P2128 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'E' Circuit High
Quick Answer
This fault code is stored in the Engine Control Module (ECM) when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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 Mercedes-Benz indicates Throttle/Pedal Position Sensor/Switch 'E' Circuit High.
- Common causes
- Common causes include Faulty Accelerator Pedal Position Sensor, Accelerator Pedal Position Sensor harness is open or shorted, Accelerator Pedal Position 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.
Code P2128 Mercedes-Benz Description
What are the Possible Causes of the DTC P2128 Mercedes-Benz?
- Faulty Accelerator Pedal Position Sensor
- Accelerator Pedal Position Sensor harness is open or shorted
- Accelerator Pedal Position Sensor circuit poor electrical connection
How to Fix the DTC P2128 Mercedes-Benz?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2128 Mercedes-Benz 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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Frequently Asked Questions about P2128 Mercedes-Benz Code
1. What does the OBDII code P2128 mean on a Mercedes-Benz?
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 common symptoms of code P2128 in a Mercedes-Benz?
Symptoms may include reduced engine performance, difficulty accelerating, the vehicle entering limp mode, and the Check Engine Light turning on.
3. What causes the P2128 code to appear in a Mercedes-Benz?
Common causes include a faulty throttle or pedal position sensor, damaged wiring or connectors, corrosion in electrical components, or a malfunctioning ECM.
4. Can I drive my Mercedes-Benz with the P2128 code present?
It is not recommended to drive for long periods with this code active, as it can lead to poor performance and potential safety concerns due to limited throttle response.
5. How can I diagnose the P2128 code on my Mercedes-Benz?
Start by inspecting the throttle and pedal position sensors, checking for damaged wiring, loose connections, or corrosion. Use a multimeter to test sensor outputs and confirm the voltage readings.
6. How do I fix the P2128 code on a Mercedes-Benz?
Repairs may involve replacing the throttle or pedal position sensor, repairing damaged wiring, cleaning corroded connectors, or updating/reprogramming the ECM if necessary.
7. How much does it cost to fix the P2128 code on a Mercedes-Benz?
Repair costs vary but typically range from $150 to $500, depending on whether the issue is a sensor replacement, wiring repair, or ECM reprogramming.
8. Can a dirty throttle body cause the P2128 code on a Mercedes-Benz?
While a dirty throttle body is not a direct cause of P2128, it can contribute to other throttle-related issues. Cleaning the throttle body may help if accompanied by other maintenance.
9. Will clearing the P2128 code with an OBDII scanner fix the issue?
Clearing the code will reset the Check Engine Light temporarily, but the underlying issue must be resolved to prevent the code from returning.
10. Is the P2128 code related to other throttle or pedal position sensor codes?
Yes, P2128 may coincide with other throttle or pedal position sensor codes, such as P2122 or P2127, which also indicate issues in related circuits.
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