Short Text Horn Action Long Text Quick Fault Resolution UFC PCM Fault Name
Critical ‑ Voltage Critical
Return to port immediately ‑
Service engine before next
use.
Sensor power supply voltage is high.
Inspect wire harness,
inspect sensors
601 4 XDRPa_RangeHigh
602 4 XDRPb_RangeHigh
Sensor power supply voltage is low.
Inspect wire harness,
inspect sensors
601 5 XDRPa_RangeLow
602 5 XDRPb_RangeLow
Emergency Stop Caution
Check lanyard ‑ Key engine off
and restart. If condition persists
‑ service engine soon.
Emergency stop has been activated. Check lanyard circuit 1109 23 ESTOP_Active
Engine Overspeed None
If condition persists trim angle
may be too high. Stop engine
and check propeller for
damage or improper size.
Engine Guardian is active due to
excessive engine speed. Power will
be limited to prevent engine damage.
Check propeller 2091 23 Guardian_Overspeed
Reduce engine speed.
Engine speed is above specified
limits with engine in neutral.
Put engine in gear 2092 23 Neutral_Overspeed
Engine Power Limited Caution Reduce engine speed.
Engine Guardian is active due to
battery voltage. Power will be limited
to prevent engine damage.
Check battery
connections and fusible
link
2111 23 Guardian_Voltage
Engine Guardian is active due to
excessively high or low oil temp.
Power will be limited to prevent
engine damage.
Check engine oil level
2021 6 Guardian_OilTemp
2021 23 Guardian_Oil_Temp_Derate
Engine Guardian is active due to
exhaust overtemp. Power will be
limited to prevent engine damage.
Check exhaust sprayers 2032 23 Guardian_EGTTemp
Engine Power Limited Caution
Reduce engine speed. If
condition persists stop engine
and check for plugged water
inlet.
Engine Guardian is active due to
engine overtemp. Power will be
limited to prevent engine damage.
Check exhaust sprayers 2081 23 Guardian_Overheat
Engine Guardian is active due to low
engine water pressure. Power will be
limited to prevent engine damage.
Check water pickups,
check sensor hose for
debris
2061 23 Guardian_WaterPressure
Engine Power Limited Caution
Reduce engine speed. If
condition persists stop engine
and check oil level.
Engine Guardian is active due to low
oil pressure. Power will be limited to
prevent engine damage.
Check oil level 2051 23 Guardian_OilPressure
Engine Power Limited None Reduce engine speed.
Engine Guardian is active due to a
helm fault. Power will be limited to
prevent engine damage.
Check wire connectors
and terminator resistors
2101 23 Guardian_uXPowerLimit
Engine Guardian is active. Power will
be limited to prevent engine damage.
Key engine off and back
on
2011 23 Guardian_Active
Engine Sensor Caution
Check oil level on dipstick.
Service engine soon.
Engine oil level sensor is not working
properly.
Check oil level, check
wire connections
711 24 OilLevel_RangeHigh
711 6 OilLevel_Sensor_Faulted
Engine oil may be contaminated. 711 12 OilLevel_Sensor_Invalid
General Troubleshooting
Page 3A-6 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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