Polaris 600 Switchback Owner's Manual page 30

FEATURES
Detonation Elimination Technology (DET)
The DET system prevents damage to the engine from detonation by
going into an engine protection mode whenever the DET system is
active.
When excessive detonation is detected,
the check engine light will illuminate
and you may notice decreased engine
performance and RPM when the DET
system is activated. In most cases this
is temporary and the operator does not
need to take any action. The engine
will return to its normal performance
automatically.
If severe detonation occurs, the check engine light will begin to flash
steadily and the gauge indicator will read "dET" (see illustration). The
engine will enter a limp home mode and RPM will be limited to 6500
RPM. The engine will remain in this mode until it is shut down and
restarted.
Check Engine Light
Solid or Flickering
Steady Flashing
28
Excessive detonation detected
Severe detonation detected, RPM will be limited
Indicates