Check engine light....coolant temperature sensor on a 2005 gmc envoy where is it located...how to change it

This appears to be a follow up of a question I answered earlier. Posting follow ups here doesn't work because each question has no context the the others. You must have deleted the earlier one or you posted anonymously.

According to this, only the 2002 model had an oil temperature sensor.

https://www.google.com/search?q=2005+gmc+envoy+oil+temperature+sensor+location

Your best bet would be to download a manual so you are sure what this gauge ACTUALLY is. HERE it is

https://www.manualslib.com/manual/61408/Gmc-2005-Gmc-Envoy.html?page=167#manual

Top row: Oil Pressure - Battery Volts
Bottom row: Fuel Tank Level - Coolant Temperature

..

scan the ECT if it reads wrong most time the 17 year old thermostat is bad. stuck open, missing or those crazy fail safe stat gone wild.
ect 180 to 200f is normal .
if not thermostat is first. I used and IR gun to measure the stat hosing to see if its bad, 1minutes work,
most times the gauge never fails so we do 1simple test to prove that.
scan the PCM is first.

never seen a STaT good 17 year old,
had one that told near all day to hit 180f>?
when old that do nasty things, even stick closed and warp HEADS
why risk that, attack the stat.

on top of motor in front by where radiator hose is.

Hi there:
The Coolant Temperature Sensor location on 2000-2005 4.8L, 5.3L, 6.0L engines is in the head driver side, above the plug.



Additionally, this video also could help you...



Hope helps.

if you have a code for erratic thermostatic or coolant temp ,change the thermostat it is a known problem ...located under the alternater very hard to change make sure you get an acdelco or dealer part ;) assuming it is the in line engine

This code relates to low coolant temperature not the 02 sensors. You should change your thermostat, it's stuck open and is not allowing the engine to properly heat up.

By the way, there are 2 92 sensors on Envoys and Trailblazers. One of them upstream is in the engine compartment right off the exhaust manifold, easy to replace. The other one downstream is next to the transmission drain plug in the exhaust pipe.

4.2L Engine To Remove:

1. Disconnect the negative battery cable from the battery.
2. Drain the coolant from the engine.
3. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation
   
   
4. Remove the engine coolant temperature (ECT) sensor from the engine.

To Install:

1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
2. Install the engine coolant temperature (ECT) sensor into the engine. Torque the sensor to 12 ft-lb (16 Nm).
3. Connect the engine coolant temperature (ECT) sensor connector.
4. Refill the engine with coolant.
5. Connect the negative battery cable to the battery.

5.3L & 6.0L Engines To Remove:

1. Drain the coolant from the engine.
2. Disconnect the engine coolant temperature (ECT) sensor connector. Engine coolant temperature sensor removal and installation
   
   
3. Remove the engine coolant temperature (ECT) sensor from the left cylinder head.

To Install:

1. Apply thread sealer P/N 12346004 or equivalent to the engine coolant temperature (ECT) sensor threads.
2. Install the engine coolant temperature (ECT) sensor into the left cylinder head. Torque the sensor to 15 ft-lb (20 Nm).
3. Connect the engine coolant temperature (ECT) sensor connector.
4. Refill the engine with coolant.

The engine coolant temperature sensor(ect)is located
on the front of the engine, just above the alternator.
Hope this helps.

Where is the Engine Coolant Sensor located on my 2002 Envoy?

That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.