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Low Transmission Temp

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Old Feb 5, 2022 | 02:50 PM
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From: Houston, Tx
Low Transmission Temp

Couldn’t find anything in search but I’m towing an empty 20ft cargo trailer and trans temp has been running around 105°. When I left Houston empty temps were around 150 and the further north I got the temps fell towards 100. Ambient right now is 20°




pretty sure the fuel pressure gauge is shot, it’s been running between 0 and 100 and truck is running fine.
 
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Old Feb 5, 2022 | 08:39 PM
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Mark Kovalsky
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From: SE Florida
Is this reading temperature from the PCM?
 
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Old Feb 5, 2022 | 09:22 PM
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From: Houston, Tx
Originally Posted by Mark Kovalsky
Is this reading temperature from the PCM?
i assume so? The edge monitor is just reading off the obd port, only the fuel pressure and EGT in that photo come from dedicated sensors.

I vaguely remember you saying the cooler still flows like 10% even when the thermostat is closed but I don’t see it keeping temps that low. And being a 6.4 pan/filter wouldn’t matter either. Actually let me pull over real quick and feel the pan, 100 vs 150+ would be very evident.
 
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Old Feb 5, 2022 | 10:16 PM
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Yeah the pan is barely warm and that was immediately after pulling a hill in Pennsylvanian that had the truck pushing 20+ psi for over a minute.
 
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Old Feb 6, 2022 | 08:33 AM
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Originally Posted by LCR
i assume so? The edge monitor is just reading off the obd port,
Yes, that is reading from the PCM.

I suspect your transmission thermostat is stuck open. I remember seeing this happen in one pre-production transmission. I didn't get to see any data from warranty claims to know if it was a common occurrence or not.
 
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Old Feb 10, 2022 | 03:24 PM
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From: Houston, Tx
Originally Posted by Mark Kovalsky
Yes, that is reading from the PCM.

I suspect your transmission thermostat is stuck open. I remember seeing this happen in one pre-production transmission. I didn't get to see any data from warranty claims to know if it was a common occurrence or not.
doubt it’s the thermostat. Picked up another trailer and headed to texas, as the ambient temps rose so did the transmission temp to the point it’s at 165 in 70° ambients. I’d think they’d stay closer to where they were.
 
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