AutoCodes – Jeep – P2128 Jeep

P2128 Jeep Code - Throttle/Pedal Position Sensor/Switch 'E' Circuit High

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: P2128 Jeep indicates Throttle/Pedal Position Sensor/Switch 'E' Circuit High.
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 1,832

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 Sep 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2128 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 P2128 Jeep - Throttle/Pedal Position Sensor/Switch 'E' Circuit High - AutoCodes.com — P2128 Jeep Code - Throttle/Pedal Position Sensor/Switch 'E' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2128 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 P2128 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 P2128 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 P2128 Jeep Code

1. What does the OBDII code P2128 mean on a Jeep?

P2128 indicates a high voltage issue in the Throttle/Pedal Position Sensor/Switch "E" circuit, which monitors the position of the accelerator pedal.

2. What are the symptoms of code P2128 on a Jeep?

Common symptoms include reduced engine power, poor acceleration, the throttle becoming unresponsive, and the activation of the Check Engine Light.

3. What causes the P2128 code to appear?

Possible causes include a faulty throttle or pedal position sensor, damaged wiring or connectors in the sensor circuit, or corrosion affecting the electrical connections.

4. Can I drive my Jeep with the P2128 code active?

Driving with this code is not recommended as it may cause reduced throttle response, lead to unsafe driving conditions, or further damage the vehicle's throttle system.

5. How do I diagnose the P2128 code on my Jeep?

Use an OBDII scanner to confirm the code, inspect the throttle/pedal position sensor and its wiring for damage or corrosion, and check the voltage readings from the sensor.

6. How do I fix the P2128 code on my Jeep?

Repairs may include replacing the throttle/pedal position sensor, repairing or replacing damaged wiring or connectors, or cleaning corroded electrical contacts in the circuit.

7. How much does it cost to fix the P2128 code on a Jeep?

The cost can vary but typically ranges from $100 to $300, depending on whether you replace the sensor, repair wiring, or require professional labor.

8. Can a bad battery cause the P2128 code on a Jeep?

Yes, a weak or failing battery can sometimes cause voltage irregularities that trigger sensor-related codes like P2128.

9. Does the P2128 code always mean the sensor is bad?

No, the issue might also be due to wiring problems, corroded connectors, or a problem with the vehicleâ€™s engine control module (ECM).

10. How can I prevent the P2128 code from recurring on my Jeep?

Regularly inspect and maintain the throttle/pedal position sensor, ensure wiring and connectors are secure and free of corrosion, and address any electrical issues promptly.