AutoCodes – BMW – P0118 BMW

P0118 BMW Code - Engine Coolant Temperature Sensor 1 Circuit High

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: P0118 BMW indicates Engine Coolant Temperature Sensor 1 Circuit High.
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 23,592

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0118 BMW 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.

OBDII Code P0118 BMW - Engine Coolant Temperature Sensor 1 Circuit High - AutoCodes.com — P0118 BMW Code - Engine Coolant Temperature Sensor 1 Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 BMW?

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

How to Fix the DTC P0118 BMW?

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 P0118 BMW 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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Need more information on how to fix the P0118 BMW code? Get Access to Factory Service Manuals

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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 P0118 BMW Code

1. What are the common symptoms of OBDII code P0118 in a BMW?

The common symptoms of OBDII code P0118 in a BMW include engine overheating, poor fuel economy, rough idling, and the check engine light illuminating on the dashboard.

2. What does the OBDII code P0118 indicate in a BMW?

OBDII code P0118 in a BMW indicates a problem with the Engine Coolant Temperature Sensor 1 Circuit reading a high voltage signal, which can affect the engine's performance.

3. What are the possible causes of OBDII code P0118 in a BMW?

Possible causes of OBDII code P0118 in a BMW include a faulty engine coolant temperature sensor, a malfunctioning thermostat, wiring issues, or a problem with the engine control module.

4. How can I diagnose the issue related to OBDII code P0118 in my BMW?

To diagnose the issue related to OBDII code P0118 in your BMW, you can use an OBDII scanner to retrieve the code and then test the engine coolant temperature sensor, check the wiring for any damage, and inspect the thermostat for proper functioning.

5. Can driving with OBDII code P0118 in a BMW cause further damage?

Continuing to drive with OBDII code P0118 in a BMW can potentially cause damage to the engine due to incorrect temperature readings, leading to overheating and other related issues. It is recommended to address the problem promptly.

6. How can I repair OBDII code P0118 in my BMW?

To repair OBDII code P0118 in your BMW, you may need to replace the engine coolant temperature sensor, fix any wiring issues, replace a faulty thermostat, or reset the engine control module to clear the code.

7. Is it safe to reset the OBDII code P0118 in a BMW without fixing the underlying issue?

It is not recommended to simply reset the OBDII code P0118 in a BMW without fixing the underlying issue, as the problem will likely reoccur, potentially leading to engine damage and safety concerns while driving.

8. Can a DIY enthusiast fix OBDII code P0118 in a BMW?

Depending on the DIY enthusiast's skill level and access to tools, it is possible to fix OBDII code P0118 in a BMW by following proper diagnostic procedures, replacing components as needed, and clearing the code with an OBDII scanner.

9. How much does it cost to repair OBDII code P0118 in a BMW at a dealership or mechanic?

The cost to repair OBDII code P0118 in a BMW at a dealership or mechanic can vary depending on the specific issue, parts needed, labor costs, and location, but it typically ranges from $100 to $300 or more.

10. Can OBDII code P0118 in a BMW be prevented?

Regular maintenance, such as checking and replacing the engine coolant temperature sensor as recommended by the manufacturer, can help prevent OBDII code P0118 in a BMW. Additionally, addressing any cooling system issues promptly can reduce the risk of this code appearing.