PUC for BS-VI trucks: validity, testing and the insurance link

The Pollution Under Control certificate is the cheapest document a truck carries and the quickest to renew. It is also the one most often found expired at a checkpoint, because it is renewed often and nobody thinks of it as important. On a BS-VI truck, the rules around it are worth a second look.

How long a PUC lasts

PUC validity is set by rule 115 of the Central Motor Vehicles Rules and depends on the vehicle and its emission norm. The common position is one year for BS-IV and BS-VI vehicles and six months for older ones. The validity printed on the certificate is what counts, so always read the date off the certificate or the vehicle record rather than assuming.

Under the same rule, a new vehicle is covered for its first year from registration. The first test is due a year after the truck is registered, which is exactly the kind of date that nobody writes down on the day a new truck arrives.

Trucks registered new from April 2020 are BS-VI. A mixed fleet will have trucks on both cycles, which is one more reason a single "PUC every year" line in the register does not work.

What the test involves

For a diesel truck, the PUC test measures smoke opacity: the engine is revved under a set procedure and a meter reads how much light the exhaust blocks. BS-VI diesel trucks have exhaust after-treatment, including a diesel particulate filter and in most cases SCR with diesel exhaust fluid, so a healthy BS-VI truck passes easily. One that fails is telling you something about the engine or the after-treatment that will cost more if ignored.

PUC certificates are now generated through the national PUC system and linked to the vehicle's registration number, so an enforcement officer or a camera-linked system can check the validity without seeing the paper.

The penalty

Driving without a valid PUC certificate is an offence under Section 190(2) of the Motor Vehicles Act: up to ₹10,000. States can set different compounding amounts. For a test that costs a small fraction of that and takes a few minutes, this is the most lopsided penalty a fleet faces. Use the PUC due date calculator to check any truck.

The insurance link

Following a Supreme Court direction in 2017, insurers were told not to renew a vehicle's insurance policy without a valid PUC certificate. In practice, this means an expired PUC can hold up the insurance renewal. If the PUC lapses a few days before the policy is due, and nobody notices until the insurer asks, the policy can lapse too, and an uninsured truck is a far bigger problem than a PUC challan.

The fix is simple: line up the PUC test before every insurance renewal. If the policy is due in the next 30 days and the PUC expires within that window or soon after, renew the PUC first.

Electronic copies

A PUC held in DigiLocker or mParivahan is accepted as valid under MoRTH's advisory on electronic documents. Drivers do not need to carry a paper copy if the electronic one is available on the phone, but the certificate still has to be valid. A digital copy of an expired PUC is still an expired PUC.

A simple routine for a fleet

• Record the emission norm for every truck, read from the vehicle record, so the 12-month or 6-month cycle is right.
• Remind the driver, not only the office: the test usually happens wherever the truck is, at any authorised centre.
• Ask the driver to send a photo of the new certificate, and check the new validity on the record.
• Before every insurance renewal, check the PUC validity first.

The PUC certificate guide covers renewal steps and common mistakes in more detail.

Where PRACHSO fits

PRACHSO reads PUC validity for each truck from the vehicle record and sends the reminder to the driver on WhatsApp in his language, because he is the one who can get the test done on the road. When an insurance renewal is coming up, the PUC date is shown beside it so the office can see the dependency. The new certificate is attached to the renewal task and added to the Roadside Pack.