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 MANUALSDODGE AND RAM2023PROMASTER 3500 2D CAB CHASSISREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS3.6L - DTCS P2503 TO U0402
2023 Dodge and Ram ProMaster 3500 2D Cab Chassis
3.6L - DTCS P2503 To U0402
2023 Dodge and Ram ProMaster 3500 2D Cab ChassisSECTION 3.6L - DTCS P2503 To U0402
- DTC Troubleshooting
- P2503-Charging System Output Low
- P2504-Charging System Output High
- P257D-Engine Hood Switch Circuit Performance
- P258A-Electric Vacuum Pump Circuit
- P258B-Electronic Vacuum Pump Performance
- Notes
- Known Issues - Vacuum Pump System
- Description And Operation-Vacuum Booster Systems
- Component Functional Description - Vacuum Pump
- Vacuum Hose Assembly
- Enabling/Set Conditions And Possible Causes - Vacuum Pump
- Diagnostic Overview - Electric Vacuum Pump (EVP) System
- Check For An Active Or Intermittent Condition
- Diagnostics - Vacuum System Leak Test
- Diagnostics - Vacuum Pump Test
- P2610-Pcm Internal Engine Off Timer Performance
- P2B57-Low Engine Oil Pressure - Camshaft Control Disabled
- P3032-Barometric Pressure Sensor Performance Plausibility
- P3090-Upstream O2 Sensor Return Voltage Low
- P3091-Upstream O2 Sensor Return Voltage High
- P3092-Downstream O2 Sensor Return Voltage Low
- P3093-Downstream O2 Sensor Return Voltage High
- U0001-Can C Bus
- U0101-00-Lost Communication With TCM
- U0104-Lost Communication With Cruise Control Module
- 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 - 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 - Non-EBOOSTER Brake System - Pcm
- Diagnostic Test-Wheel Speed Sensor Faults
- U0125-Lost Communication With Dynamics Sensor
- 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 - 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 - Non-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
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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.