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AutoCodes – Generic – P2122

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

Quick Answer

The Accelerator Pedal Position (APP) sensor is an input to the Powertrain Control Module (PCM) and used to determine the amount of torque requested by the operator. Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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
P2122 indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit Low.
Common causes
Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Accelerator Pedal Position (APP) Sensor harness is open or shorted, Accelerator Pedal Position (APP) 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 89,437
How popular is this code, among other codes? Medium
What is this?
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P2122 Description

The Accelerator Pedal Position (APP) sensor is an input to the Powertrain Control Module (PCM) and used to determine the amount of torque requested by the operator. There are 2 pedal position signals in the sensor. Both signals, APP and APP2, have a positive slope (increasing angle, increasing voltage), but are offset and increase at different rates. The 2 pedal position signals make sure the PCM receives a correct input even if 1 signal has a concern. The PCM determines if a signal is incorrect by calculating where it should be, inferred from the other signals. If a concern is present with one of the circuits the other input is used. There are 2 reference voltage circuits, 2 signal return circuits, and 2 signal circuits (a total of 6 circuits and pins) between the PCM and the APP sensor assembly. The pedal position signal is converted to pedal travel degrees (rotary angle) by the PCM. The software converts these degrees to counts, which is the input to the torque based strategy.
OBDII Code P2122 - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low - AutoCodes.com
P2122 Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low
What does this mean?

What are the Possible Causes of the DTC P2122?

  • Faulty Accelerator Pedal Position (APP) Sensor
  • Accelerator Pedal Position (APP) Sensor harness is open or shorted
  • Accelerator Pedal Position (APP) Sensor circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)

How to Fix the DTC P2122?

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 P2122 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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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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