Under testing, the pick-ups delivered 19 to 21 miles per gallon under city and highway driving conditions, falling short of the company's claimed mileage of 30 miles per gallon.
M&M had hoped to benefit from the absence of competition in the segment it was planning to enter.
According to M&M, no company has a presence in the compact pick-up segment, whose engines are powered by diesel.
With petrol prices soaring and waning demand for compact pick-ups powered by petrol, M&M had been counting on its diesel pick-ups to regenerate demand.
When contacted, the company did not elaborate on its plans for the US market.
"It is an on-going process for us," said an M&M spokesperson. "Since the matter is under litigation, we cannot comment
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