Overheating and code P0366

SARA LANO

MEMBER
2007 GMC ACADIA
6 CYL
4WD
AUTOMATIC
173,000 MILES

I have the vehicle listed above SLT model. My car wants to overheat when I go on the freeway or up any hills. Feels sluggish. I took it to Bucky's, I was told I need a new water pump, thermostat, and have an engine code P0366. Of course, they want more than I can afford. So, I am trying to see what this code means and if it’s something I can try to do. I do know I also need new spark plugs as well.

Wednesday, May 11th, 2022 AT 2:43 PM

2 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

Does it only overheat when you are on the highway?
What happens when you are around town?

An engine can overheat due to a number of reasons including a faulty water pump, stuck closed thermostat, inoperative cooling fans, bad radiator etc.
One thing to keep in mind, if it is the thermostat, it will overheat regardless of highway or in town driving. It will overheat simply by starting the engine for a period of time.

The code P0366 Exhaust Camshaft Position (CMP) Sensor Performance Bank 1
This is likely not related to the overheating.
I have attached the trouble shooting guide for the code P0366 below.

Take a look at this helpful guide, it covers the typical overheating issues and diagnostics:

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Let me know of any questions.

Thank you.

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Thursday, May 12th, 2022 AT 10:08 AM

KEN L

MASTER CERTIFIED MECHANIC
50,088 POSTS

The P0366 code is the camshaft position sensor B is not working which can make the engine run sluggish as you have described. When the engine is heating up can you hear the fan running? You could have a cooling fan relay not working. I have attached some diagrams below, also is the car full of coolant? only check when the car is cold. This guide can help as well:

https://www.2carpros.com/articles/engine-overheating-or-running-hot

As far as the code P0366 here is the sensor location sensor bank1 position 2 (exhaust) so you can change it out and then clear the codes. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.