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Engine-Codes – Generic – P2122

P2122 Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low

Quick Answer

The P2122 diagnostic trouble code indicates an issue with the throttle/pedal position sensor/switch 'D' circuit being lower than the expected voltage range. Common causes include Faulty throttle/pedal position sensor/switch, Damaged wiring or connectors in the sensor circuit, Electronic throttle control system malfunction. 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
P2122 indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit Low.
Common causes
Common causes include Faulty throttle/pedal position sensor/switch, Damaged wiring or connectors in the sensor circuit, Electronic throttle control system malfunction.
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 08, 2024
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Code P2122 Description

The P2122 diagnostic trouble code indicates an issue with the throttle/pedal position sensor/switch 'D' circuit being lower than the expected voltage range. This sensor is crucial for the proper functioning of the electronic throttle control system, which regulates the engine's air intake based on driver input. When the sensor detects that the throttle or pedal position is lower than expected, it can lead to performance issues and potentially unsafe driving conditions.

OBDII Code P2122 - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
P2122 Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low

Common Causes of P2122

  1. Faulty throttle/pedal position sensor/switch
  2. Damaged wiring or connectors in the sensor circuit
  3. Electronic throttle control system malfunction
  4. Corrosion or moisture in the sensor connections
  5. Poor electrical connection or ground issues

Symptoms of P2122

  1. Reduced acceleration or lack of response when pressing the gas pedal
  2. Engine hesitation or stalling when accelerating
  3. Rough idling or erratic engine behavior
  4. Illumination of the check engine light
  5. Vehicle going into limp mode

How to Fix P2122

  1. Begin by diagnosing the issue using a scan tool to retrieve the trouble codes and pinpoint the exact cause.
  2. Inspect the throttle/pedal position sensor/switch 'D' circuit for any visible damage, corrosion, or loose connections.
  3. Test the sensor's voltage output using a multimeter to determine if it falls within the specified range.
  4. Replace the throttle/pedal position sensor/switch if it is found to be faulty.
  5. Clear the trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2122

The cost of repairing a P2122 code can vary depending on the specific cause of the issue and the vehicle's make and model. On average, the cost of replacing a throttle/pedal position sensor can range from $100 to $300, including parts and labor. Additional costs may apply if other components or wiring need to be replaced. It's recommended to consult with a mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of your vehicle. Labor rates at auto repair shops typically range between $80 and $150 per hour.

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Code P2122 Information for Specific Makes

  • P2122 Acura — Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit Low Voltage
  • P2122 BMW — Throttle/Pedal Positio Sensor/Switch 'D' Circuit Low
  • P2122 Buick — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
  • P2122 Cadillac — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
  • P2122 Chevrolet — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
  • P2122 Chrysler — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Dodge — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Ford — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 GMC — Accelerator Pedal Position Sensor 1 Circuit Low Voltage
  • P2122 Honda — Accelerator Pedal Position Sensor 'A' Throttle Position Sensor 'D' Circuit Low Voltage
  • P2122 Hyundai — Accelerator Position Circuit - Low Input
  • P2122 Infiniti — Accelerator Pedal Position Sensor Circuit Range/Performance
  • P2122 Jeep — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Lexus — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
  • P2122 Lincoln — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Mercedes-Benz — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Mercury — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 MINI — Throttle/Pedal Positio Sensor/Switch 'D' Circuit Low
  • P2122 Nissan — Accelerator Pedal Position Sensor Circuit Range/Performance
  • P2122 RAM — Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
  • P2122 Scion — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
  • P2122 Toyota — Throttle Pedal Position Sensor/Switch 'D' Circuit Input Low
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 P2122 Code

What does OBDII code P2122 mean?

Code P2122 indicates that the Engine Control Module (ECM) has detected a low voltage signal from the throttle/pedal position sensor or switch "D" circuit, which may affect throttle response.

What are the common symptoms of code P2122?

Symptoms include reduced engine performance, poor throttle response, the vehicle going into limp mode, and the illumination of the check engine light.

What causes code P2122 to be triggered?

Common causes include a faulty throttle or pedal position sensor, damaged wiring or connectors in the circuit, a malfunctioning ECM, or calibration issues.

Can I drive my vehicle with a P2122 code?

Driving with this code is not recommended as it may result in limited throttle response and unsafe driving conditions due to limp mode.

How is code P2122 diagnosed?

A technician will use an OBDII scanner to confirm the code, inspect the wiring and connectors for damage, and test the throttle/pedal position sensor for proper voltage and functionality.

How do you fix code P2122?

Repairs may include replacing the throttle or pedal position sensor, repairing damaged wiring or connectors, recalibrating the sensor, or, in rare cases, replacing the ECM.

Can a dirty throttle body cause code P2122?

While a dirty throttle body is not a direct cause, it can contribute to throttle position issues, so cleaning it may help resolve related symptoms.

How much does it cost to fix a P2122 code?

The repair cost varies, ranging from $100 to $300 for sensor replacement, while wiring repairs or ECM replacement can cost more depending on labor and parts.

What tools are needed to troubleshoot code P2122?

Common tools include an OBDII scanner, multimeter for voltage testing, and basic hand tools for inspecting or replacing components.

Does a P2122 code always mean the throttle/pedal position sensor is bad?

No, it can also be caused by wiring issues, connector problems, or an ECM malfunction, so proper diagnosis is essential before replacing parts.

Discuss the causes and fixes for P2122 OBDII Code

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