AutoCodes – RAM – P2122 RAM

P2122 RAM 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, Faulty Throttle Body Assembly, Accelerator Pedal Position Sensor harness is open or shorted. 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 RAM indicates Throttle/Pedal Position Sensor/Switch 'D' Circuit Low.
Common causes: Common causes include Faulty Accelerator Pedal Position (APP) Sensor, Faulty Throttle Body Assembly, Accelerator Pedal Position Sensor harness is open or shorted.
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 402

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 May 11, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2122 RAM 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 RAM - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low - AutoCodes.com — P2122 RAM Code - Throttle/Pedal Position Sensor/Switch 'D' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2122 RAM?

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

How to Fix the DTC P2122 RAM?

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 RAM 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 P2122 RAM Code

1. What does the OBDII code P2122 mean on a RAM vehicle?

P2122 indicates a low voltage issue in the Throttle/Pedal Position Sensor/Switch "D" circuit, which is responsible for monitoring the accelerator pedal position.

2. What are the common symptoms of code P2122 in a RAM?

Symptoms may include reduced engine performance, the vehicle going into limp mode, unresponsive acceleration, and the illumination of the check engine light.

3. What causes the P2122 code to appear on a RAM?

Common causes include a faulty throttle or pedal position sensor, damaged wiring or connectors in the circuit, or issues with the engine control module (ECM).

4. Can I drive my RAM with the P2122 code active?

Driving with this code is not recommended as it can cause reduced performance, safety concerns, and potential further damage to the vehicle.

5. How do I diagnose the P2122 code on my RAM?

Diagnose by using a scan tool to confirm the code, inspecting the throttle or pedal position sensor, checking wiring and connectors for damage, and testing the circuit for proper voltage.

6. How do I fix the P2122 code on a RAM vehicle?

Repairs may include replacing the throttle or pedal position sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/updating the ECM if necessary.

7. How much does it cost to repair the P2122 code on a RAM?

Repairs can cost between $100 and $300, depending on whether the issue is with the sensor, wiring, or ECM reprogramming.

8. Can a dirty throttle body cause the P2122 code on a RAM?

While rare, a dirty throttle body may indirectly contribute to sensor issues. Cleaning it can sometimes help but is not a guaranteed fix for this specific code.

9. How can I prevent the P2122 code from recurring on my RAM?

Regular maintenance, inspecting wiring and connectors for damage, and ensuring that sensors are clean and functioning properly can help prevent this code.

10. Does the P2122 code always mean the sensor is bad?

No, the P2122 code can also be caused by wiring issues, corroded connectors, or problems with the ECM, so proper diagnosis is essential.