Question about 2003 GMC Envoy

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2003 gmc 4.2l envoy coolant temp below thermosat rating.. I replaced the thermostat 2 months ago. No problems until now getting the same code..

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Maybe the same problem, if its not getting to 195f its not enough.

Posted on Oct 01, 2009

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1 Answer

Where is the engine coolant temp sensor on gmc envoy 2004 xuv


More than likely the thermostat is stuck open. You should replace the thermostat and the temp sensor. See picture below for location.

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Apr 04, 2013 | 2003 GMC Envoy

1 Answer

2003 GMC Envoy Service Engine light on. OBD2 Code is P0128


Ah the famous P0128.....It's 1 of 2 things. If your fan is not engaged constantly (would sound like an airplane or big rig everytime you step on the gas) and is working properly, that rules out the fan clutch. The other common problem is the thermostat. Replace the thermostat and the code will go away. Engine temperature needs to be at 210 degrees on these engines. If the fan clutch is constantly engaged, it's cooling the engine off constantly and won't get up to 210 fast enough. If it's the thermostat, it's stuck open and isn't allowing the coolant to properly heat up in time.

Feb 08, 2011 | 2003 GMC Envoy

1 Answer

Where is the location of the coolant temperature sensor on my 2004 gmc envoy,and what is the best way to get at it?


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

Nov 20, 2010 | 2002 GMC Envoy XL

1 Answer

Where is coolant temp sensor located on 2003 gmc envoy v6? How do you replace it?


heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Jun 21, 2010 | 2003 GMC Envoy

1 Answer

I have a 2005 GMC ENVOY with a sensor reading of 0128 and they said it was my sensor bad. But now i am loosing power going up hill. Does this mean i have another problem? If so what could it be?


PO-128 Coolant Thermostat, Temp Below Regulating Temperature

Leaking or stuck open thermostat
Coolant temp sensor
Cylinder head temp sensor
Engine coolant level

You could have more than one issue

The only way to answer your questions,is to put a scanner on your vehicle,and see what codes you have.
The codes you get,do not indicate a failure,necessarily
You have to follow a diagnostic process,to find any problems.
If you have been going to auto parts stores,to have codes read,and have no knowledge or intension of doing your own work,you need to find a good repair shop, and just have it repaired,fairly soon

May 25, 2010 | 2005 GMC Envoy

1 Answer

Envoy shaking when stop


p0128 engine coolant thermostat below operating temp. Possible low on antifreeze. not plugged in, possible chaffed wires.

P0106 pertains to the throttle body. most cases involve cleaning the throttle body

p0614 i could not find code definition

Aug 04, 2009 | 2003 GMC Envoy

1 Answer

2003 GMC code P0128


PO128 insufficient ambient temperature.your thermostat is either sticking open or you have the wrong temperature rating it should be 195 degrees.

May 30, 2009 | Mazda Protege Cars & Trucks

1 Answer

Cold and no heat


This is a common complaint for the 4.3 v-6 by GM, what happens over time is air gets into the cooling system, usually a small coolant leak at the intake manifold gasket. Ait gets in the cooling system and starts electrolisis. From this the coolant starts to solidify. If I'm correct your heater core is plugged. Remove the radiator cap (engine cold only) and inspect the coolant. The proper color should be red. If the elctolisis is taking place the coolant will turn to rust and look like mudd. If you find mudd in the radiator, most likely the heater core is plugged. This is a very expensive repair. You'll need to remove the raditor & sent it out to be boiled out. Replace the heater core, thermostat and the coolant hoses. You'll also need to perform a "prestone" flush. You may need to flush the cooling system monthly until the system is clean.

Oct 17, 2008 | 1998 GMC Envoy

5 Answers

Check engine light on - 2003 gmc envoy XL


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.

May 18, 2008 | GMC 2003 Envoy XL

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