The bank cannot impound your passport for any reason.
If the loan becomes NPA and you being a guarantor then the bank may have to take suitable action to recover the amount from the guarantors as per law.
They cannot give such threats to the guarantors.
The bank is free to attach and sell the assets of the guarantor to apply the sale proceeds towards the repayment of loan, but it cannot apply for impounding of passport unless there is an apprehension that the guarantor will alienate the mortgaged assets and fly out of India with sale proceeds thereof.
It is not a joke to impound somebody's passport by a notice by any organization.
Freedom of movement is a Constitutional right. A citizen is given the liberty to travel, work and reside at any place where he or she wants.
The same can be curtailed only as per the procedure established by law.
The question that arises now is can a passport be impounded by exercising power under section 102 read with section 165 and 104 of the Code of Criminal Procedure, 1973? The Hon'ble Supreme Court of India in Suresh Nanda vs. CBI has answered this question in negative and observed that while the police may have the power to seize a passport under Section 102(1) Criminal Procedure Code, 1973, it does not have the power to impound the same. Impounding of a passport can only be done by the passport authority under Section 10(3) of the Passports Act, 1973 .
The bank has no authority to instruct the passport authority to invoke the provisions of section 10 of the passport act in this regard and there is no provision for that for the bank to deal with the same directly without a court order on it. The bank's apprehension in this regard cannot become law.