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Engine-Codes – Ford – P0122 1999 Ford F150

P0122 1999 Ford F150 Code - Throttle Position Sensor Circuit Low Input

Quick Answer

The diagnostic trouble code P0122 for a 1999 Ford F150 indicates a Throttle Position Sensor (TPS) Circuit Low Input. Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the 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
P0122 1999 Ford F150 indicates Throttle Position Sensor Circuit Low Input .
Common causes
Common causes include Faulty throttle position sensor, Damaged or corroded wiring/connectors in the TPS circuit, Issues with the 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 07, 2024
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Code P0122 1999 Ford F150 Description

The diagnostic trouble code P0122 for a 1999 Ford F150 indicates a Throttle Position Sensor (TPS) Circuit Low Input. The throttle position sensor is a crucial component of the vehicle's electronic throttle control system, responsible for monitoring the position of the throttle pedal and sending signals to the engine control module (ECM) to adjust the air-fuel mixture for optimal performance. When the TPS circuit detects a lower than expected voltage input, it triggers this code, indicating a potential issue with the sensor or its circuit.

OBDII Code P0122 1999 Ford F150 - Throttle Position Sensor Circuit Low Input
P0122 1999 Ford F150 Code - Throttle Position Sensor Circuit Low Input

Common Causes of P0122 1999 Ford F150

  1. Faulty throttle position sensor
  2. Damaged or corroded wiring/connectors in the TPS circuit
  3. Issues with the ECM
  4. Mechanical obstruction affecting the throttle movement
  5. Incorrect TPS adjustment or calibration

Symptoms of P0122 1999 Ford F150

  1. Rough idling or unstable engine RPM
  2. Hesitation or lack of response when accelerating
  3. Engine stalling or difficulty starting
  4. Poor fuel efficiency
  5. Illumination of the check engine light

How to Fix P0122 1999 Ford F150

  1. Begin by diagnosing the TPS using a multimeter to check for proper voltage output.
  2. Inspect the wiring and connectors in the TPS circuit for any damage or corrosion, repairing or replacing as necessary.
  3. If the TPS sensor is faulty, replace it with a new OEM or aftermarket unit.
  4. Perform a recalibration of the TPS sensor to ensure accurate throttle position readings.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0122 1999 Ford F150

The typical repair costs for addressing a Throttle Position Sensor Circuit Low Input code (P0122) in a 1999 Ford F150 can range from $100 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

What does this mean?

Tech Notes for P0122 1999 Ford F150

The TP sensor circuit is monitored by the PCM for a low 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 below a minimum calibrated limit, the test fails.

Fault exhibits a symptom of limited power. A TP PID (TP VPID) reading less than 3.42% (0.17 volt) 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 an open or low 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 P0122 1999 Ford F150 Code

1. What are the common symptoms of OBDII code P0122 in a 1999 Ford F150?

- Common symptoms include poor acceleration, stalling, rough idling, and a decrease in fuel efficiency.

2. What does the OBDII code P0122 indicate in a 1999 Ford F150?

- The code indicates a Throttle Position Sensor Circuit Low Input, meaning the sensor is sending a lower than expected voltage signal to the engine control module.

3. What are the possible causes of OBDII code P0122 in a 1999 Ford F150?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

4. How can I diagnose the Throttle Position Sensor (TPS) in a 1999 Ford F150 to address code P0122?

- You can use a multimeter to test the TPS for proper voltage output according to manufacturer specifications. Inspect the wiring and connectors for any signs of damage.

5. Can a dirty throttle body cause OBDII code P0122 in a 1999 Ford F150?

- Yes, a dirty throttle body can affect the TPS readings and lead to a low input error. Regular maintenance of the throttle body can help prevent this issue.

6. Is it safe to continue driving a 1999 Ford F150 with OBDII code P0122?

- It is not recommended to continue driving with this code as it can lead to poor engine performance and potential safety hazards. It is best to address the issue promptly.

7. How can I reset the OBDII code P0122 in a 1999 Ford F150 after making repairs?

- You can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.

8. Can a DIY enthusiast repair OBDII code P0122 in a 1999 Ford F150?

- Depending on your skill level and access to tools, you may be able to replace the throttle position sensor or repair wiring issues yourself. However, it is recommended to consult a professional if unsure.

9. Will OBDII code P0122 cause the check engine light to illuminate in a 1999 Ford F150?

- Yes, the code will trigger the check engine light to illuminate on the dashboard of the vehicle to alert the driver of a potential issue with the throttle position sensor.

10. How long does it typically take to repair OBDII code P0122 in a 1999 Ford F150?

- The repair time can vary depending on the exact cause of the issue. Simple fixes like replacing the throttle position sensor may take around 1-2 hours, while more complex wiring repairs could take longer.

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