AutoCodes – Ford – P1400 1997 Ford F150

P1400 1997 Ford F150 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 1997 Ford F150 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.

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Code Popularity 6,670

How popular is this code, among other codes? Low

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 18, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1400 1997 Ford F150 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 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.

OBDII Code P1400 1997 Ford F150 - Differential Pressure Feedback Electronic Sensor Circuit Low Voltage - AutoCodes.com — P1400 1997 Ford F150 Code - Differential Pressure Feedback Electronic Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1400 1997 Ford F150?

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
Damaged PCM

How to Fix the DTC P1400 1997 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.

What does this mean?

Code Tech Notes

The EGR monitor checks the DPF EGR sensor signal to the PCM for low voltage. The test fails when the average voltage to the PCM drops to a voltage less than the minimum calibrated value.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1400 1997 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.

Need more information about the P1400 1997 Ford F150 code?

Need more information on how to fix the P1400 1997 Ford F150 code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P1400 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P1400 on a 1997 Ford F150?

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

2. What does the OBDII code P1400 indicate in a 1997 Ford F150?

- The code P1400 specifically points to an issue with the Differential Pressure Feedback Electronic (DPFE) sensor circuit registering low voltage.

3. What are the possible causes of the DPFE sensor circuit low voltage issue in a 1997 Ford F150?

- Potential causes include a faulty DPFE sensor, damaged wiring or connectors in the sensor circuit, a clogged EGR system, or a malfunctioning PCM (Powertrain Control Module).

4. How can I diagnose the DPFE sensor circuit low voltage problem on my 1997 Ford F150?

- Diagnosis usually involves inspecting the DPFE sensor and its connections, checking for any damaged wiring, testing the EGR system for blockages, and scanning the PCM for error codes.

5. Can I drive my 1997 Ford F150 with OBDII code P1400?

- It is generally not recommended to drive with the P1400 code illuminated, as it can lead to decreased engine performance, potential damage to components, and poor fuel efficiency.

6. How can I repair the DPFE sensor circuit low voltage issue on my 1997 Ford F150?

- Repairs may involve replacing the DPFE sensor, repairing damaged wiring or connectors, cleaning or replacing the EGR system components, or reprogramming the PCM if necessary.

7. Is it safe to reset the Check Engine Light after addressing the P1400 code on a 1997 Ford F150?

- Yes, once the issue causing the P1400 code has been resolved, it is safe to reset the Check Engine Light using an OBDII scanner to clear the error code.

8. Are there any preventive maintenance tips to avoid the DPFE sensor circuit low voltage problem in a 1997 Ford F150?

- Regularly inspecting and cleaning the EGR system, checking the DPFE sensor and its connections for any signs of wear, and following the recommended service intervals can help prevent this issue.

9. Does the OBDII code P1400 on a 1997 Ford F150 affect emissions compliance?

- Yes, the P1400 code is related to the EGR system, which plays a crucial role in controlling emissions. Therefore, it is important to address this issue to maintain emissions compliance.

10. Can a DIY enthusiast with basic automotive knowledge fix the DPFE sensor circuit low voltage problem in a 1997 Ford F150?

- Depending on the root cause, a DIY enthusiast with basic automotive knowledge may be able to address the issue by following repair guides, but complex repairs or diagnostics may require professional assistance.