AutoCodes – Mercedes-Benz – P2135 Mercedes-Benz

P2135 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

Quick Answer

This fault code is stored in the engine control module 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: P2135 Mercedes-Benz indicates Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation.
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.

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Code Popularity 12,313

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 09, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2135 Mercedes-Benz Description

This fault code is stored in the engine control module when a fault is detected with the circuit monitoring throttle and accelerator pedal position. Both circuits are closely monitored for plausibility checks. The ECM can easily identify erroneous data by monitoring both circuits for an inconsistency between the throttle position sensor voltage and the accelerator pedal position sensor voltage. Normally potentiometers are used for both sensor circuits, however some manufacturers may use a hall effect sensor with a varying frequency depending on position. Another feature of modern vehicles is using multiple sensors for redundancy and fault analysis. This is where a technician would see data for accelerator pedal position sensor 1 and 2 or throttle position sensor 1 and 2. The voltages from these components can be inversely proportional or a stepped waveform with only output half the output of the other.

OBDII Code P2135 Mercedes-Benz - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation - AutoCodes.com — P2135 Mercedes-Benz Code - Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation

What does this mean?

What are the Possible Causes of the DTC P2135 Mercedes-Benz?

Faulty Accelerator Pedal Position Sensor
Accelerator Pedal Position Sensor harness is open or shorted
Accelerator Pedal Position Sensor circuit poor electrical connection
Faulty Throttle Position Sensor (TPS)
Faulty Engine Control Module (ECM)

How to Fix the DTC P2135 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.

What does this mean?

Code Tech Notes

Mercedes Benz Code = 0160 (Throttle valve actuator): Actual value potentiometer 1 or 2 has failed. (P2135)
Mercedes Benz Code = 0164 (Throttle valve actuator): There is a comparison error between actual value potentiometers 1 and 2. (P2135)
Mercedes Benz Code = 0168 (Throttle valve actuator): There is a comparison error between actual value potentiometers 2 and 1. (P2135)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2135 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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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 P2135 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P2135 in a Mercedes-Benz related to the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation?

Symptoms may include reduced engine power, stalling, hesitation, rough idling, and potential issues with acceleration.

2. What are the possible causes of OBDII code P2135 in a Mercedes-Benz?

Potential causes include a faulty throttle position sensor, pedal position sensor malfunction, damaged wiring or connectors, or a problem with the electronic control module.

3. How can I diagnose the Throttle/Pedal Position Sensor/Switch 'A'/'B' Voltage Correlation issue in my Mercedes-Benz?

Diagnosis typically involves using a diagnostic scanner to read the specific fault code, testing the throttle and pedal position sensors for proper voltage output, and inspecting the wiring for any signs of damage or corrosion.

4. Can I continue driving my Mercedes-Benz with OBDII code P2135 present?

It is not recommended to continue driving with this code active, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

5. What are some repair tips for fixing OBDII code P2135 in a Mercedes-Benz?

Repair tips may include replacing the faulty throttle or pedal position sensor, repairing damaged wiring or connectors, resetting the electronic control module, and ensuring proper calibration of the sensors.

6. Is it possible to reset OBDII code P2135 in a Mercedes-Benz without making any repairs?

While clearing the code may temporarily turn off the check engine light, it will not fix the underlying issue causing the fault code to trigger. It's important to address the root cause of the problem.

7. How much does it typically cost to repair OBDII code P2135 in a Mercedes-Benz at a dealership or repair shop?

Costs can vary depending on the exact cause of the issue and the labor rates of the service provider. Repairs may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix OBDII code P2135 in a Mercedes-Benz?

Depending on the skill level and experience of the individual, some DIY enthusiasts may be able to address this issue themselves by following repair guides, using diagnostic tools, and having the necessary parts and tools.

9. Will OBDII code P2135 affect the overall performance and fuel efficiency of my Mercedes-Benz?

Yes, this code can impact the performance of the vehicle, causing issues with acceleration, power delivery, and potentially affecting fuel efficiency. Resolving the problem promptly can help restore optimal performance.

10. How can I prevent OBDII code P2135 from occurring in my Mercedes-Benz in the future?

Regular maintenance, including inspecting and cleaning throttle and pedal position sensors, checking wiring for damage, and addressing any warning signs promptly, can help prevent this code from appearing in the future.