P1118 Code - Engine Coolant Temp Signal Out-Of Range High
Quick Answer
The Engine Coolant Temperature (ECT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Low engine coolant level, Engine Coolant Temperature (ECT) sensor harness is open or shorted. 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 Engine Coolant Temperature (ECT) sensor, Low engine coolant level, Engine Coolant Temperature (ECT) sensor harness is open or shorted.
- 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.
Code P1118 Description
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).
What are the Possible Causes of the DTC P1118?
- 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
How to Fix the DTC P1118?
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 P1118 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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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
Frequently Asked Questions about P1118 Code
No Frequently Asked Questions about P1118 Code found.
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