P1403 Dodge Trouble Code: Symptoms, Causes, and Detailed Solutions
The check engine light illuminating on your dashboard is always a cause for concern. When the diagnostic scanner displays the P1403 Dodge code, it is crucial to understand what it means to act effectively. This trouble code, specific to Stellantis group vehicles (formerly Chrysler), is related to the Exhaust Gas Recirculation (EGR) system. Unlike a serious engine failure, P1403 often points to an electrical or sensor problem. This article guides you step by step to diagnose the causes, identify the symptoms, and apply the solutions to fix the P1403 problem on your Dodge.
What is the P1403 trouble code on a Dodge?
The P1403 code is a generic code related to the EGR system. More specifically, it indicates a “EGR Valve Control Circuit Low”. The EGR (Exhaust Gas Recirculation) valve’s role is to reduce nitrogen oxide (NOx) emissions by recirculating a small amount of exhaust gas back to the engine cylinders. The Engine Control Module (ECM) constantly monitors the voltage in the valve control circuit. When the ECM detects that the electrical signal is abnormally low or absent when it should be present, it records the P1403 Dodge code and illuminates the malfunction indicator lamp.
Common Symptoms of the P1403 Code
It is possible that the P1403 code does not cause any noticeable symptoms other than the illuminated check engine light. However, in most cases, you will notice some of these signs:
- Illuminated Check Engine Light: This is the most obvious and direct symptom.
- Irregular or Rough Idle: The engine may stall at idle or have hiccups.
- Decreased Performance and Loss of Power: A feeling of sluggishness, especially during acceleration.
- Increased Fuel Consumption: As the system is not working optimally, the engine may consume more fuel.
- Failed Emissions Test: Higher emissions will prevent you from passing the vehicle inspection.
Main Causes of the P1403 Fault
Several elements can be the origin of this code. Here are the most frequent causes, listed from the simplest to the most complex:
- Electrical Problems: This is the most common cause. It could be a loose, corroded, or damaged connector on the EGR valve or the Differential Pressure Feedback EGR (DPFE) sensor.
- Faulty Electrical Wires: A cut, chafed, or shorted wire in the harness connecting the EGR valve to the ECM.
- Faulty EGR Valve: The solenoid or transducer inside the valve itself has failed.
- Failing DPFE Sensor: This sensor measures the flow of recirculated gases and sends the information to the ECM. If it is defective, it can trigger the P1403 code.
- Problem with the PCM/ECM: Although rare, an internal failure of the engine control module could be the cause.
Diagnosis and Solutions to Fix P1403
Before replacing expensive parts, follow this logical diagnostic method.
1. Visual Inspection
Start with a thorough visual inspection. Locate the EGR valve (usually on the intake manifold) and its DPFE sensor. Carefully disconnect the electrical connectors and check that they are clean, free of corrosion, and securely fastened. Visually inspect the harness for any cut, burned, or damaged wires.
2. Electrical Tests
Using a multimeter, check the supply voltage and wire continuity. Test the resistance of the EGR valve solenoid by consulting the reference values in the repair manual for your specific Dodge model. Values outside the specified range will indicate a faulty valve.
3. Cleaning or Replacement
If the EGR valve is accessible, you can try to remove it and clean it with a specific product to remove carbon deposits that might be blocking it. If the electrical tests are bad, replacing the EGR valve or the DPFE sensor will be necessary. After any repair, clear the code with an OBD2 scanner to verify that it does not return after a drive cycle.
Conclusion
The P1403 Dodge code is generally not a sign of a catastrophic failure, but it should not be ignored. An unstable idle and increased pollutant emissions are its direct consequences. Starting with a simple inspection of the connectors and cables, you can often solve the problem at no cost. If the fault persists, replacing the EGR valve or its sensor will resolve this code and restore your vehicle’s optimal performance. For complex electrical work, do not hesitate to consult a professional mechanic.