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05-01-2021, 11:17 PM | #1 | |
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2015 Yukon XL temp gauge at 0 and radiator fan running constantly
So, we just drove home and I was noticing as we were driving, the radiator fan was really loud. As we got closer to home, I noticed the temp gauge was basically all the way to cold like the car wasn't running. I was told once that the temp of the engine is measured by coolant and, if you don't have coolant, the car will read cold yet overheat. But, I opened the hood. The radiator overfill has plenty of coolant. The engine wasn't hot at all. It wasn't like I opened the hood and tons of heat was present. But, the radiator fan ran for probably 5 minutes after I shut off the truck. I'm thinking maybe the thermostat... but why wasn't the engine burning hot when I opened it if the thermostat was stuck closed? Any ideas what this is?
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05-02-2021, 09:47 AM | #2 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Your thermostat could be stuck open or and probably more likely your coolant temp sensor has failed. When it fails the ecu goes into a protect mode and acts as if the engine is overheating.
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05-02-2021, 10:07 AM | #3 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
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05-02-2021, 10:51 AM | #4 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
If the temp sensor had failed, shouldn't it have thrown an error on the dashboard?
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05-02-2021, 10:52 AM | #5 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Where is the temp sensor?
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05-02-2021, 10:59 AM | #6 | ||
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
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It's on the front of the engine. I found a YouTube video of a 16 XL with the 6.2. The guy talks about what happened and his symptoms are exactly the same as yours and he shows where is is and talks about the disconnection process. https://www.youtube.com/watch?v=LPVYpqSLnn8
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05-02-2021, 01:46 PM | #7 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Ok, so I replaced the coolant temperature sensor and the problem is still there. Now my check engine light is on. I plugged my scan tool into the car and I have 4 codes. P0118 Engine Coolant Temperature Sensor Circuit High Voltage PERMINANT P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating P0118 Engine Coolant Temperature Sensor Circuit High Voltage PENDING P0118 Engine Coolant Temperature Sensor Circuit High Voltage CONFIRMED
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05-02-2021, 01:55 PM | #8 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Ok, just watched a Youtube video and it says sometimes I need to manually erase the code. So, I'm going to go try that.
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05-02-2021, 04:15 PM | #9 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Ok, so for whatever reason, my scan tool could see the code but I kept telling it to erase the codes and it would tell me 2 codes remain or something like that. I think it said 5 and then kept decrementing. It was only deleting one code at a time. But, then it got down to 2 and wouldn't go any lower. Seems like even if the problem was still there, it would delete the code and the next time the car started up, it would then re-fire the code. But, I was thinking maybe I don't have a good enough scanner. So, I was going to drive it to autozone to see if their tool could do it or buy a more expensive scanner. But, on the way there, I noticed the fan turned off and the temp gauge started working. I know cars usually clear codes themselves when the problem is fixed and you drive it for a little bit. So, I guess that worked here. So, I think I'm set. Thanks all!
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05-03-2021, 06:38 AM | #10 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Even with the engine off/ignition on, if the PCM does not detect a correct range signal an error code will be set. If you got it to clear, that is good. If it repeats, check the connections to the CTS and wire harness.
BTW - I saw that your Griffins dropped a 19U Tier II final round game to Boston yesterday. They had a really good run up to that point.
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12-17-2021, 07:15 PM | #11 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
So, I replaced the coolant temp sensor when I made this post and it fixed the problem. But a half a year later, it's broken again? Coincidence or is something else causing it to fail?
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12-18-2021, 05:42 AM | #12 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
You can measure the resistance of the CTS, and while in there inspect the sensor's connector and wire harness.
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12-19-2021, 06:32 AM | #13 | |
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
Ok, so replaced the coolant temp sensor again and it's back running normal again. Weird it went bad so quickly.
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12-29-2021, 09:31 PM | #14 | ||
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
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Also, how do I read the chart? I'll be working on the car when it's the temp outside, so the engine will be about the temp is outside. So, it's usually around 40-60 degrees everyday. That would put me in the 40 - 70 degree range which would read 7500 - 3400 ohms. That's a pretty big range. |
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12-29-2021, 10:23 PM | #15 | ||
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Re: 2015 Yukon XL temp gauge at 0 and radiator fan running constantly
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