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 MANUALSJEEP2023COMPASS ALTITUDEREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.0L - DTCS U0109 TO U0427
2023 Jeep Compass Altitude
2.0L - DTCS U0109 To U0427
2023 Jeep Compass AltitudeSECTION 2.0L - DTCS U0109 To U0427
- DTC Troubleshooting
- 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
- U0121-Lost Communication With Abs
- Notes
- Theory Of Operation-Braking Systems
- Component Functional Description - Brake Pedal Position Sensor
- Component Functional Description - Hydraulic Control Unit (HCU) Assembly
- Component Functional Description - Wheel Speed Sensors
- Component Functional Description - Steering Angle Sensor
- Component Functional Description - Anti-Lock Brake System Control Module (Abs)
- Technical Data-Braking System Messages
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview
- Check For An Active Or Intermittent Condition
- Diagnostic Test - Non-EBOOSTER Brake System - Pcm
- Diagnostic Test-Wheel Speed Sensor Faults
- U0128-Lost Communication With Park Brake Control Module
- U0129-Lost Communication With Brake System Control Module 1
- Notes
- Theory Of Operation-Braking Systems
- Component Functional Description - Brake Pedal Position Sensor
- Component Functional Description - Hydraulic Control Unit (HCU) Assembly
- Component Functional Description - Wheel Speed Sensors
- Component Functional Description - Steering Angle Sensor
- Component Functional Description - Anti-Lock Brake System Control Module (Abs)
- Technical Data-Braking System Messages
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview
- Check For An Active Or Intermittent Condition
- Diagnostic Test - Non-EBOOSTER Brake System - Pcm
- Diagnostic Test-Wheel Speed Sensor Faults
- U012D-Lost Communication With Alternator Control Module
- 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
- U017E-Lost Communication With SEATBELT Sensor 1
- U02A9-Lost Communication With Charge Air Cooler Coolant Pump
- U0402-Implausible Data Received From TCM
- U0403-Implausible Data Received From T-Case
- U0404-Implausible Data Received From ESM
- U0405-Invalid Data Received From Cruise Control Module
- U0416-Implausible Data Received From Esp
- U0417-Implausible Data Received From Park Brake Control Module
- U0418-Implausible Data Received From Brake System Control Module 1
- Notes
- Theory Of Operation-Braking Systems
- Component Functional Description - Brake Pedal Position Sensor
- Component Functional Description - Hydraulic Control Unit (HCU) Assembly
- Component Functional Description - Wheel Speed Sensors
- Component Functional Description - Steering Angle Sensor
- Component Functional Description - Anti-Lock Brake System Control Module (Abs)
- Technical Data-Braking System Messages
- When Monitored
- Set Condition
- Default Action
- Possible Causes
- Diagnostic Overview
- Check For An Active Or Intermittent Condition
- Diagnostic Test - Non-EBOOSTER Brake System - Pcm
- Diagnostic Test-Wheel Speed Sensor Faults
- U0422-Invalid Data Received From Body Control Module
- U0424-Implausible Data Received From HVAC Control Module
- U0426-Implausible Data Received From Vehicle Security Control Module
- U0427-Invalid Data Received From Vehicle Security Control Module
- U0109-Lost Communication With Fuel Pump Control Module
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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.