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2024
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Gladiator Nighthawk, Part Time T/Case Control, Automatic Trans
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Repair and Diagnosis (Single Page)
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Engine Performance
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System
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3.6L (GPEC 5) - DTCS P1071 To P1239
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DTC Troubleshooting
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P1128 Closed Loop Fueling Not Achieved - Bank 1 Upstream
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Set Condition
Set Condition
Once the enable time has been reached and all enable conditions are met, the diagnostic will check for closed loop fuel control. If closed loop control is not active by the time the enable timer has expired, the diagnostic will fail.