16507/P0123/000291 DTC Code


In the world of automotive diagnostics, trouble codes are used to identify specific issues that may be occurring within a vehicle’s engine or various systems. One such trouble code is the 16507/P0123/000291 DTC code. In this article, we will delve deep into the meaning and significance of this code, its potential triggers, and possible solutions to resolve it.

Understanding the 16507/P0123/000291 DTC Code

The 16507/P0123/000291 DTC code refers to a potential malfunction detected in a vehicle’s Throttle/Pedal Position Sensor/Switch “A” Circuit High. This code is often associated with issues pertaining to the throttle/pedal position sensor or its circuitry, indicating an abnormal high voltage signal is being received by the vehicle’s engine control module (ECM).

Possible Causes of the 16507/P0123/000291 DTC Code

There are several factors that can trigger the 16507/P0123/000291 DTC code. Some of the most common causes include:

  1. Faulty Throttle/Pedal Position Sensor: A malfunctioning throttle/pedal position sensor can send inaccurate voltage signals to the ECM, causing the code to be triggered.

  2. Open or Shorted Circuits: Damaged or broken wiring harnesses, connectors, or circuits associated with the throttle/pedal position sensor can disrupt the normal voltage flow, leading to the code being stored.

  3. Faulty ECM: In rare cases, a faulty ECM may incorrectly interpret the voltage signals from the throttle/pedal position sensor, resulting in the code being set.

Diagnosing the 16507/P0123/000291 DTC Code

When faced with the 16507/P0123/000291 DTC code, it is crucial to follow a systematic approach to accurately diagnose and resolve the issue. Here are the steps typically undertaken during the diagnostic process:

Step 1: Visual Inspection

Begin by performing a visual inspection of the throttle/pedal position sensor, its wiring harness, and related electrical components. Look for any signs of damage, loose connections, or corrosion that may be causing the abnormal voltage readings.

Step 2: Throttle/Pedal Position Sensor Testing

Use a multimeter to test the resistance and voltage output of the throttle/pedal position sensor. Compare the measured values with manufacturer specifications to determine if the sensor is functioning correctly.

Step 3: Circuit Testing

Next, conduct a thorough circuit test to identify any open or shorted circuits that may be causing the problem. This involves inspecting the wiring harness, connectors, and associated electrical components for continuity and proper voltage flow.

Step 4: ECM Evaluation

In cases where the previous steps haven’t uncovered any issues, it may be necessary to evaluate the ECM. This can be done by conducting a comprehensive ECM diagnostic or replacing it with a known-working unit to see if the code persists.

Resolving the 16507/P0123/000291 DTC Code

Once the issue triggering the 16507/P0123/000291 DTC code has been identified, appropriate measures can be taken to rectify the problem. Here are some potential solutions:

  • Replacing the Throttle/Pedal Position Sensor: If the sensor is found to be faulty, replacing it with a new, OEM-quality sensor can resolve the issue and clear the code.

  • Repairing or Replacing Wiring Harnesses: When open or shorted circuits are to blame, repairing damaged wiring, connectors, or harnesses can restore proper voltage flow and eliminate the code.

  • Replacing the ECM: In rare cases where the ECM is determined to be the cause of the problem, replacing it with a functioning unit may be necessary to successfully clear the code.

Frequently Asked Questions (FAQs)

Q1: Can the 16507/P0123/000291 DTC code cause serious damage to my vehicle?

A1: The 16507/P0123/000291 DTC code itself does not pose an immediate threat to the vehicle’s drivability or safety. However, if left unresolved, it can lead to suboptimal engine performance and increased fuel consumption. Therefore, it is recommended to address the issue promptly.

Q2: How much does it typically cost to resolve the 16507/P0123/000291 DTC code?

A2: The cost associated with resolving the 16507/P0123/000291 DTC code can vary depending on the specific cause of the issue and the make and model of the vehicle. Generally, expenses range from around $100 for sensor replacement to several hundred dollars for more extensive repairs.

Q3: Is it possible to reset the 16507/P0123/000291 DTC code without fixing the underlying issue?

A3: While it is possible to clear the code using an OBD-II scanner or by disconnecting the battery, it is crucial to understand that doing so without addressing the underlying problem will only result in the code reappearing. It is always recommended to diagnose and resolve the root cause before attempting to clear the code.

In conclusion, the 16507/P0123/000291 DTC code is associated with a potential issue in the throttle/pedal position sensor circuitry. By following a systematic diagnostic approach and resolving the underlying problem, vehicle owners can ensure optimal engine performance and reliability. If you encounter this code, it is advisable to seek the assistance of a qualified automotive technician to ensure accurate diagnosis and resolution.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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