P1123 Toyota Code - Coolant Flow Control Valve Position Sensor Circuit High
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
- P1123 Toyota indicates Coolant Flow Control Valve Position Sensor Circuit High.
- 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 P1123 Toyota 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 P1123 Toyota?
- 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 P1123 Toyota?
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 P1123 Toyota 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 P1123 Toyota code?
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Information for Specific Toyota Models
- P1123 2004 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
- P1123 2005 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
- P1123 2006 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
- P1123 2007 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
- P1123 2008 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
- P1123 2009 Toyota Prius — Coolant Flow Control Valve Position Sensor Circuit High
Frequently Asked Questions about P1123 Toyota Code
1. What are the common symptoms of OBDII code P1123 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High?
The common symptoms include engine overheating, poor fuel economy, rough idling, and potential stalling of the vehicle.
2. What are the possible causes of OBDII code P1123 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High?
The main causes could be a faulty coolant flow control valve, a malfunctioning position sensor, wiring issues, or a problem with the engine control module (ECM).
3. How can I diagnose the issue causing OBDII code P1123 in my Toyota?
You can use a diagnostic scanner to read the code and further investigate the coolant flow control valve, position sensor, and associated wiring for any visible signs of damage or malfunction.
4. Is it safe to continue driving my Toyota with the OBDII code P1123 related to the Coolant Flow Control Valve Position Sensor Circuit High?
It is not recommended to drive the vehicle with this code as it can lead to engine overheating and potential damage. It's best to address the issue promptly.
5. Can I repair OBDII code P1123 in my Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High myself?
If you have experience with automotive repairs and access to the necessary tools, you may be able to replace the faulty components yourself. Otherwise, it's advisable to seek professional help.
6. Are there any preventive measures to avoid OBDII code P1123 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High?
Regular maintenance, including checking coolant levels, inspecting the cooling system, and addressing any issues promptly, can help prevent this code from appearing.
7. How much does it typically cost to repair OBDII code P1123 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High?
The cost of repairs can vary depending on the extent of the issue, the need for replacement parts, and labor charges. It's recommended to get a quote from a trusted mechanic.
8. Can a faulty Coolant Flow Control Valve Position Sensor impact the overall performance of my Toyota?
Yes, a malfunctioning sensor can affect the engine's performance, fuel efficiency, and overall drivability of the vehicle. It's essential to address this issue promptly.
9. Will resetting the OBDII system clear the P1123 code in my Toyota?
Resetting the system may temporarily clear the code, but if the underlying issue causing the code is not fixed, it is likely to reappear. It's crucial to diagnose and repair the problem.
10. How long does it take to repair OBDII code P1123 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit High?
The repair time can vary depending on the exact cause of the issue and the complexity of the repairs needed. It's advisable to consult with a mechanic for a more accurate estimate.
Discuss the causes and fixes for P1123 Toyota OBDII Code
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I have no symptoms other than the code.....and also p1121.... we will get to the bottom of this.
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Let me check if I can find more information. What model and year is your Toyota?
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According to a national database of repairs, the most like cause of the problem is the the Hybrid Coolant Flow Control Valve. Also, before you replace any parts, make sure there are no coolant leaks.
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