P1122 Lexus Code - Coolant Flow Control Valve Position Sensor Circuit Low
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
- P1122 Lexus indicates Coolant Flow Control Valve Position Sensor Circuit Low.
- 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 P1122 Lexus 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 P1122 Lexus?
- 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 P1122 Lexus?
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 P1122 Lexus 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 P1122 Lexus Code
What does the OBDII code P1122 mean on a Lexus?
1. P1122 indicates an issue with the Coolant Flow Control Valve Position Sensor Circuit, specifically that the circuit is reading a low voltage condition. 2.
What are the symptoms of the P1122 code on a Lexus?
Common symptoms include the Check Engine Light turning on, engine overheating, poor cabin heating performance, and reduced fuel efficiency. 3.
What causes the P1122 code to appear on a Lexus?
This code can be caused by a faulty coolant flow control valve, damaged wiring or connectors in the sensor circuit, or a malfunctioning position sensor. 4.
Can you still drive a Lexus with the P1122 code?
Driving with this code is not recommended, as it can lead to overheating or poor engine performance, potentially causing further damage. 5.
How do you diagnose the P1122 code on a Lexus?
Diagnosis involves checking the coolant flow control valve, inspecting the wiring and connectors for damage or corrosion, and testing the position sensor for proper function using a multimeter. 6.
How do you fix the P1122 code on a Lexus?
Repairs typically involve replacing the faulty coolant flow control valve, repairing or replacing damaged wiring, or cleaning and reconnecting corroded connectors. 7.
How much does it cost to fix the P1122 code on a Lexus?
Repair costs can range from $150 to $400, depending on whether the coolant flow control valve or wiring needs replacement. 8.
Can a dirty coolant system trigger the P1122 code on a Lexus?
Yes, a clogged or dirty coolant system can restrict flow and cause issues with the coolant flow control valve, potentially triggering this code. 9.
Does the P1122 code require reprogramming the ECU after repairs?
In most cases, ECU reprogramming is not required. However, clearing the code and verifying repairs with a scan tool is necessary. 10.
How can you prevent the P1122 code on a Lexus?
Regular coolant system maintenance, including flushing the system and inspecting the coolant flow control valve, can help prevent this issue.
Discuss the causes and fixes for P1122 Lexus OBDII Code
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