AutoCodes – Generic – P1405

P1405 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 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.

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Code Popularity 67,268

How popular is this code, among other codes? Medium

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1405 Description

The purpose of the Exhaust Gas Recirculation (EGR) system on your engine is to limit oxides of nitrogen (NOx) emissions. This is done by redirecting small amounts of exhaust gas back through the upper intake to get mixed in with the air/fuel charge. The resultant diluted air/fuel mixture (i.e., less oxygen per cubic foot) burns cooler and combustion chamber temperatures are reduced accordingly, thereby lowering NOx emissions.
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.

OBDII Code P1405 - DPF EGR Sensor Circuit High Voltage Detected - AutoCodes.com — P1405 Code - DPF EGR Sensor Circuit High Voltage Detected

What does this mean?

What are the Possible Causes of the DTC P1405?

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?

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1405 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.

Need more information about the P1405 code?

Need more information on how to fix the P1405 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1405 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1405 BMW — Heated Catalyst Power Switch Overtemperature Condition Bank 2
P1405 Buick — Exhaust Gas Recirculation System Valve 3
P1405 Cadillac — Exhaust Gas Recirculation System Valve 3
P1405 Chevrolet — Exhaust Gas Recirculation System Valve 3
P1405 Chrysler — EGR Solenoid High
P1405 Dodge — EGR Solenoid High
P1405 Ford — DPF EGR Sensor Circuit High Voltage Detected
P1405 GMC — Exhaust Gas Recirculation System Valve 3
P1405 Hyundai — Catalyzed Particulate Filter Permanent Regeneration
P1405 Jeep — EGR Solenoid High
P1405 Lincoln — DPF EGR Sensor Circuit High Voltage Detected
P1405 Mazda — DPFE Upstream Hose Off Or Plugged
P1405 Mercury — DPF EGR Sensor Circuit High Voltage Detected
P1405 RAM — EGR Solenoid High
P1405 Toyota — Turbo Pressure Sensor Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1405 Code

1. What are the common symptoms of OBDII code P1405 (DPF EGR Sensor Circuit High Voltage Detected)?

- Common symptoms include decreased engine performance, rough idling, increased fuel consumption, and the illumination of the Check Engine Light.

2. What are the potential causes of DPF EGR Sensor Circuit High Voltage Detected (P1405) code?

- The code may be triggered by a faulty DPF EGR sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

3. How can I diagnose the cause of OBDII code P1405?

- A thorough inspection of the DPF EGR sensor and its circuit, along with testing for continuity in the wiring, is necessary. A scan tool can help identify the specific issue.

4. Can a dirty EGR valve cause code P1405 to appear?

- While a dirty EGR valve itself may not directly trigger code P1405, it can contribute to overall EGR system issues that may lead to the detection of high voltage in the sensor circuit.

5. What are some DIY repair tips for resolving code P1405?

- DIYers can start by checking the sensor wiring for any visible damage or corrosion, ensuring proper connections, and cleaning the sensor to see if the code clears before seeking professional help.

6. Is it safe to continue driving with the P1405 code present?

- It is generally not recommended to drive with the P1405 code as it can lead to decreased engine performance and potential long-term damage if left unresolved.

7. How much does it typically cost to repair OBDII code P1405 at a mechanic or dealership?

- Repair costs for code P1405 can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor at a mechanic or dealership.

8. Can resetting the Check Engine Light make the P1405 code disappear permanently?

- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue causing P1405 is not resolved, the code is likely to reappear after driving a certain distance.

9. Will code P1405 affect my vehicle's emissions output?

- Yes, since code P1405 is related to the DPF EGR sensor circuit, it can impact the proper functioning of the exhaust gas recirculation system, potentially leading to increased emissions output.

10. How often should I check the DPF EGR sensor and related components to prevent code P1405 from appearing?

- Regular inspection and maintenance of the DPF EGR sensor, wiring, and connections as part of routine vehicle servicing can help prevent issues that trigger code P1405.