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Engine-Codes – Ford – P0123 1999 Ford F150

P0123 1999 Ford F150 Code - Throttle Position Circuit High Input

Quick Answer

The P0123 diagnostic trouble code for a 1999 Ford F150 indicates a Throttle Position Circuit High Input. Common causes include Faulty throttle position sensor, Corroded or damaged wiring/connectors in the throttle position circuit, ECM software issue. 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 1999 Ford F150 indicates Throttle Position Circuit High Input .
Common causes
Common causes include Faulty throttle position sensor, Corroded or damaged wiring/connectors in the throttle position circuit, ECM software issue.
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 11, 2024
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Code P0123 1999 Ford F150 Description

The P0123 diagnostic trouble code for a 1999 Ford F150 indicates a Throttle Position Circuit High Input. This means that the Engine Control Module (ECM) has detected a higher than expected voltage signal from the throttle position sensor. The throttle position sensor is a crucial component that helps the ECM determine the correct air-fuel mixture for optimal engine performance. When the signal is higher than expected, it can lead to a variety of issues that can affect the vehicle's performance and drivability.

OBDII Code P0123 1999 Ford F150 - Throttle Position Circuit High Input
P0123 1999 Ford F150 Code - Throttle Position Circuit High Input

Common Causes of P0123 1999 Ford F150

  1. Faulty throttle position sensor
  2. Corroded or damaged wiring/connectors in the throttle position circuit
  3. ECM software issue
  4. Throttle body malfunction
  5. Throttle position sensor out of adjustment

Symptoms of P0123 1999 Ford F150

  1. Poor fuel efficiency
  2. Rough idling or stalling
  3. Hesitation or surging during acceleration
  4. Engine misfires
  5. Limp mode activation

How to Fix P0123 1999 Ford F150

  1. Begin by diagnosing the issue using a scan tool to confirm the P0123 code and identify the root cause.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion. Replace any faulty components.
  3. Check the throttle body for any signs of malfunction and clean it if necessary.
  4. Adjust the throttle position sensor if it is out of alignment.
  5. Clear the error code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0123 1999 Ford F150

The typical repair costs for addressing a P0123 code in a 1999 Ford F150 may range from $100 to $300, depending on the specific cause of the issue and the required parts and labor. It is important to note that the actual cost can vary based on the location, dealership or independent repair shop rates, and the extent of the repair needed. It is advisable to consult with a professional mechanic to get an accurate estimate for the repair.

What does this mean?

Tech Notes for P0123 1999 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 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0123 on a 1999 Ford F150?

The common symptoms of code P0123 on a 1999 Ford F150 include issues with acceleration, rough idling, poor fuel economy, and potentially even stalling.

2. What does the OBDII code P0123 indicate on a 1999 Ford F150?

OBDII code P0123 on a 1999 Ford F150 indicates a Throttle Position Circuit High Input error, meaning the signal from the throttle position sensor is higher than expected by the engine control module.

3. What are the possible causes of OBDII code P0123 on a 1999 Ford F150?

Possible causes of code P0123 on a 1999 Ford F150 include a faulty throttle position sensor, damaged wiring or connectors in the throttle position circuit, or issues with the engine control module.

4. How can I diagnose the OBDII code P0123 on my 1999 Ford F150?

To diagnose code P0123 on a 1999 Ford F150, you can use an OBDII scanner to retrieve the code, visually inspect the throttle position sensor and its wiring, and perform voltage tests to check for proper signal output.

5. Can I still drive my 1999 Ford F150 with OBDII code P0123?

It is not recommended to drive your 1999 Ford F150 with OBDII code P0123, as it can lead to poor engine performance and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P0123 on a 1999 Ford F150?

To repair code P0123 on a 1999 Ford F150, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or reset the engine control module after fixing the issue.

7. Is it possible to reset OBDII code P0123 on a 1999 Ford F150 without fixing the underlying problem?

While you can clear the code using an OBDII scanner, it is not recommended to do so without addressing the root cause, as the issue may persist and lead to further problems.

8. How much does it cost to fix OBDII code P0123 on a 1999 Ford F150?

The cost of fixing code P0123 on a 1999 Ford F150 can vary depending on the specific issue, but it may involve replacing the throttle position sensor, which can cost between $50 to $200, plus labor charges.

9. Can a DIY enthusiast repair OBDII code P0123 on a 1999 Ford F150?

A DIY enthusiast with the necessary tools and knowledge of automotive repair may be able to fix code P0123 on a 1999 Ford F150 by replacing the throttle position sensor or repairing wiring issues.

10. How often does OBDII code P0123 occur in a 1999 Ford F150?

Code P0123 can occur in a 1999 Ford F150 due to various factors, but it is not considered a common issue. Proper maintenance and timely sensor replacements can help prevent this error.

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