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P0122 2000 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

Quick Answer

The P0122 diagnostic trouble code (DTC) for a 2000 Honda Civic refers to the Throttle Position Sensor 'A' Circuit Low Voltage. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit. 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 2000 Honda Civic indicates Throttle Position Sensor 'A' Circuit Low Voltage.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or poor connections in the sensor circuit.
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 P0122 2000 Honda Civic Description

The P0122 diagnostic trouble code (DTC) for a 2000 Honda Civic refers to the Throttle Position Sensor 'A' Circuit Low Voltage. The throttle position sensor (TPS) is a crucial component in the engine management system that monitors the position of the throttle valve. It sends this information to the engine control module (ECM) to regulate air-fuel mixture and ignition timing. When the ECM detects that the voltage from the TPS is lower than the expected range, it triggers the P0122 code.

OBDII Code P0122 2000 Honda Civic - Throttle Position Sensor 'A' Circuit Low Voltage
P0122 2000 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

Common Causes of P0122 2000 Honda Civic

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or poor connections in the sensor circuit
  4. Issues with the ECM or related engine control systems

Symptoms of P0122 2000 Honda Civic

  1. Hesitation or lack of response when accelerating
  2. Rough or erratic idling
  3. Stalling or difficulty starting the engine
  4. Reduced fuel efficiency
  5. Illumination of the check engine light

How to Fix P0122 2000 Honda Civic

  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 verify its voltage output at various throttle positions. Compare the readings to the manufacturer's specifications.
  3. If the TPS is found to be faulty, replace it with a new sensor from a reputable manufacturer.
  4. Check and repair any damaged wiring or connectors in the TPS circuit to ensure proper electrical connections.
  5. Clear the DTC using an OBD-II scanner and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P0122 2000 Honda Civic

The typical repair costs for addressing a P0122 code on a 2000 Honda Civic can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can range from $50 to $150, while repairing damaged wiring or connectors may add additional labor costs. Overall, the total repair cost, including parts and labor, could range from $100 to $300. As mentioned earlier, labor rates at auto repair shops can vary, so it is advisable to check local rates for a more accurate estimate.

When is the Code Detected?

An excessively low voltage from the Throttle Position Sensor (TPS) 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 P0122 2000 Honda Civic Code

1. What does OBDII code P0122 on a 2000 Honda Civic mean?

The code P0122 indicates a low voltage condition in the Throttle Position Sensor 'A' circuit of the vehicle.

2. What are the common symptoms of a P0122 code in a 2000 Honda Civic?

Common symptoms include poor acceleration, rough idling, stalling, and in some cases, the vehicle may go into a "limp mode" with reduced power.

3. What are the potential causes of a P0122 code in a 2000 Honda Civic?

Possible causes include a faulty throttle position sensor (TPS), damaged wiring or connectors in the TPS circuit, a corroded sensor connection, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose the source of a P0122 code in my 2000 Honda Civic?

To diagnose a P0122 code, you can use a multimeter to test the TPS voltage, check the wiring and connectors for any damage, and inspect the TPS for any signs of wear or malfunction.

5. How can I repair a P0122 code on my 2000 Honda Civic?

Repairing a P0122 code may involve replacing the throttle position sensor, repairing damaged wiring or connectors, cleaning corroded connections, or reprogramming the ECM.

6. Can I drive my 2000 Honda Civic with a P0122 code?

It is not recommended to drive your vehicle with a P0122 code as it can lead to further damage and unsafe driving conditions. It's best to address the issue promptly.

7. How much does it typically cost to repair a P0122 code on a 2000 Honda Civic?

The cost of repairing a P0122 code can vary depending on the root cause of the issue. Replacing a throttle position sensor can cost around $50 to $200, while fixing wiring or connector issues may require additional labor costs.

8. Will a P0122 code reset itself on a 2000 Honda Civic?

In some cases, a P0122 code may reset itself after a few driving cycles if the underlying issue was temporary. However, it's advisable to diagnose and repair the problem to prevent it from recurring.

9. Is it possible to prevent a P0122 code from appearing on a 2000 Honda Civic?

Regular maintenance and inspections of the throttle position sensor, wiring, and connectors can help prevent a P0122 code from appearing. Keeping these components clean and in good condition is key.

10. Can a P0122 code affect the fuel efficiency of a 2000 Honda Civic?

Yes, a P0122 code can impact the fuel efficiency of your vehicle as it may cause improper fuel delivery and affect the engine's performance, leading to decreased miles per gallon.

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