P1118 2009 Toyota Prius Code - Coolant Temperature Sensor Circuit High for Coolant Heat Storage System
Quick Answer
This system uses an electric pump to supply hot coolant stored in the coolant heat storage tank into the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of unburned gas that is discharged while the engine is started. Common causes include Coolant Heat Storage Tank, Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage), Low engine 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 2009 Toyota Prius indicates Coolant Temperature Sensor Circuit High for Coolant Heat Storage System.
- Common causes
- Common causes include Coolant Heat Storage Tank, Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage), Low engine 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.
Code P1118 2009 Toyota Prius Description
What are the Possible Causes of the DTC P1118 2009 Toyota Prius?
- Coolant Heat Storage Tank
- Faulty Engine Coolant Temperature (ECT) sensor for CHS (Coolant Heat Storage)
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor for HST harness is open or shorted
- Engine Coolant Temperature (ECT) sensor for HST electrical circuit poor connection
- Faulty engine coolant thermostat
How to Fix the DTC P1118 2009 Toyota Prius?
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 2009 Toyota Prius 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.
Need more information about the P1118 2009 Toyota Prius code?
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Frequently Asked Questions about P1118 2009 Toyota Prius Code
1. What are the common symptoms of OBDII code P1118 on a 2009 Toyota Prius?
Symptoms may include the engine running hotter than normal, a check engine light illuminated on the dashboard, and potential issues with the vehicle's cooling system.
2. What does the OBDII code P1118 indicate for a 2009 Toyota Prius?
P1118 signifies a problem with the Coolant Temperature Sensor Circuit High for the Coolant Heat Storage System in the vehicle.
3. What are some possible causes of the P1118 code on a 2009 Toyota Prius?
Potential causes include a faulty coolant temperature sensor, a malfunctioning coolant heat storage pump, wiring issues, or a problem with the engine control module (ECM).
4. How can I diagnose the P1118 code on my 2009 Toyota Prius?
Diagnosis typically involves using a scan tool to read the code, inspecting the coolant temperature sensor and its wiring, checking the coolant heat storage pump, and testing the ECM.
5. Can I continue driving my 2009 Toyota Prius with the P1118 code?
It is not recommended to drive the vehicle with the P1118 code present, as it may lead to overheating and potential damage to the engine.
6. How can I repair the Coolant Temperature Sensor Circuit High issue on my 2009 Toyota Prius?
Repairing the issue may involve replacing the faulty coolant temperature sensor, repairing any damaged wiring, checking and potentially replacing the coolant heat storage pump, or reprogramming the ECM.
7. Is it possible to reset the P1118 code on a 2009 Toyota Prius without repairing the underlying issue?
While you can clear the code with a scan tool, it is crucial to address the root cause of the problem to prevent it from recurring and potentially causing further damage to the vehicle.
8. How much does it typically cost to fix the P1118 code on a 2009 Toyota Prius?
The cost of repairs can vary depending on the specific cause of the issue, but it may range from around $100 to $500 or more, including parts and labor.
9. Can a DIY enthusiast fix the P1118 code on a 2009 Toyota Prius?
Depending on your experience and access to tools, you may be able to address some aspects of the issue yourself, such as checking and replacing the coolant temperature sensor. However, more complex repairs may require professional assistance.
10. How often does the P1118 code occur in a 2009 Toyota Prius?
While the P1118 code is not extremely common, it can still occur due to various factors affecting the coolant temperature sensor circuit in the Coolant Heat Storage System of the 2009 Toyota Prius.
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