AutoCodes – Chrysler – P2128 Chrysler

P2128 Chrysler 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 Chrysler 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 1,302

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 Chrysler 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 Chrysler - Throttle/Pedal Position Sensor/Switch 'E' Circuit High - AutoCodes.com — P2128 Chrysler Code - Throttle/Pedal Position Sensor/Switch 'E' Circuit High

What does this mean?

What are the Possible Causes of the DTC P2128 Chrysler?

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 Chrysler?

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 Chrysler 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 Chrysler Code

1. What does the OBDII code P2128 mean for a Chrysler vehicle?

P2128 indicates a high voltage issue in the Throttle/Pedal Position Sensor/Switch 'E' Circuit, which is part of the electronic throttle control system.

2. What are the common symptoms of code P2128 in a Chrysler?

Symptoms may include reduced engine performance, the throttle not responding properly, the Check Engine Light illuminating, and the vehicle entering limp mode.

3. What causes the P2128 code to appear?

Common causes include a faulty throttle/pedal position sensor, damaged or corroded wiring, a poor electrical connection in the circuit, or a malfunctioning PCM (Powertrain Control Module).

4. Can I drive my Chrysler with the P2128 code?

Driving with this code is not recommended, as it can lead to reduced throttle response and unsafe driving conditions due to potential limp mode activation.

5. How do I diagnose the P2128 code in my Chrysler?

Start by inspecting the throttle/pedal position sensor and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

6. How do I fix the P2128 code on a Chrysler?

Repairs may involve replacing the throttle/pedal position sensor, repairing or replacing damaged wiring, cleaning corroded connections, or updating/replacing the PCM if necessary.

7. How much does it cost to repair the P2128 code on a Chrysler?

The repair cost varies, but replacing a throttle/pedal position sensor typically ranges between $100-$300, depending on parts and labor.

8. Can a dirty throttle body cause the P2128 code?

While a dirty throttle body can cause throttle-related issues, it is not a direct cause of P2128. The code specifically relates to the sensor circuit voltage.

9. Does the P2128 code require reprogramming the PCM?

Reprogramming the PCM is only necessary if it is determined to be faulty or if a software update is required as part of the diagnostic process.

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

Regular maintenance, including inspecting and cleaning electrical connections and ensuring proper care of the throttle system, can help prevent this code from recurring.