2016 Yukon Denali radiator cooling fan runs after engine shut off.

[cleancut41]

The radiator cooling fan on my 2016 GMC Yukon Denali, 117,000, runs on high after start and continues to run for a couple minutes after engine is shut off. This hasn't happened before. The temp gage stayed on zero (160) after a 10 mile drive. No warning lights except oil change reminder, and it is due for that. Any ideas?
Update: On my way home, the temp gage moved to about 190. When I shut the vehicle off the fan stopped as is normal.

 

[sealandsky]

I have found that the cooling fan runs when it wants to, no rhyme or reason...

 

[91RS]

Thermostat. P0128 will be stored in the ECM.

 

[xmms]

Did you do anything to fix this? I came here to post the same exact issue with a 2018 Yukon with 114k on it.

 

[2001 TX Tahoe]

I had the same issue and it was my thermostat.

 

[xmms]

I ran the heat and the thermostat seemed to right itself…for now. But sounds like my next step is is replacing it.

 

[Samiam5]

Just replaced mine as it did that too. My husbands Chevy Silverado 15 has same issue. Needs to be replaced

 

[Falcon4]

Having same issue, changed temperature sensor, disconnected battery, reconnected battery, temperature reading on gauge, went to lunch, coming back can hear cooling fan running, temperature gauge not reading, get home shut off engine, cooling fan continues running, pull fuses, fan shuts off, reinsert fuses, fan does not come back on....

 

[Rcurylo]

Having same issue, changed temperature sensor, disconnected battery, reconnected battery, temperature reading on gauge, went to lunch, coming back can hear cooling fan running, temperature gauge not reading, get home shut off engine, cooling fan continues running, pull fuses, fan shuts off, reinsert fuses, fan does not come back on....

Please note that I had this problem.....maybe still do as it has occurred several times following replacement of the temp sensor. Workaround was simply to clear the code and move on. However, someone noticed my coolant overflow canister was not maxed out. Cold coolant level was not at the top as described on the unit. Added coolant to proper mark and have not had recurrence.

 

[91RS]

The issue is not the temperature sensor…