AutoCodes – RAM – P0118 RAM

P0118 RAM Code - Engine Coolant Temperature Sensor 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 RAM indicates Engine Coolant Temperature Sensor 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 1,619

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 Aug 02, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0118 RAM 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 RAM - Engine Coolant Temperature Sensor Circuit High - AutoCodes.com — P0118 RAM Code - Engine Coolant Temperature Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P0118 RAM?

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 RAM?

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 RAM 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 P0118 RAM Code

1. What are the common symptoms of OBDII code P0118 RAM?

- Common symptoms include engine overheating, rough idling, poor fuel economy, and the Check Engine light illuminating.

2. What causes the OBDII code P0118 RAM to trigger?

- The code is triggered when the Engine Coolant Temperature Sensor circuit reports a high voltage, indicating a potential issue with the sensor or its wiring.

3. How can I diagnose the cause of code P0118 RAM?

- To diagnose the issue, you can use a multimeter to test the resistance of the Engine Coolant Temperature Sensor and check the wiring for any damage or loose connections.

4. Can a faulty thermostat cause the OBDII code P0118 RAM?

- Yes, a faulty thermostat can sometimes cause the engine coolant temperature to read incorrectly, triggering the P0118 RAM code.

5. What are some repair tips for addressing code P0118 RAM?

- Repair tips include checking and possibly replacing the Engine Coolant Temperature Sensor, inspecting the sensor's wiring for any issues, and ensuring the cooling system is working properly.

6. Is it safe to continue driving with OBDII code P0118 RAM present?

- It is not recommended to continue driving with the code present, as it can lead to potential engine damage due to incorrect temperature readings.

7. Can a dirty or low coolant level trigger the P0118 RAM code?

- Yes, a low coolant level or dirty coolant can affect the temperature sensor readings and potentially trigger the P0118 RAM code.

8. How much does it typically cost to repair OBDII code P0118 RAM?

- The cost of repair can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will resetting the Check Engine light resolve the P0118 RAM code?

- Resetting the Check Engine light may temporarily turn it off, but if the underlying issue causing the P0118 RAM code is not addressed, the light will likely come back on.

10. Can a mechanic clear the P0118 RAM code without fixing the issue?

- Yes, a mechanic can clear the code, but it is important to address the underlying issue causing the P0118 RAM code to prevent further problems with the vehicle.