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Reasons Why FASTags Get Blacklisted and How to Prevent It
Real causes behind FASTag blacklisting and simple steps to avoid toll issues.
FASTag has made toll payments faster, but many users still face a common issue: their FASTag gets blacklisted without warning. When this happens, toll plazas do not allow the vehicle to pass through the FASTag lane, and manual payment becomes the only option. This not only causes delays but also results in additional charges.
Understanding why a FASTag gets blacklisted is important because most of these issues can be avoided with simple steps. Here are the real reasons and how they affect toll payments.
Low Balance or Zero Balance
This is the most common reason. FASTag must always maintain a minimum balance. If the balance drops below the required limit, the tag becomes inactive.
Many users assume the toll will still deduct the amount and recharge later, but FASTag systems block the tag instantly when the balance is too low. This is why keeping a small buffer amount helps avoid sudden blocks.
Tag Not Linked Properly With Bank or Wallet
FASTags must be correctly linked with your bank account or payment wallet. If there is any mismatch in KYC details, vehicle number, or account status, the tag can be disabled by the issuing bank.
This usually happens when:
The KYC is incomplete
The account used with FASTag becomes inactive
There is a delay in verifying vehicle registration
Banks automatically block these tags to avoid errors at toll plazas.
One Vehicle, Multiple FASTags Issue
NHAI follows the “One Vehicle, One FASTag” rule. If more than one FASTag is linked to a single vehicle number—maybe from past usage or after changing banks—NHAI’s system flags it.
If the older tag is not closed, the new tag may get blacklisted. Many drivers encounter this issue after switching from a Paytm FASTag to a FASTag issued by another bank.
Damaged or Faulty FASTag Sticker
If your FASTag sticker is torn, scratched, sun-damaged, or placed incorrectly, toll scanners cannot read it. When a scanner fails to detect the tag repeatedly, the system marks it as unreadable and blocks it temporarily.
Some users also paste the tag on tinted glass or behind decorative sun films, which reduces visibility.
Bank-Wide Technical Issues
Sometimes the FASTag issuing bank faces a system problem. During these periods, tags linked with that bank may get temporarily blocked or show errors at toll booths.
This problem is not related to the user and usually gets fixed when the bank restores its services.
Incorrect Vehicle Class in the FASTag
FASTags have specific categories based on the type of vehicle—car, SUV, commercial vehicle, truck, and so on. If the wrong class is entered by mistake, toll plazas detect the mismatch and blacklist the tag.
For example:
A FASTag used on a commercial vehicle will be blocked until corrected.
Also read→
How to Close or Deactivate Airtel Bank FASTag Easily
Blacklisting Due to Negative Wallet Balance
Some banks offer auto-recharge or credit-based FASTag wallets. If the wallet goes into negative balance, for example, after a failed recharge, the system immediately blocks the tag. This prevents toll misuse.
Misuse, Fraud, or Suspicious Activity
FASTag systems check for repeated errors or unusual behaviour, such as:
Using one FASTag on two vehicles
Attempting to bypass tolls
Forcefully crossing FASTag lanes without payment
If detected, NHAI or the issuing bank may block the tag for security reasons.
FASTag Not Updated After Ownership Transfer
When a used car changes ownership, the FASTag linked to the previous owner remains active. If the new owner drives with the old FASTag, the tag often gets blacklisted because the registered details no longer match.
How to Avoid FASTag Blacklisting
To keep your FASTag active:
Maintain a balance above the minimum requirement
Complete full KYC with accurate vehicle details
Remove old FASTags before using a new one
Place the tag correctly on the windscreen
Check for bank messages or alerts regularly
After selling your vehicle, close the old FASTag immediately
These simple steps prevent most issues.
What to Do If Your FASTag Gets Blacklisted
If your tag is already blacklisted:
Check the balance and recharge immediately
Contact the issuing bank’s customer support
Ask for KYC or account verification if required
Replace damaged tags with a new one
Close duplicate or old FASTags
Raise a ticket through the bank or NHAI portal
Most blacklisted tags are restored within a few hours once the issue is fixed.
Also read→
How to Close or Deactivate South Indian Bank FASTag
Final Word
FASTag blacklisting happens mainly due to low balance, incorrect details, duplicate tags, or technical issues. Understanding these causes helps you avoid delays at toll plazas and keeps your travel smooth. Keeping your FASTag updated and maintaining a small balance buffer is the easiest way to prevent blacklisting.
