OBDII Code List

P1AA8 CADILLAC - Starter/Generator Field Control Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Motor Generator Unit (MGU)
  • Motor Generator Unit (MGU) harness is open or shorted
  • Motor Generator Unit (MGU) circuit poor electrical connection

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1aa8 Cadillac Description

The Starter/Generator Control Module (SGCM) monitors the Motor Generator Unit (MGU) field coil circuit to see if the field coil current is within tolerance.
OBDII Code P1aa8 Cadillac - Starter/Generator Field Control Performance -

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