Skip the auto shop - Our mechanics make house calls

Q: Coolant control valve malfunction

asked by on

The Check Engine light was on. I went to the dealer, and they said I need to replace the coolant control valve malfunction.

A: The coolant control valve on your Toyota Pr...

The coolant control valve on your Toyota Prius controls the flow of coolant in and out of the coolant storage tank. By diverting coolant into the storage tank, it can keep the coolant heated in order to keep the engine at operating temperature, allowing it can run more efficiently as well as allow the use of the heater even when the engine is not running. This valve can become stuck over time and the computer recognizes that there is incorrect coolant flow. When this happens, a Check Engine Light will illuminate and open the OBD code P1122. This is a pretty straight forward repair, so I would recommend enlisting the assistance of a certified mechanic to come by verify this concern and make the necessary repairs to get your cooling system 100% operational again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: My cooling fans aren't working properly I think ...P

The cooling fans work according to relays that detect temperature and cause them to turn off and on. When these relays are not working properly, this will cause them to come on all the time, not at all or intermittently....

Q: Check engine, VSC, and the red triangle and another light is on

While the car may be safe to drive, I would not recommend driving it with these codes on as many of these can cause a chain reaction of issues when one component is failing. I suggest having a local expert,...

Q: Car won't start; get error code P0340

Let us first start by discussing the OBD code P0340, which indicates a problem with the camshaft sensor in the Celica. On your particular Toyota, the camshaft position sensor is built into the distributor, therefore you are correct to think...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...