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Engine-Codes – Ford – P0123 1997 Ford F150

P0123 1997 Ford F150 Code - Throttle Position Circuit High Input

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates a problem with the throttle position sensor (TPS) circuit registering a high input. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Malfunctioning ECM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0123 1997 Ford F150 indicates Throttle Position Circuit High Input .
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Malfunctioning ECM.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P0123 1997 Ford F150 Description

The P0123 diagnostic trouble code (DTC) for a 1997 Ford F150 indicates a problem with the throttle position sensor (TPS) circuit registering a high input. The TPS is a crucial component that monitors the position of the throttle valve and sends this information to the engine control module (ECM) to adjust fuel delivery and ignition timing. When the TPS circuit reports a high input, it means that the voltage signal from the sensor is outside the expected range, potentially leading to incorrect fuel and air mixture adjustments.

OBDII Code P0123 1997 Ford F150 - Throttle Position Circuit High Input
P0123 1997 Ford F150 Code - Throttle Position Circuit High Input

Common Causes of P0123 1997 Ford F150

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Malfunctioning ECM
  4. Mechanical issue with the throttle body
  5. Corrosion or contamination in the TPS circuit

Symptoms of P0123 1997 Ford F150

  1. Erratic idling
  2. Stalling
  3. Hesitation during acceleration
  4. Poor acceleration
  5. Engine misfires

How to Fix P0123 1997 Ford F150

  1. Begin by conducting a thorough inspection of the throttle position sensor, wiring, and connectors for any visible damage or corrosion.
  2. Test the TPS using a multimeter to check for proper voltage output at various throttle positions.
  3. If the TPS is faulty, replace it with a new sensor following the manufacturer's guidelines.
  4. Clear the DTC from the ECM using a scan tool and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be necessary to identify any underlying issues with the ECM or throttle body.

Cost to Fix P0123 1997 Ford F150

The typical repair costs for addressing a throttle position circuit high input issue can range from $100 to $300, depending on the cost of the replacement TPS and any additional parts or labor required. It's important to note that specific diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more competitive pricing.

What does this mean?

Tech Notes for P0123 1997 Ford F150

The TP sensor circuit is monitored by the PCM for a high TP rotation angle (or voltage) input through the comprehensive component monitor (CCM). If during key ON engine OFF or key ON engine running the TP rotation angle (or voltage) changes above maximum calibrated limit, the test fails.

A TP PID (TP V PID) reading greater than 93% (4.65 volts) in key ON engine OFF, continuous memory or key ON engine running indicates a hard fault.

When is the Code Detected?

The Throttle Position Sensor (TPS) signal 1 circuit has reported a high voltage

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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 P0123 1997 Ford F150 Code

1. What are the common symptoms of OBDII code P0123 in a 1997 Ford F150?

- Common symptoms include poor acceleration, stalling, rough idling, and difficulty shifting gears.

2. What does the OBDII code P0123 "Throttle Position Circuit High Input" mean for a 1997 Ford F150?

- This code indicates that the throttle position sensor is reporting a higher than normal voltage to the vehicle's engine control module.

3. What are the possible causes of OBDII code P0123 in a 1997 Ford F150?

- The common causes include a faulty throttle position sensor, damaged wiring or connectors in the throttle position circuit, or a malfunctioning engine control module.

4. How can I diagnose the OBDII code P0123 in a 1997 Ford F150?

- Diagnosing this code typically involves using a scan tool to read the error codes, checking the throttle position sensor for proper operation, and inspecting the wiring and connectors for any damage.

5. Can I drive my 1997 Ford F150 with OBDII code P0123?

- It is not recommended to drive your vehicle with this code as it can lead to poor performance and potential safety hazards. It's best to address the issue promptly.

6. How do I repair OBDII code P0123 in my 1997 Ford F150?

- Repairing this code may involve replacing the throttle position sensor, repairing any damaged wiring or connectors, or reprogramming the engine control module if necessary.

7. Is it possible to reset OBDII code P0123 in a 1997 Ford F150 without fixing the underlying issue?

- While you can clear the error code with a scan tool, the underlying issue causing the code will persist, leading to the code reappearing until the problem is resolved.

8. Can a dirty throttle body cause OBDII code P0123 in a 1997 Ford F150?

- A dirty throttle body can potentially cause erratic readings from the throttle position sensor, leading to the code being triggered. Cleaning the throttle body may help resolve the issue.

9. How much does it cost to fix OBDII code P0123 in a 1997 Ford F150?

- The cost of fixing this code can vary depending on the specific issue causing it. Replacing a throttle position sensor can cost around $100-$200, while addressing wiring or module issues may be more expensive.

10. Will OBDII code P0123 cause my 1997 Ford F150 to fail an emissions test?

- Yes, this code can lead to increased emissions and potentially cause your vehicle to fail an emissions test. It's important to address the issue to ensure your vehicle meets emissions standards.

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