P1400 Code - Differential Pressure Feedback Electronic Sensor Circuit Low Voltage
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 Differential Pressure Feedback Electronic Sensor harness is open or shorted, Differential Pressure Feedback Electronic Sensor circuit poor electrical connection, Faulty Differential Pressure Feedback Electronic Sensor. 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
- P1400 indicates Differential Pressure Feedback Electronic Sensor Circuit Low Voltage.
- Common causes
- Common causes include Differential Pressure Feedback Electronic Sensor harness is open or shorted, Differential Pressure Feedback Electronic Sensor circuit poor electrical connection, Faulty Differential Pressure Feedback Electronic Sensor.
- 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 P1400 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 are 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 P1400?
- Differential Pressure Feedback Electronic Sensor harness is open or shorted
- Differential Pressure Feedback Electronic Sensor circuit poor electrical connection
- Faulty Differential Pressure Feedback Electronic Sensor
How to Fix the DTC P1400?
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 P1400 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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Information for Specific Makes
- P1400 Audi — EGR Valve Power Stage Circuit Electrical Malfunction
- P1400 BMW — Heated Catalyst Battery Voltage or Current too Low During Heating Bank 1
- P1400 Buick — Cold Start Emission Reduction Control System
- P1400 Cadillac — Cold Start Emission Reduction Control System
- P1400 Chevrolet — Cold Start Emission Reduction Control System
- P1400 Chrysler — Aftermarket Calibration Detected
- P1400 Dodge — Aftermarket Calibration Detected
- P1400 Ford — Differential Pressure Feedback Electronic Sensor Circuit Low Voltage
- P1400 GMC — Cold Start Emission Reduction Control System
- P1400 Hyundai — Manifold Differential Pressure Circuit Malfunction
- P1400 Infiniti — EGRC Solenoid Valve
- P1400 Isuzu — Cold Start Emission Reduction Control System
- P1400 Jeep — Aftermarket Calibration Detected
- P1400 Lexus — Sub-Throttle Position Sensor Circuit Fault
- P1400 Lincoln — Differential Pressure Feedback Electronic Sensor Circuit Low Voltage
- P1400 Mazda — DPFE Sensor Low Voltage
- P1400 Mercury — Differential Pressure Feedback Electronic Sensor Circuit Low Voltage
- P1400 MINI — Heated Catalyst Battery Voltage or Current too Low During Heating Bank 1
- P1400 Mitsubishi — Manifold Differential Pressure Sensor circuit
- P1400 Nissan — EGRC Solenoid Valve
- P1400 RAM — Aftermarket Calibration Detected
- P1400 Saturn — Cold Start Emission Reduction Control System
- P1400 Subaru — Fuel Tank Pressure Control Solenoid Low Input
- P1400 Toyota — Sub-Throttle Position Sensor Circuit Fault
- P1400 Volkswagen — EGR Valve Power Stage Circuit Electrical Malfunction
Frequently Asked Questions about P1400 Code
1. What are common symptoms of OBDII code P1400 (Differential Pressure Feedback Electronic Sensor Circuit Low Voltage)?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and potentially an illuminated check engine light.
2. What are the possible causes of OBDII code P1400?
- The code P1400 can be triggered by issues such as a faulty differential pressure feedback electronic (DPFE) sensor, damaged wiring or connectors in the sensor circuit, or a vacuum leak in the EGR system.
3. How can I diagnose the cause of OBDII code P1400?
- To diagnose the cause of P1400, you can visually inspect the DPFE sensor and its wiring, perform a voltage check on the sensor, check for any vacuum leaks in the EGR system, and use a scan tool to monitor sensor readings.
4. Can I continue driving with OBDII code P1400 present?
- While the vehicle may still be operable with code P1400, it is not recommended to drive for an extended period as it can lead to further engine damage and decreased performance.
5. Is it safe to ignore OBDII code P1400?
- Ignoring code P1400 can result in reduced fuel efficiency, engine misfires, and potential damage to emissions components. It is best to address the issue promptly to prevent further problems.
6. How can I repair OBDII code P1400?
- Repairing code P1400 typically involves replacing the faulty DPFE sensor, repairing or replacing damaged wiring or connectors, and addressing any vacuum leaks in the EGR system.
7. Can I reset OBDII code P1400 without repairing the issue?
- While you can clear the code temporarily, it will likely reappear if the underlying issue is not addressed. It is recommended to diagnose and repair the problem to prevent future occurrences.
8. Are there any DIY repair tips for fixing OBDII code P1400?
- DIY repair tips include checking for loose or damaged wiring connections, cleaning the DPFE sensor to remove any debris, and inspecting the EGR system for leaks or blockages.
9. How much does it typically cost to repair OBDII code P1400 at a mechanic?
- The cost of repairing code P1400 can vary depending on the labor rates and parts needed. On average, it can cost between $100 to $300 for parts and labor.
10. Can a faulty DPFE sensor cause other issues besides triggering OBDII code P1400?
- Yes, a faulty DPFE sensor can cause other issues such as poor engine performance, increased emissions, and potential damage to the catalytic converter if left unaddressed.
Discuss the causes and fixes for P1400 OBDII Code
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