Skip the auto shop - Our mechanics make house calls

Q: Coolant flow control valve and camshaft position

asked by on

My car has a metallic noise when I accelerate, auto zone diagnosed on check engine light, the coolant flow control valve position sensor circuit stuck also camshaft position- timing over retarded. How serious is this?

My car has 184341 miles.
My car has an automatic transmission.

A: A camshaft position sensor is a sensor that...

A camshaft position sensor is a sensor that monitors camshaft speed to regulate ignition timing and fuel injection timing. This is a small sensor that is usually easily replaced and fairly inexpensive. The coolant control valve 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. This valve can become stuck and the computer will recognize this as an incorrect coolant flow which triggers this code and your check engine light. A YourMechanic certified technician can come to your location to perform a Check Engine Light is on Inspection on your vehicle or help you with a camshaft position sensor replacement.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine shudders when not moving, check engine light on - 2003 Toyota Echo 1.5 L 4-cylinder

ANY time a Check Engine Light comes on, the first thing you need to do is get the computer scanned. Autozone or advance will actually do this for free so you don't have to purchase anything. Shuddering could be a...

Q: 2005 Toyota Prius won't turn off

The symptoms you describe for your Toyota Prius lead me to believe you have a bad ground in your electrical system. A bad ground connection can create all kinds of electrical problems, as it prevents adequate voltage from reaching the...

Q: losing fuel pressure when it warms up

Hi there. This can be a very difficult item to diagnose. In some cases, the lack of fuel pressure is caused by a restriction of fuel in the system; from the pump itself to all lines or the carburetor. It...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...