ADAS fault: what could be going on?

In everyday language, 'ADAS fault' is used for several different situations where a driver assistance system doesn't work as the driver expects. These don't always mean the same thing.

A dashboard message that a system is unavailable, a feature that can't be switched on temporarily, or a driver assistance system that repeatedly drops out unexpectedly — all of these are experienced as a 'fault'. Even so, it's useful to distinguish between them.

Under certain conditions, a system may temporarily lack enough information to work reliably. The car then switches the feature off as a precaution and displays a message.

There may also be an issue with hardware, software, sensors, alignment, communication between vehicle systems, or another technical cause. This can only be established by examining the vehicle.

A system can also stay active but respond differently from what the driver expects. This isn't automatically the same as a technical fault, but it can still be worth reporting.

Driver assistance systems depend on certain conditions for sensors and software to process information reliably. If those conditions aren't met, a system may switch itself off or perform less well.

These are possible factors. An error message or unexpected dropout alone cannot tell you what caused it.

Some causes of a temporary message are easy to check. Pay attention to safety: only touch sensors and cameras according to the manufacturer's instructions.

If a warning disappears once conditions change, that doesn't necessarily mean the cause is known. The system may become available again because the sensor once more has enough information, not because any underlying technical issue has been resolved.

If the message keeps returning, or the system doesn't work as expected, have the vehicle assessed by a qualified garage or service centre.

Sometimes checking it yourself isn't enough. Have the vehicle assessed by a qualified garage or service centre if one or more of the following apply.

Depending on the vehicle and system, a garage can, for example, read fault codes, check sensors, assess whether calibration is needed, and check whether software updates or manufacturer procedures apply.

Sometimes it's difficult to tell whether you're dealing with a fault or with unexpected ADAS behaviour. Both experiences can be relevant for ADAS Meldpunt, but they aren't the same.

Example of a fault or unavailability: 'Lane Assist temporarily unavailable.'

Example of unexpected behaviour: the feature stays active, but the car gives a steering or braking response the driver didn't expect.

Is it about a specific system? Also check our pages on problems with Lane Assist, unexpected braking or unexpected steering behaviour.

The more specific the report, the more useful it is for analysis.

Have you experienced a fault or an unexpected dropout? Report an ADAS fault to ADAS Meldpunt. A report to ADAS Meldpunt doesn't replace a technical diagnosis or repair.