AutoCodes – Jeep – P2120 Jeep

P2120 Jeep 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 Jeep 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 3,805

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 Jeep 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 Jeep - Throttle/Pedal Position Sensor/Switch 'D' Circuit - AutoCodes.com — P2120 Jeep Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit

What does this mean?

What are the Possible Causes of the DTC P2120 Jeep?

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 Jeep?

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 Jeep 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 Jeep Code

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

Common symptoms include reduced engine power, poor acceleration, stalling, and the vehicle going into "limp mode."

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

The code P2120 can be triggered by issues such as a faulty throttle position sensor, damaged wiring or connectors, or a problem with the throttle pedal position sensor/switch.

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

Diagnosing the code involves using a scan tool to read the specific error codes, testing the throttle position sensor and pedal position sensor for proper operation, and inspecting the wiring and connectors for any damage.

4. Can driving with OBDII code P2120 in a Jeep cause further damage?

Continuing to drive with this code can potentially lead to more severe issues, such as engine misfires, decreased fuel efficiency, and damage to other components. It is recommended to address the problem promptly.

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

It is not recommended to drive the vehicle with this code active, as it can affect the engine performance and lead to safety concerns. It is best to have the issue diagnosed and repaired as soon as possible.

6. Are there any DIY repair tips for fixing OBDII code P2120 in a Jeep?

DIY repair tips include checking for loose or damaged wiring, ensuring proper connections of the throttle and pedal position sensors, and possibly replacing the sensors if they are found to be faulty.

7. Can resetting the OBDII system clear OBDII code P2120 in a Jeep?

Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again during vehicle operation.

8. How much does it typically cost to repair OBDII code P2120 in a Jeep?

The cost of repairing this code can vary depending on the specific cause of the issue. It may involve replacing sensors, repairing wiring, or addressing other related problems. Costs can range from a few hundred to over a thousand dollars.

9. Can extreme weather conditions affect the triggering of OBDII code P2120 in a Jeep?

Extreme weather conditions can potentially impact the sensors and wiring associated with the throttle and pedal position sensors, leading to the triggering of the P2120 code. It is important to keep these components well-maintained.

10. Are there any recalls or technical service bulletins related to OBDII code P2120 in Jeep vehicles?

It is advisable to check with the manufacturer or authorized Jeep service centers for any recalls or technical service bulletins related to OBDII code P2120 in your specific vehicle model.