What this code means
DSRC stands for Dedicated Short-Range Communication. It is the module in your digital tachograph that lets roadside enforcement officers interrogate the unit remotely — without stopping your vehicle — as you pass a control point.
Code 84, internal DSRC fault, means the tachograph has detected an internal fault on this module, or that the DSRC antenna is faulty or not connected. According to the manual, the severity of this fault is Low.
What to do now
The manual gives one instruction for code 84:
- Acknowledge the message on the tachograph display.
- Have the DSRC module, cabling and antenna checked at an approved workshop.
There is no requirement to stop driving. Book the workshop visit at your next opportunity.
Your tachograph logs this fault — TAGRA reads it
TAGRA doesn't repair a DSRC fault — only an approved workshop can replace a faulty module or antenna. But once code 84 is written to the tachograph's memory and to your driver card, TAGRA finds it in your downloaded data, evaluates it and documents it — exactly what you need at a roadside check, and when you raise a warranty claim with the workshop.
Stop looking up codes by hand — try TAGRA TRUCKER free for 30 daysWhy it happens
According to the manual, code 84 has two possible causes:
- an internal fault within the DSRC module itself, or
- a fault on the DSRC antenna, or the antenna is not connected.
Because the DSRC module only handles remote roadside interrogation, a fault here does not interrupt the normal recording of driving, other work, availability or rest.
Can you keep driving?
Yes. Code 84 is classified as Low severity in the manual. It does not affect the tachograph's core recording function, and there is no requirement to stop the vehicle.
The only practical effect is that remote DSRC interrogation at a roadside control point may not work correctly until the module is repaired — in that case an inspector simply carries out a normal in-cab check instead. Acknowledge the message and have the DSRC module, cabling and antenna checked at your next approved workshop visit.
Also displayed as
Drivers across Europe see the same fault under different on-screen wording. These are the real search terms used for code 84:
- Defect intern DSRC 84 — Romanian
- DSRC storing 84 — Dutch
- DSRC Störung 84 — German
- Guasto interno DSRC 84 — Italian
- Falha DSRC interna 84 — Portuguese
- Błąd tacho DSRC 84 — Polish
Related codes
Frequently asked questions
What does DSRC mean on a tachograph?
DSRC stands for Dedicated Short-Range Communication. It is the module that lets roadside enforcement officers interrogate your tachograph remotely, without stopping your vehicle, as you pass a control point.
Can I keep driving with an internal DSRC fault (code 84)?
Yes. The manual classifies code 84 as Low severity. It does not affect the recording of driving time, breaks or rest — acknowledge the message and book a workshop check.
Does code 84 affect my driver card data?
No. The DSRC module only handles remote roadside interrogation — it plays no part in recording your driving, other work, availability or rest, which is why the manual rates this fault Low severity.
What should I do if code 84 keeps coming back?
Have the DSRC module, cabling and antenna checked at an approved workshop, as instructed by the manual. A recurring fault points to a wiring or antenna connection problem rather than a one-off glitch.