P0118 Scion Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The P0118 Scion code indicates that there is a high input signal from the engine coolant temperature (ECT) sensor circuit. Common causes include Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning engine coolant temperature sensor, Damaged Sensor Wiring: Damage to the wiring harness connected to the ECT sensor can cause high input signals, Corroded Connector: Corrosion in the electrical connector can lead to poor connections and incorrect temperature readings. 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 Scion indicates Engine Coolant Temperature Circuit High Input.
- Common causes
- Common causes include Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning engine coolant temperature sensor, Damaged Sensor Wiring: Damage to the wiring harness connected to the ECT sensor can cause high input signals, Corroded Connector: Corrosion in the electrical connector can lead to poor connections and incorrect temperature readings.
- 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 P0118 Scion Description
The P0118 Scion code indicates that there is a high input signal from the engine coolant temperature (ECT) sensor circuit. This sensor is responsible for measuring the temperature of the engine coolant and sending this information to the engine control module (ECM). The ECM uses this data to adjust fuel delivery and ignition timing for optimal engine performance.
Common Causes of P0118 Scion
- Faulty ECT Sensor: The most common cause of the P0118 code is a malfunctioning engine coolant temperature sensor.
- Damaged Sensor Wiring: Damage to the wiring harness connected to the ECT sensor can cause high input signals.
- Corroded Connector: Corrosion in the electrical connector can lead to poor connections and incorrect temperature readings.
- ECM Malfunction: In rare cases, a malfunctioning engine control module can cause erroneous high input signals from the ECT sensor.
Symptoms of P0118 Scion
- Check Engine Light: The most common symptom associated with the P0118 code is the illumination of the check engine light on the dashboard.
- Engine Overheating: If the ECT sensor is reporting incorrect high temperatures, the engine may actually be overheating, leading to potential damage.
- Poor Fuel Economy: Incorrect engine coolant temperature readings can cause the engine to run rich or lean, resulting in decreased fuel efficiency.
- Rough Idling: The ECM may adjust fuel delivery based on the faulty temperature readings, causing the engine to idle roughly.
- Engine Stalling: In severe cases, the engine may stall due to incorrect fuel delivery and timing adjustments.
How to Fix P0118 Scion
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the ECT sensor, wiring, and connectors.
- Replace ECT Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's recommendations.
- Check Wiring Harness: Inspect the wiring harness for any damage or corrosion, repairing or replacing as necessary.
- Clean Connector: Clean the electrical connector to ensure a proper connection and clear any corrosion that may be present.
- Clear Codes: After completing the repairs, clear the trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0118 Scion
The typical repair costs for addressing a P0118 code can vary depending on the specific cause of the issue. In general, the cost of replacing an engine coolant temperature sensor ranges from $50 to $150, while the labor for diagnosis and repair can add another $100 to $200. Overall, the total cost for resolving a P0118 code can range from $150 to $350, including parts and labor. Keep in mind that these estimates are general guidelines and actual costs may vary based on location, vehicle make and model, and the specific repairs needed. It is recommended to consult with a certified mechanic for a more accurate cost estimate.
Tech Notes for P0118 Scion
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Information for Specific Scion Models
- P0118 2005 Scion xB — Engine Coolant Temperature Circuit High Input
- P0118 2006 Scion xB — Engine Coolant Temperature Circuit High Input
- P0118 2007 Scion xB — Engine Coolant Temperature Circuit High Input
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