P1246 Alternator Load Input Failed

Possible causes
  • GEN-MON circuit short to GND.
  • GEN-MON circuit short to B+.
  • GEN-MON circuit open.
  • GEN-COM circuit short to GND.
  • GEN-COM circuit short to B+.
  • GEN-COM circuit open.
  • ILC circuit short to GND.
  • ILC circuit short to B+.
  • ILC circuit open.
  • Battery-sense circuit open.
  • Generator drive mechanism.
  • Damaged generator/regulator assembly.
  • Damaged PCM.
    • Tech notes
  • Verify the battery voltage is 14.5 volts.
  • Verify the generator/regulator has the correct part number.
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1246 Description
    The PCM monitors generator load from the generator/regulator in the form of frequency. The frequency range is determined by the temperature of the voltage regulator, where 97% indicates full load, and below 6% indicates no load.
    P1246 Information for specific makes
    P1246 ACURA
    P1246 FORD