AutoCodes – Dodge – P2120 Dodge

P2120 Dodge Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

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: P2120 Dodge indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit.
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 4,748

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
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2120 Dodge 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 P2120 Dodge - Throttle/Pedal Position Sensor/Switch 'D' Circuit - AutoCodes.com — P2120 Dodge Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

What does this mean?

What are the Possible Causes of the DTC P2120 Dodge?

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 P2120 Dodge?

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 P2120 Dodge 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 P2120 Dodge Code

1. What are the common symptoms of OBDII code P2120 in a Dodge related to the Throttle/Pedal Position Sensor/Switch 'D' Circuit?

- Common symptoms can include issues with acceleration, rough idling, poor fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P2120 in a Dodge?

- The code P2120 can be triggered by a faulty throttle position sensor, wiring issues, a defective pedal position sensor, or a problem with the electronic throttle control system.

3. How can I diagnose the root cause of OBDII code P2120 in my Dodge?

- To diagnose the issue, you can use an OBDII scanner to read the trouble codes, visually inspect the wiring and connectors, test the throttle position sensor, and check the pedal position sensor for proper operation.

4. Can a DIY enthusiast repair OBDII code P2120 in a Dodge related to the Throttle/Pedal Position Sensor/Switch 'D' Circuit?

- While some basic diagnostics and checks can be done by a DIY enthusiast, repairing the root cause of the code may require specialized tools and expertise, especially if it involves sensor replacement or wiring repair.

5. Is it safe to continue driving my Dodge with OBDII code P2120 present?

- It is not recommended to drive your Dodge with an unresolved OBDII code P2120, as it can lead to further damage to the engine or components, and potentially compromise the safety and performance of the vehicle.

6. How much does it typically cost to repair OBDII code P2120 in a Dodge?

- The cost of repairing OBDII code P2120 can vary depending on the root cause of the issue, the labor rates in your area, and whether you choose to go to a dealership or an independent mechanic. It's advisable to get multiple quotes for an accurate estimate.

7. Can a faulty Throttle/Pedal Position Sensor/Switch 'D' Circuit cause other issues in my Dodge?

- Yes, a faulty sensor or circuit related to the throttle and pedal positions can lead to drivability issues, poor engine performance, and even trigger other trouble codes in the vehicle's onboard diagnostics system.

8. Are there any preventive maintenance tips to avoid encountering OBDII code P2120 in a Dodge?

- Regularly inspecting and cleaning the throttle body, ensuring proper engine maintenance, and addressing any warning signs related to engine performance can help prevent issues that may trigger OBDII code P2120.

9. How long does it typically take to repair OBDII code P2120 in a Dodge at a repair shop?

- The repair time for OBDII code P2120 can vary depending on the complexity of the issue, availability of parts, and the workload at the repair shop. It's recommended to inquire about the estimated repair time when scheduling an appointment.

10. Can resetting the ECU clear OBDII code P2120 in a Dodge?

- Resetting the ECU may temporarily clear the code, but if the underlying issue causing OBDII code P2120 is not addressed, the code is likely to reappear. It's essential to diagnose and fix the root cause of the problem for a lasting solution.