2011 Polaris Ranger RZR ATV Service Manual, Page 360Get this manual
ELECTRICAL UnderOver Voltage This warning usually indicates that the vehicle is operating at an RPM too low to keep the battery chargedIt may also occur when the engine is at idle and high electrical load is applied (lights, cooling fan or other accessories)If battery voltage drops below 11 volts, warning screen will display "Lo" and provide the present battery voltageIf voltage drops below 8.5 volts, LCD backlighting and icons will turn off
Diagnostic Mode
The diagnostic mode is accessible only when the check engine MIL has been activatedUse the following procedure to display diagnostic trouble codes that were activated during current ignition cycle causing the MIL to illuminateDiagnostic trouble codes will remain stored in the gauge (even if MIL turns off) until the key is turned off1If the trouble code(s) are not displayed, use the MODE button to toggle until "CK ENG" displays on the information display area