The customer should ensure the following:

• The customer has an active tag - Check under the "Manage Tags" section in your FASTag sub-wallet
• The customer has sufficient amount (atleast Rs. 150 for Car/Jeep/Van) in his/her Paytm FASTag wallet

If problem persists, call us on FASTag Toll-free number: 1800-120-4210


Also Refer below YouTube video tutorial on Paytm FASTag Not Working.