FixVault
Home
›
Jeep
›
2021
›
Compass Altitude, FWD
›
Repair and Diagnosis
›
Engine Performance
›
System
›
2.4L - DTCS P1048 To P1D68
›
DTC Troubleshooting
›
P1128-Closed Loop Fueling Not Achieved - Bank 1 Upstream
›
Set Condition
Set Condition
The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than otherwise would have been expected to achieve closed loop operation.