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Engine-Codes – Pontiac – P0123 Pontiac

P0123 Pontiac Code - Throttle Position Sensor Circuit High Voltage

Quick Answer

The P0123 Pontiac code indicates a problem with the Throttle Position Sensor (TPS) circuit, specifically that the voltage being received is higher than the normal operating range. Common causes include Faulty Throttle Position Sensor, Wiring issues or shorts in the TPS circuit, Corrosion or poor connections in the TPS wiring. 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 Pontiac indicates Throttle Position Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Throttle Position Sensor, Wiring issues or shorts in the TPS circuit, Corrosion or poor connections in the TPS wiring.
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 12, 2024
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Code P0123 Pontiac Description

The P0123 Pontiac code indicates a problem with the Throttle Position Sensor (TPS) circuit, specifically that the voltage being received is higher than the normal operating range. The TPS is a crucial component of the engine management system, as it monitors the position of the throttle valve and sends this information to the engine control unit (ECU). This data is used to determine the appropriate air-fuel mixture for combustion, ignition timing, and other engine functions.

OBDII Code P0123 Pontiac - Throttle Position Sensor Circuit High Voltage
P0123 Pontiac Code - Throttle Position Sensor Circuit High Voltage

Common Causes of P0123 Pontiac

  1. Faulty Throttle Position Sensor
  2. Wiring issues or shorts in the TPS circuit
  3. Corrosion or poor connections in the TPS wiring
  4. ECU malfunction or software glitch
  5. Mechanical issues with the throttle body

Symptoms of P0123 Pontiac

  1. Rough idling or stalling
  2. Poor acceleration or hesitation
  3. Reduced engine power
  4. Check Engine Light illuminated
  5. Limp mode activation

How to Fix P0123 Pontiac

  1. Begin by diagnosing the issue using a scan tool to confirm the P0123 code and check the TPS voltage readings.
  2. Inspect the TPS wiring and connections for any signs of damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Test the Throttle Position Sensor using a multimeter to ensure it is functioning correctly. Replace the TPS if it is out of specification.
  4. Clear the error code and reset the ECU to see if the issue persists. Test drive the vehicle to verify that the symptoms have been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the throttle body or ECU.

Cost to Fix P0123 Pontiac

The typical repair costs for a Throttle Position Sensor Circuit High Voltage issue can range from $100 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local shops for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often offer more competitive pricing.

When is the Code Detected?

An excessively high voltage from the Throttle Position (TP) Sensor is sent to Engine Control Module (ECM).

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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 Pontiac Code

1. What are the common symptoms of OBDII code P0123 in a Pontiac related to the Throttle Position Sensor Circuit High Voltage?

- Common symptoms include issues with acceleration, poor fuel economy, stalling, and potential difficulty shifting gears.

2. What are the possible causes of OBDII code P0123 in a Pontiac indicating a Throttle Position Sensor Circuit High Voltage?

- The code can be triggered by a faulty throttle position sensor, damaged wiring in the sensor circuit, or a problem with the engine control module.

3. How can I diagnose the OBDII code P0123 in my Pontiac pointing to a Throttle Position Sensor Circuit High Voltage issue?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the throttle position sensor's voltage output, and inspecting the sensor wiring for any damage.

4. Can a dirty throttle body cause the OBDII code P0123 to be triggered in a Pontiac?

- Yes, a dirty throttle body can disrupt the sensor readings and potentially lead to a high voltage signal, triggering the P0123 code.

5. What are some repair tips for addressing the OBDII code P0123 related to the Throttle Position Sensor Circuit High Voltage in a Pontiac?

- Repair tips include cleaning the throttle body, inspecting and repairing any damaged sensor wiring, and replacing the throttle position sensor if necessary.

6. Is it safe to continue driving my Pontiac with the OBDII code P0123 indicating a Throttle Position Sensor Circuit High Voltage issue?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

7. Can a DIY enthusiast replace the throttle position sensor in a Pontiac to resolve the OBDII code P0123?

- Yes, replacing the throttle position sensor can be a DIY project with the right tools and knowledge. However, if unsure, it is recommended to seek professional help.

8. How much does it typically cost to repair the OBDII code P0123 related to the Throttle Position Sensor Circuit High Voltage in a Pontiac?

- Costs can vary depending on the exact cause of the issue, but generally, replacing a throttle position sensor can range from $50 to $200, excluding labor charges.

9. Will resetting the OBDII code P0123 in my Pontiac temporarily fix the issue related to the Throttle Position Sensor Circuit High Voltage?

- Resetting the code may temporarily clear the error, but if the underlying issue with the throttle position sensor or wiring is not addressed, the code is likely to reappear.

10. How long does it typically take to repair the OBDII code P0123 Pontiac indicating a Throttle Position Sensor Circuit High Voltage problem?

- The repair time can vary based on the exact cause of the issue and the expertise of the person performing the repair. Generally, it can take anywhere from 30 minutes to a few hours to address this problem.

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