AutoCodes – Mercedes-Benz – P0116 Mercedes-Benz

P0116 Mercedes-Benz Code - Engine Coolant Temperature Circuit Range/Performance Problem

Quick Answer

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat. 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: P0116 Mercedes-Benz indicates Engine Coolant Temperature Circuit Range/Performance Problem.
Common causes: Common causes include Low engine coolant level, Faulty Engine Coolant Temperature (ECT) sensor, Faulty engine coolant thermostat.
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 24,576

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 07, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0116 Mercedes-Benz Description

The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. The Diagnostic Trouble Code (DTC) will be set when the coolant temperature signal sent to the ECM is not within the specified range.

OBDII Code P0116 Mercedes-Benz - Engine Coolant Temperature Circuit Range/Performance Problem - AutoCodes.com — P0116 Mercedes-Benz Code - Engine Coolant Temperature Circuit Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P0116 Mercedes-Benz?

Low engine coolant level
Faulty Engine Coolant Temperature (ECT) sensor
Faulty engine coolant thermostat
Engine Coolant Temperature sensor harness is open or shorted
Engine Coolant Temperature sensor circuit poor electrical connection

How to Fix the DTC P0116 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 P0116 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 P0116 Mercedes-Benz code?

Need more information on how to fix the P0116 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 P0116 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0116 in a Mercedes-Benz?

The common symptoms of code P0116 in a Mercedes-Benz include engine overheating, poor fuel economy, rough idling, and a possible decrease in engine performance.

2. What could cause the OBDII code P0116 in a Mercedes-Benz?

The code P0116 in a Mercedes-Benz is often caused by a faulty engine coolant temperature sensor, a problem with the wiring or connector related to the sensor, or issues with the engine's cooling system.

3. How can I diagnose the OBDII code P0116 in my Mercedes-Benz?

To diagnose the code P0116, you can use an OBDII scanner to read the fault code, visually inspect the coolant temperature sensor and its wiring, check the coolant level and condition, and perform a resistance test on the sensor.

4. What are some repair tips for fixing OBDII code P0116 in a Mercedes-Benz?

Repair tips for addressing code P0116 in a Mercedes-Benz include replacing the engine coolant temperature sensor, repairing any damaged wiring or connectors, ensuring the cooling system is functioning correctly, and clearing the fault code after making repairs.

5. Can I continue driving my Mercedes-Benz with OBDII code P0116?

It is not recommended to drive your Mercedes-Benz with code P0116 as it can lead to engine damage due to overheating or other related issues. It's best to address the problem promptly to prevent further damage.

6. Will resetting the OBDII code P0116 in my Mercedes-Benz solve the issue?

Resetting the code P0116 may temporarily turn off the check engine light, but it will not fix the underlying problem causing the code. It's essential to diagnose and repair the issue to prevent future occurrences.

7. How much does it typically cost to repair OBDII code P0116 in a Mercedes-Benz?

The cost of repairing code P0116 in a Mercedes-Benz can vary depending on the cause of the issue, the parts needed for repair, and labor costs. It's recommended to consult with a mechanic or dealership for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P0116 in a Mercedes-Benz?

If you have the necessary tools, knowledge, and experience working on automotive systems, you may be able to fix code P0116 in your Mercedes-Benz yourself. However, if you're unsure, it's best to seek professional help.

9. How urgent is it to address OBDII code P0116 in a Mercedes-Benz?

It is essential to address code P0116 promptly in a Mercedes-Benz to prevent potential engine damage, overheating issues, and further complications with the vehicle's performance and fuel efficiency.

10. Are there any preventative measures to avoid OBDII code P0116 in a Mercedes-Benz?

Regular maintenance of the cooling system, checking the coolant level and condition, and addressing any engine overheating issues promptly can help prevent OBDII code P0116 from occurring in your Mercedes-Benz.