Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2023GLADIATOR MOJAVE, PART TIME T/CASE CONTROL, AUTOMATIC TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM3.6L (GPEC 2A) - DTCS P1129 TO P152F
2023 Jeep Gladiator Mojave, Part Time T/Case Control, Automatic Trans
3.6L (GPEC 2A) - DTCS P1129 To P152F
2023 Jeep Gladiator Mojave, Part Time T/Case Control, Automatic TransSECTION 3.6L (GPEC 2A) - DTCS P1129 To P152F
- DTC Troubleshooting
- P1129-Closed Loop Fueling Not Achieved - Bank 2 Upstream
- P1205-Fuel Pump Control Module Internal Performance
- Notes
- Known Issues - FPCM System
- FPCM System Operation
- Functional Description- Fuel Pump Control Module (FPCM) And Fuel Pump
- Functional Description - Powertrain Control Module (Pcm)
- Technical Data-Fuel System Pressure Specifications
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview-Fuel Pump Control Module
- Preliminary Diagnostic Checks
- Check For An Active Or Intermittent Condition
- Diagnostic Test - Communication And FPCM Internal Faults (P1205, P120A, U0109, U016C)
- Powertrain Verification Test
- P1206-Fuel Pump Control Module Open Circuit To Fuel Pump
- Notes
- Known Issues - FPCM System
- FPCM System Operation
- Functional Description- Fuel Pump Control Module (FPCM) And Fuel Pump
- Functional Description - Powertrain Control Module (Pcm)
- Technical Data-Fuel System Pressure Specifications
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview-Fuel Pump Control Module
- Preliminary Diagnostic Checks
- Check For An Active Or Intermittent Condition
- Diagnostic Test - Fuel Pump PWM Control Circuit Faults (P0628, P0629, P1205, P120B, P2633, P2634)
- Diagnostic Test - Complete Fuel Pump Control Module System Testing (Not DTC Specific)
- Powertrain Verification Test
- P1239-Engine Oil Temperature Too Low
- P1300-Crankshaft Position Learn Out Of Range
- P1400-Aftermarket Calibration Detected/Warranty Coverage Confirmation Required
- P1404-EGR Close Position Performance
- P141B-Starter Control 1 Circuit Performance
- P141C-Starter Control 2 Circuit Performance
- P141D-Starter Relay Feedback Open Circuit Performance
- P1456-Fuel Tank Pressure Sensor Circuit Low
- P1457-Fuel Tank Pressure Sensor Circuit High
- P1495-Left Front SEATBELT Switch Circuit High
- P1496-Left Front SEATBELT Switch Circuit Low
- P1524-Oil Pressure Out Of Range - Camshaft Advance/Retard Disabled
- P152C-Engine Hood Switch 2 Circuit Range/Performance
- P152D-Engine Hood Switch 2 Circuit Low
- P152E-Engine Hood Switch 2 Circuit High
- P152F-Engine Hood Switch 2 / Engine Hood Switch 1 Correlation
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.