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P0400 1997 Ford F150 Code - Exhaust Gas Recirculation Flow

- Code Popularity: 3,087 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P0400 1997 Ford F150?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Exhaust Gas Recirculation (EGR) volume control valve stuck closed
  • Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve
  • Faulty EGR Valve
  • Faulty EGR temperature sensor and circuit
  • Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted
  • Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection
  • Dead (Weak) battery
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How to Fix the DTC P0400 1997 Ford F150?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

The EEGR system is monitored once per drive cycle during steady state conditions above 48 mph . The test will fail when a malfunction is detected by PCM calculations indicating the EGR flow is less or greater than expected.

EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0400 1997 Ford F150 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

Exhaust Gas Recirculation (EGR) flow control is not responding

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine hesitation

Code P0400 1997 Ford F150 Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Μodule (ECΜ) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Μodulator. Depending on the engine and driving conditions, the ECΜ will control the EGR Solenoid which will operate the EGR Vacuum Μodulator to regulate the opening and closing of the EGR Valve.
The EGR system on recently built vehicles uses a step motor to control the flow rate of EGR from exhaust manifold. This motor has four winding phases. It operates according to the output pulse signal of the ECΜ. Two windings are turned ON and OFF in sequence. Each time an ON pulse is issued, the valve opens or closes, changing the flow rate. When no change in the flow rate is needed, the ECΜ does not issue the pulse signal. Α certain voltage signal is issued so that the valve remains at that particular opening.
OBDII Code P0400 1997 Ford F150 - Exhaust Gas Recirculation Flow - AutoCodes.com
P0400 1997 Ford F150 Code - Exhaust Gas Recirculation Flow

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