AutoCodes – Honda – P0122 1999 Honda Civic

P0122 1999 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

Quick Answer

The Throttle Pedal Position (TPP) responds to the accelerator pedal movement. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection. 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 Honda Civic indicates Throttle Position Sensor 'A' Circuit Low Voltage.
Common causes: Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection.
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.

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Code Popularity 9,383

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0122 1999 Honda Civic Description

The Throttle Pedal Position (TPP) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

OBDII Code P0122 1999 Honda Civic - Throttle Position Sensor 'A' Circuit Low Voltage - AutoCodes.com — P0122 1999 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0122 1999 Honda Civic?

Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection

How to Fix the DTC P0122 1999 Honda Civic?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0122 1999 Honda Civic code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Honda Civic Code

1. What are the common symptoms of OBDII code P0122 in a 1999 Honda Civic?

- Common symptoms include issues with acceleration, poor engine performance, stalling, and difficulty maintaining a steady speed.

2. What does the OBDII code P0122 indicate in a 1999 Honda Civic?

- OBDII code P0122 in a 1999 Honda Civic indicates a low voltage condition in the throttle position sensor 'A' circuit.

3. What are the possible causes of OBDII code P0122 in a 1999 Honda Civic?

- Possible causes include a faulty throttle position sensor, damaged wiring in the TPS circuit, a corroded connector, or a problem with the PCM.

4. How can I diagnose the OBDII code P0122 in my 1999 Honda Civic?

- Diagnose the code by using an OBDII scanner to retrieve the code, visually inspecting the TPS and its wiring, testing the TPS voltage, and checking for any loose connections.

5. Can I drive my 1999 Honda Civic with OBDII code P0122?

- It is not recommended to drive your Honda Civic with code P0122 as it can lead to further engine issues and potentially unsafe driving conditions.

6. How do I repair OBDII code P0122 in my 1999 Honda Civic?

- Repair options include replacing the throttle position sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the PCM.

7. Is it necessary to reset the OBDII code P0122 after repairs in a 1999 Honda Civic?

- Yes, it is recommended to clear the code after repairs to see if the issue has been resolved and to prevent any confusion with future diagnostics.

8. Can a DIY enthusiast fix OBDII code P0122 in a 1999 Honda Civic?

- Yes, some repairs related to code P0122 can be performed by a DIY enthusiast with the right tools, knowledge, and attention to detail.

9. Will ignoring OBDII code P0122 in my 1999 Honda Civic cause further damage?

- Ignoring code P0122 can lead to poor engine performance, decreased fuel efficiency, and potential damage to other engine components over time.

10. How can I prevent OBDII code P0122 from appearing in my 1999 Honda Civic in the future?

- To prevent code P0122, regularly inspect and maintain your throttle position sensor, check for wiring issues, and address any engine performance concerns promptly.