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 MANUALSJEEP2023GRAND CHEROKEE TRAILHAWK 4XEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 57 (5.7L - DTCS P1128 TO P1573)DTC TROUBLESHOOTINGP1206 FUEL PUMP CONTROL MODULE OPEN CIRCUIT TO FUEL PUMPTECHNICAL DATA FUEL SYSTEM PRESSURE SPECIFICATIONS
2023 Jeep Grand Cherokee Trailhawk 4xe
Technical Data Fuel System Pressure Specifications
2023 Jeep Grand Cherokee Trailhawk 4xeSECTION Technical Data Fuel System Pressure Specifications
WARNING: This page is about a different variant/trim than selected.
The table below shows the fuel system pressure specifications.
| VARIABLE FUEL PRESSURE SYSTEM SPECIFICATIONS (6.2L ENGINES) | ||
| CRANKING | 520 kPa (75.4 psi) | System operates in open loop during cranking. |
| IDLE | 340 - 400 kPa (49 - 58 psi) | Normal operating range at idle - Pressure is dependant on ambient and fuel temp. Pressure is raised during high temp to prevent boiling. |
| NORMAL RANGE OF OPERATION | 340 - 550 kPa (49 - 80 psi) | Normal operating range between idle and high engine demand. |
| 100% DUTY CYCLE | 600 - 700 kPa (87 - 101.5 psi) | This is regulated by the pressure relief valve in the Fuel Pump. The pressure can vary from pump to pump. |
| 4 CYLINDER (1.0L/1.3L GSET / 2.0L GMET ENGINES) | ||
| CRANKING | 580 kPa (84.1 psi) | System operates in open loop during cranking. |
| ALL OTHER OPERATING CONDITIONS | 520 kPa (75.4 psi) | The fixed pressure systems should maintain approximately 75.0 psi during normal operation. |
| 6 CYLINDER (3.0L GMET ENGINES) | ||
| CRANKING | 650 - 660 kPa (94.2 - 95.7psi) | System operates in open loop during cranking |
| ALL OTHER OPERATING CONDITIONS | 600 kPa (87 psi) | The fixed pressure systems should maintain approximately 87 psi during normal operation. Periodically, with the engine @ idle, the pressure is bumped up to 650 - 660 kPa (94.2 - 95.7psi) to check for a stuck fuel rail pressure sensor signal. |
| FIXED PRESSURE SYSTEM SPECIFICATIONS (ALL OTHER ENGINES) | ||
| The fixed pressure systems should maintain approximately 400 kPa (58.0) psi during normal operation | ||
GENERIC SYSTEM SCHEMATIC:
RENDER: 1.0x
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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.