AutoCodes – Mercedes-Benz – P0725 Mercedes-Benz

P0725 Mercedes-Benz Code - Engine Speed Sensor Input Circuit Malfunction

Quick Answer

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM). Common causes include Fualty Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) 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: P0725 Mercedes-Benz indicates Engine Speed Sensor Input Circuit Malfunction.
Common causes: Common causes include Fualty Crankshaft Position (CKP) Sensor, Crankshaft Position (CKP) Sensor harness is open or shorted, Crankshaft Position (CKP) 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 7,925

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0725 Mercedes-Benz Description

The Engine Control Module (ECM) monitors the engine speed through the Crankshaft Position (CKP) sensor with the engine running, and send signal to the Transmission Control Module (TCM).

OBDII Code P0725 Mercedes-Benz - Engine Speed Sensor Input Circuit Malfunction - AutoCodes.com — P0725 Mercedes-Benz Code - Engine Speed Sensor Input Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0725 Mercedes-Benz?

Fualty Crankshaft Position (CKP) Sensor
Crankshaft Position (CKP) Sensor harness is open or shorted
Crankshaft Position (CKP) Sensor circuit poor electrical connection
Communication error between the Engine Control Module (ECM) and Transmission Control Module (TCM)

How to Fix the DTC P0725 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0725 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.

Need more information about the P0725 Mercedes-Benz code?

Need more information on how to fix the P0725 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0725 Mercedes-Benz Code

1. What does the OBDII code P0725 mean on a Mercedes-Benz?

P0725 indicates an "Engine Speed Sensor Input Circuit Malfunction," meaning the vehicle's powertrain control module (PCM) is not receiving a proper signal from the engine speed sensor.

2. What are the common symptoms of a P0725 code on a Mercedes-Benz?

Symptoms may include a check engine light, transmission shifting issues, poor acceleration, engine stalling, or the vehicle entering limp mode.

3. What causes the P0725 code to appear on a Mercedes-Benz?

Common causes include a faulty engine speed sensor, damaged wiring or connectors, a malfunctioning PCM, or issues with the transmission control module (TCM).

4. Can I drive my Mercedes-Benz with a P0725 code?

Driving with a P0725 code is not recommended, as it can lead to transmission problems, reduced performance, and potential safety hazards.

5. How do I diagnose the P0725 code on my Mercedes-Benz?

Diagnosis involves scanning for additional codes, inspecting the engine speed sensor and its wiring, checking the PCM and TCM for faults, and testing the sensor's signal with a multimeter.

6. How do I fix the P0725 code on a Mercedes-Benz?

Repairs may include replacing the engine speed sensor, repairing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the PCM or TCM.

7. Where is the engine speed sensor located on a Mercedes-Benz?

The engine speed sensor is typically located on the bell housing of the transmission or near the crankshaft, depending on the vehicle model.

8. What tools are needed to fix a P0725 code on a Mercedes-Benz?

Common tools include an OBDII scanner, a multimeter, basic hand tools, and possibly software for PCM/TCM reprogramming.

9. Will clearing the P0725 code fix the issue on my Mercedes-Benz?

Clearing the code without addressing the underlying issue will likely result in the code returning, as the root cause still exists.

10. How much does it cost to repair a P0725 code on a Mercedes-Benz?

Repair costs vary depending on the issue but can range from $100-$300 for sensor replacement to $500-$1,000 or more if PCM or TCM replacement is required.