P1120 2008 Toyota Prius Code - Coolant Flow Control Valve Position Sensor Circuit
Quick Answer
This system uses an electric pump to supply hot coolant stored in the 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 Flow Control Valve, Faulty Coolant Flow Control Valve Position Sensor, Coolant Flow Control Valve Position 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
- P1120 2008 Toyota Prius indicates Coolant Flow Control Valve Position Sensor Circuit.
- Common causes
- Common causes include Coolant Flow Control Valve, Faulty Coolant Flow Control Valve Position Sensor, Coolant Flow Control Valve Position 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 P1120 2008 Toyota Prius Description
The water valve for the Coolant Heat Storage (CHS) system, which is located at the heater hoses, controls the coolant passages to the engine, heater core, and the CHS tank in accordance with the operating conditions of the system.
The water valve consists of a water valve, valve position sensor, and valve control motor. The potentiometer, which is coupled coaxially to the water valve, converts the valve position into voltage and transmits it to the ECM in the form of a position signal.
What are the Possible Causes of the DTC P1120 2008 Toyota Prius?
- Coolant Flow Control Valve
- Faulty Coolant Flow Control Valve Position Sensor
- Coolant Flow Control Valve Position Sensor harness is open or shorted
- Coolant Flow Control Valve Position Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P1120 2008 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 P1120 2008 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 P1120 2008 Toyota Prius Code
1. What does the OBDII code P1120 mean in a 2008 Toyota Prius?
P1120 indicates a problem with the Coolant Flow Control Valve Position Sensor Circuit, which monitors the position of the valve that regulates engine coolant flow.
2. What are the common symptoms of P1120 in a 2008 Toyota Prius?
Symptoms include the check engine light turning on, reduced cabin heater performance, irregular engine temperature, and possible overheating.
3. What causes the P1120 code in a Toyota Prius?
Common causes include a faulty coolant flow control valve, damaged wiring or connectors in the circuit, or a malfunctioning position sensor.
4. Can P1120 cause engine damage if left unresolved?
Yes, ignoring this code can lead to improper coolant flow, potentially causing engine overheating and long-term damage.
5. How is the P1120 code diagnosed?
A technician will inspect the coolant flow control valve, check for wiring or connector issues, and use a scan tool to monitor sensor data for irregularities.
6. How do you fix the P1120 code on a 2008 Toyota Prius?
Repairs may involve replacing the coolant flow control valve, repairing or replacing damaged wiring, or cleaning corroded connectors.
7. How much does it cost to repair the P1120 code?
The repair cost varies, but replacing the coolant flow control valve typically ranges from $200 to $400, including parts and labor.
8. Can I drive my Prius with the P1120 code?
It’s not recommended, as improper coolant flow can lead to engine overheating, reduced efficiency, and potential damage.
9. Is the P1120 code covered under warranty for a 2008 Toyota Prius?
For an older vehicle like a 2008 Prius, it’s unlikely covered unless you have an extended warranty. Check with your warranty provider.
10. Can a faulty thermostat trigger the P1120 code?
No, the P1120 specifically relates to the coolant flow control valve and its position sensor, not the thermostat. However, both can impact coolant flow.
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