P1117 2004 Toyota Prius Code - Coolant Temperature Sensor Circuit Stack 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
- P1117 2004 Toyota Prius indicates Coolant Temperature Sensor Circuit Stack 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 P1117 2004 Toyota Prius Description
What are the Possible Causes of the DTC P1117 2004 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 P1117 2004 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 P1117 2004 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.
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Frequently Asked Questions about P1117 2004 Toyota Prius Code
1. What does the OBDII code P1117 mean on a 2004 Toyota Prius?
P1117 indicates an issue with the coolant temperature sensor circuit for the Coolant Heat Storage (CHS) system, potentially due to a malfunctioning sensor or wiring problem.
2. What are the symptoms of code P1117 in a 2004 Toyota Prius?
Common symptoms include the Check Engine Light turning on, poor fuel efficiency, difficulty maintaining optimal engine temperature, or the CHS system not functioning correctly.
3. What causes the P1117 code in a Toyota Prius?
Possible causes include a faulty coolant temperature sensor, damaged or corroded wiring, a loose or disconnected electrical connector, or an issue with the CHS ECU.
4. Can I drive my 2004 Toyota Prius with the P1117 code?
While the vehicle may still be drivable, prolonged use with this code can lead to reduced performance, fuel efficiency issues, and potential long-term damage to the CHS system.
5. How can I diagnose the P1117 code on a 2004 Toyota Prius?
Use an OBDII scanner to confirm the code, then inspect the CHS coolant temperature sensor, wiring harness, and connectors for damage or corrosion. Test the sensor with a multimeter if necessary.
6. How do you fix the P1117 code in a Toyota Prius?
Repairs may include replacing the faulty coolant temperature sensor, repairing or replacing damaged wiring, and ensuring all connectors are securely attached and free of corrosion.
7. Where is the coolant temperature sensor for the CHS system located on a 2004 Toyota Prius?
The coolant temperature sensor for the CHS system is typically located near the Coolant Heat Storage tank and connected to its associated wiring harness.
8. How much does it cost to fix a P1117 code on a Toyota Prius?
The cost can vary, but replacing the coolant temperature sensor typically costs between $50 and $150 for parts, plus labor if done by a mechanic.
9. Can a faulty thermostat cause the P1117 code in a Toyota Prius?
A faulty thermostat is unlikely to directly cause this code, as P1117 specifically relates to the CHS coolant temperature sensor circuit.
10. Will clearing the P1117 code fix the issue permanently?
Clearing the code without addressing the root cause will only temporarily turn off the Check Engine Light. The code will likely return until the underlying issue is resolved.
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