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 61 (5.7L - DTCS P3401 TO U0404)
2023 Jeep Grand Cherokee Trailhawk 4xe
Section 61 (5.7L - DTCS P3401 To U0404)
2023 Jeep Grand Cherokee Trailhawk 4xeSECTION Section 61 (5.7L - DTCS P3401 To U0404)
WARNING: This page is about a different variant/trim than selected.
- DTC Troubleshooting
- P3401 Cylinder 1 Deactivation Control Circuit
- P3425 Cylinder 4 Deactivation Control Circuit
- P3441 Cylinder 6 Deactivation Control Circuit
- P3449 Cylinder 7 Deactivation Control Circuit
- P3497 Cylinder Deactivation System - Bank 2
- U0001-00 Can C Bus
- U0101-00 Lost Communication With TCM
- U0121 Lost Communication With Abs
- Notes
- Description And Operation - Braking Systems
- Component Functional Description - Brake Pedal Position Sensor
- Component Functional Description - Hydraulic Control Unit (HCU) Assembly
- Component Functional Description - Brake Pedal Simulator Pressure Sensor
- Component Functional Description - Wheel Speed Sensors
- Component Functional Description - Steering Angle Sensor
- Component Functional Description - Brake System Control Module (BSCM)
- Technical Data - Braking System Messages
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview
- Check For An Active Or Intermittent Condition
- DIAGNOSTIC TEST - eBOOSTER BRAKE SYSTEM - PCM
- Diagnostic Test - Wheel Speed Sensor Faults
- U0102 Lost Communication With Transfer Case Control Module / AWD
- U0103 Lost Communication With Electric Gear Shift Module
- U0109 Lost Communication With Fuel Pump Control Module
- 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
- 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
- U0129 Lost Communication With Brake System Control Module 1
- Notes
- Description And Operation - Braking Systems
- Component Functional Description - Brake Pedal Position Sensor
- Component Functional Description - Hydraulic Control Unit (HCU) Assembly
- Component Functional Description - Brake Pedal Simulator Pressure Sensor
- Component Functional Description - Wheel Speed Sensors
- Component Functional Description - Steering Angle Sensor
- Component Functional Description - Brake System Control Module (BSCM)
- Technical Data - Braking System Messages
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview
- Check For An Active Or Intermittent Condition
- DIAGNOSTIC TEST - eBOOSTER BRAKE SYSTEM - PCM
- Diagnostic Test - Wheel Speed Sensor Faults
- U0140 Lost Communication With Body Control Module
- U0151 Lost Communication With Occupant Restraint Controller
- U0155 Lost Communication With Cluster/CCN
- U0168 Lost Communication With Vehicle Security Control Module
- U0402 Implausible Data Received From TCM
- U0403 Implausible Data Received From T-Case
- U0404 Implausible Data Received From ESM
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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.