P1405 2003 Ford F150 Code - DPF EGR Sensor Circuit High Voltage Detected
Quick Answer
The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. Common causes include Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor), Plugged or damaged EGR tube, Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P1405 2003 Ford F150 indicates DPF EGR Sensor Circuit High Voltage Detected .
- Common causes
- Common causes include Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor), Plugged or damaged EGR tube, Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P1405 2003 Ford F150 Description
The Ford DPFE/EGR system is controlled by the Powertrain Control Module (PCM). The system employs an EGR Valve, an Electronic Vacuum Regulator (EVR), and a Delta Pressure Feedback EGR sensor (DPFE).
The DPFE Sensor measures EGR flow across an orifice located inside the special EGR Tube. The orifice is positioned between two hose ports coming off the tube which is connected to the DPFE sensor with special heat-resistant hoses. When the EGR Valve is open, a pressure differential is created across the orifice (intake manifold pressure vs. exhaust pressure). By design, this difference in pressure is measured by the DPFE sensor in terms of voltage. The DPFE voltage signal output to the PCM is directly proportional to the flow of exhaust gas entering the intake manifold.
What are the Possible Causes of the DTC P1405 2003 Ford F150?
- Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor)
- Plugged or damaged EGR tube
- Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted
- Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1405 2003 Ford F150?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1405 2003 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1405 2003 Ford F150 Code
What does the OBDII code P1405 mean on a 2003 Ford F150?
P1405 indicates that the Differential Pressure Feedback EGR (DPFE) sensor circuit is detecting a high voltage, which typically relates to issues in the exhaust gas recirculation (EGR) system.
What are the common symptoms of code P1405 in a 2003 Ford F150?
Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, hesitation during acceleration, and the Check Engine Light being illuminated.
What causes the P1405 code to appear on a 2003 Ford F150?
Common causes include a faulty DPFE sensor, clogged or damaged EGR passages, a vacuum leak, damaged wiring or connectors in the DPFE sensor circuit, or a failing EGR valve.
Can I drive my 2003 Ford F150 with the P1405 code active?
While the vehicle may still be drivable, it’s not recommended, as the code indicates an issue with the EGR system that can lead to poor performance, increased emissions, and potential engine damage over time.
How can I diagnose the P1405 code on a 2003 Ford F150?
Start by checking the DPFE sensor and its wiring for damage or corrosion. Inspect the EGR valve and passages for clogs or leaks. Use a multimeter to test the sensor's voltage output to confirm if it’s out of range.
What tools are needed to troubleshoot the P1405 code?
You’ll need an OBDII scanner, a multimeter to test electrical circuits, and possibly basic hand tools to inspect and replace components like the DPFE sensor or EGR valve.
How do I fix the P1405 code on a 2003 Ford F150?
Common fixes include replacing the DPFE sensor, cleaning or replacing the EGR valve, clearing out clogged EGR passages, repairing damaged wiring, or addressing vacuum leaks in the system.
Is the DPFE sensor prone to failure in 2003 Ford F150 trucks?
Yes, the DPFE sensor is a known weak point in many Ford vehicles from this era and is a common cause of EGR-related trouble codes like P1405.
What does the DPFE sensor do in the EGR system?
The DPFE sensor measures the pressure difference in the EGR system to monitor exhaust gas flow and ensure proper functioning of the EGR valve.
How much does it typically cost to repair the P1405 code on a 2003 Ford F150?
Repair costs can vary, but replacing a DPFE sensor typically costs between $50 and $150 for parts, with additional labor costs if done by a professional.
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