P1244 Isuzu Alternator Load Input Failed High

P1244 Isuzu Alternator Load Input Failed High

Possible causes
  • GEN-MON circuit short to B+.
  • GEN-COM circuit short to B+.
  • B+ open prior to start-up.
  • Open GEN-COM prior to start-up.
  • Open I-line prior to start-up.
  • Damaged PCM.

    • Tech description
  • 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)
    P1244 Isuzu Description

    The PCM monitors generator load from the generator/regulator in the form of frequency. The fault indicates the input is lower than the load should be in normal operation. The load input could be high when a battery short to ground exists.

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