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AutoCodes - Generic - P1118

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

- Code Popularity: 31,639 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1118?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Low engine coolant level
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • Faulty engine coolant thermostat
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How to Fix the DTC P1118?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1118 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1118 Description

The Engine Coolant Temperature (ECT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). The ECT sensor mounts in the left bank cylinder head near the front of the engine. The ECT sensor has a signal circuit and a ground circuit. The PCM applies a voltage (about 5.0 volts) on the signal circuit to the sensor. The PCM monitors changes in this voltage caused by changes in the resistance of the sensor in order to determine the engine coolant temperature.
When the engine coolant is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the engine coolant is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).
OBDII Code P1118 - Engine Coolant Temp Signal Out-Of Range High - AutoCodes.com
P1118 Code - Engine Coolant Temp Signal Out-Of Range High

Need More Information on the Code?

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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

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