Chrysler P1400 Trouble Code: Complete Diagnostic and Repair Guide
The check engine light illuminating on your Chrysler’s dashboard is always a cause for concern. When the scanner reveals the P1400 Chrysler trouble code, it indicates a specific problem with the emissions reduction system. This code signifies a malfunction in the Differential Pressure Feedback EGR (DPFE) sensor circuit or the measurement hose. Unlike other generic codes, P1400 is often a manufacturer-specific code for Chrysler, Dodge, and Jeep vehicles, requiring a targeted diagnostic approach. Understanding the root cause of this fault is essential for performing an effective repair and avoiding costly and unnecessary fixes. This article guides you through the symptoms, probable causes, and solutions to resolve the P1400 issue on your vehicle.
What is the P1400 Code on a Chrysler?
The P1400 trouble code is defined as “Exhaust Gas Recirculation (EGR) Differential Pressure Feedback (DPFE) Sensor Circuit.” This sensor plays a crucial role in the EGR (Exhaust Gas Recirculation) system. Its primary function is to measure the pressure difference between the two sides of the metal orifice located in the EGR tube. The Powertrain Control Module (PCM) uses this data to accurately determine the flow rate of recirculated gases and ensure the EGR valve is functioning correctly. When the PCM detects a voltage or signal outside the normal range from the DPFE sensor, it stores the P1400 Chrysler code and illuminates the malfunction indicator lamp.
Symptoms of the P1400 Fault
It’s possible for the P1400 code to be stored without any obvious symptoms appearing, especially in the early stages. However, most of the time, drivers will notice one or more of these signs:
- Illuminated Check Engine Light: This is the most obvious sign that the PCM has detected a fault.
- Increased Fuel Consumption: A faulty EGR system disrupts the air-fuel mixture.
- Rough Idle or Stalling: Poor gas recirculation can make the idle unstable.
- Loss of Power During Acceleration: The engine may feel sluggish or lack responsiveness.
- Failed Emissions Test: An EGR fault often leads to increased Nox (Nitrogen Oxides) emissions.
Probable Causes of the Chrysler P1400 Code
Several components can be the source of this code appearing. It is advisable to always start with the simplest and least expensive inspection.
- Clogged or Disconnected DPFE Sensor Hoses: The small rubber hoses connecting the sensor to the EGR tube can become clogged with soot, crack over time, or simply come loose.
- Faulty DPFE Sensor: The sensor itself is a common failure point. It can overheat and stop functioning correctly.
- Electrical Circuit Problem: This could be a bad connector, wires desoldered at the sensor, a cut wire, or pin corrosion.
- Clogged EGR Tube Orifice: The metal orifice in the EGR tube that allows pressure measurement can become clogged, skewing the readings.
- Problem with the PCM: Although rare, an internal failure of the control module could be the cause.
Diagnostic Procedure and Solutions
Before replacing expensive parts, follow these steps for an accurate diagnosis.
1. Visual Inspection: Turn off the engine and let it cool down. Locate the DPFE sensor (usually mounted on the intake manifold or near the EGR valve). Visually inspect the two small rubber hoses. Check that they are properly connected, without cracks, and that they are not collapsed or obstructed. Inspect the electrical connector for any signs of corrosion or damage.
2. Hose Cleaning: Carefully disconnect the hoses and use compressed air to blow out any carbon buildup. If they are damaged, replace them. This is often the solution to the P1400 Chrysler problem.
3. DPFE Sensor Test: Using a digital multimeter, you can check the sensor’s reference voltage (usually 5V) and ground. With the ignition on (engine off), also measure the signal return to the PCM; it should be around 0.5-1.5V. Values outside this range indicate a faulty sensor.
4. Replacement: If the hoses are in good condition and the electrical tests are abnormal, replacing the DPFE sensor is the most likely solution. Be sure to use a quality part to ensure the longevity of the repair.
After any repair, clear the code with a scanner and perform a drive cycle to ensure the P1400 fault does not return.