CEL when downshift under load
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4wd Low
Joined: Mar 2022
Posts: 14
Likes: 1
From: Hayden AL
CEL when downshift under load
My CEL comes on when my truck downshifts going up a long hill or steep hill when under a load then after regular driving for 5-10 mins CEL goes off nothing else changes no performance changes. Any thoughts would help thanks
Laughing Gas
Joined: Nov 2020
Posts: 994
Likes: 367
From: Republic of Texas
I you get the light, you have a code...
Not hard to do a bit of reading here and see that you need a scanner. Not the corner store thing or internet thing from Fleabay or Cramazon.
Get FORScan and the reader they tell you to get.
After you have FORScan you can find your answer with a code.
Also be specific on your truck...
Year
Miles
Mods
ETC....
We are not mind readers. Help us help you...
Not hard to do a bit of reading here and see that you need a scanner. Not the corner store thing or internet thing from Fleabay or Cramazon.
Get FORScan and the reader they tell you to get.
After you have FORScan you can find your answer with a code.
Also be specific on your truck...
Year
Miles
Mods
ETC....
We are not mind readers. Help us help you...
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,354
Likes: 5,946
From: Lake Hartwell, GA
My fist thought is the CEL is brought on by an overboost condition, but you didn't mention a chip or a "defuel" scenario.
As mentioned above, check the DTC's and go from there.
As mentioned above, check the DTC's and go from there.
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