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Engine-Codes – Generic – P1118

P1118 Code - Engine Coolant Temp Signal Out-Of Range High

Quick Answer

The diagnostic trouble code P1118 indicates that the engine coolant temperature signal is out of range high. Common causes include Faulty coolant temperature sensor, Wiring or connector issues in the coolant temperature sensor circuit, Low coolant level. 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
P1118 indicates Engine Coolant Temp Signal Out-Of Range High.
Common causes
Common causes include Faulty coolant temperature sensor, Wiring or connector issues in the coolant temperature sensor circuit, Low coolant level.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1118 Description

The diagnostic trouble code P1118 indicates that the engine coolant temperature signal is out of range high. This means that the Engine Control Module (ECM) has detected a reading from the coolant temperature sensor that is higher than the normal operating range. The coolant temperature sensor is a crucial component that monitors the temperature of the engine coolant and provides this information to the ECM to help regulate fuel mixture, ignition timing, and other engine functions. When the coolant temperature signal is out of range high, it can lead to poor engine performance, reduced fuel efficiency, and potential engine overheating if not addressed promptly.

OBDII Code P1118 - Engine Coolant Temp Signal Out-Of Range High
P1118 Code - Engine Coolant Temp Signal Out-Of Range High

Common Causes of P1118

  1. Faulty coolant temperature sensor
  2. Wiring or connector issues in the coolant temperature sensor circuit
  3. Low coolant level
  4. Thermostat stuck closed
  5. ECM malfunction

Symptoms of P1118

  1. Engine overheating
  2. Poor fuel efficiency
  3. Check engine light illuminated
  4. Rough idling or stalling
  5. Reduced engine power

How to Fix P1118

  1. Begin by checking the coolant level and ensuring it is at the proper level.
  2. Inspect the coolant temperature sensor and its wiring for any damage or corrosion. Replace the sensor if necessary.
  3. Test the thermostat to ensure it is functioning correctly. Replace if stuck closed.
  4. Clear the diagnostic trouble codes using a scan tool and monitor the coolant temperature readings to ensure they are within the normal range.
  5. If the issue persists, further diagnostics may be required to identify any underlying problems with the ECM or other components.

Cost to Fix P1118

The cost of repairing a P1118 engine coolant temperature signal out-of-range high code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty coolant temperature sensor can range from $50 to $200, including parts and labor. However, if additional repairs or diagnostics are needed, the total cost could increase. It's recommended to consult with a qualified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model, as well as local labor rates.

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Code P1118 Information for Specific Makes

  • P1118 Audi — HO2S Sensor Heater Circuit Open Bank 1 Sensor 2
  • P1118 BMW — Mass Or Volume Air Flow Circuit High Input Bank 2
  • P1118 Buick — Engine Coolant Temp Signal Out-Of Range High
  • P1118 Cadillac — Engine Coolant Temp Signal Out-Of Range High
  • P1118 Chevrolet — Engine Coolant Temp. Signal Out-Of-Range High
  • P1118 Ford — Manifold Absolute Temperature Circuit Low Input
  • P1118 GMC — Engine Coolant Temp. Signal Out-Of-Range High
  • P1118 Hyundai — Electronic Throttle System Motor Malfunction
  • P1118 Land Rover — Thermostat Monitoring Sensor Open Circuit Or Short Circuit To Battery
  • P1118 Lexus — Coolant Temperature Sensor Circuit High for Coolant Heat Storage System
  • P1118 MINI — Mass Or Volume Air Flow Circuit High Input Bank 2
  • P1118 Scion — Coolant Temperature Sensor Circuit High for Coolant Heat Storage System
  • P1118 Toyota — Coolant Temperature Sensor Circuit High for Coolant Heat Storage System
  • P1118 Volkswagen — HO2S Sensor Heater Circuit Open Bank 1 Sensor 2
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.

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