P0118 Subaru Code - Engine Coolant Temperature Circuit High Input
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 Subaru indicates Engine Coolant Temperature Circuit High Input.
- 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.
Code P0118 Subaru Description
What are the Possible Causes of the DTC P0118 Subaru?
- 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 Subaru?
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 Subaru 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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Frequently Asked Questions about P0118 Subaru Code
What does the OBDII code P0118 mean for a Subaru?
P0118 indicates a high input voltage from the Engine Coolant Temperature (ECT) sensor circuit, suggesting an issue with the sensor or its wiring.
What are the common symptoms of code P0118 in a Subaru?
Symptoms include poor fuel economy, difficulty starting, engine overheating, rough idling, and the check engine light being illuminated.
What causes the P0118 code on a Subaru?
Causes can include a faulty ECT sensor, damaged wiring or connectors, a short circuit, or issues with the vehicle's ECU.
Can I drive my Subaru with a P0118 code?
Driving with a P0118 code is not recommended as it can lead to engine overheating, poor performance, or further damage to the engine.
How do I fix the P0118 code on my Subaru?
Repair steps include inspecting and replacing the ECT sensor, checking and repairing wiring or connectors, and ensuring the ECU is functioning properly.
Where is the Engine Coolant Temperature sensor located in a Subaru?
The ECT sensor is usually located near the thermostat housing or in the engine block, depending on the model.
Can a bad ECT sensor affect fuel economy in a Subaru?
Yes, a faulty ECT sensor can cause incorrect temperature readings, leading to improper air-fuel mixture and reduced fuel efficiency.
What tools are needed to diagnose the P0118 code in a Subaru?
You’ll need an OBDII scanner, a multimeter for testing voltage and resistance, and basic hand tools to access the sensor and wiring.
How much does it cost to repair a P0118 code on a Subaru?
Repair costs vary but typically range from $50 to $200 for parts and labor, depending on whether just the sensor or additional components need replacement.
Can a P0118 code be triggered by low coolant levels in a Subaru?
Low coolant levels are unlikely to directly trigger a P0118 code but can cause engine overheating, which might indirectly affect the ECT sensor’s readings.
Discuss the causes and fixes for P0118 Subaru OBDII Code
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