P1876 issue please help
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P1876 issue please help
2005 4x4 F250 6.0
Throwing code P1876
Car intermittently will put itself into 4Hi and the 4x4 light will come on. The switch can be in 2wd and it will switch itself to 4hi sometimes. Sometimes it drives completely normal. When the truck put itself into 4hi then the switch will not work into switching it back into 2wd or 4lo. The light is showing when it switches itself into 4x4 however the switch will still be on 2wd. Also when it switches itself into 4wd the air will blow out the defrost. Any idea what the issue could be or best way to diagnose the issue?
Thank you for all the help.
This was my original post in the Super duty forum.
Since then we have gone through almost everything and still nothing. Checked all the wires and loose grounds and everything is fine there. Still have not fixed this problem. Any other input would be great. Mechanic is thinking could be the GEM but in 2005s its built onto the cluster which would mean that would need to be replaced or fixed. Does anywhere fix the GEM on 2005 clusters? Has anyone had this problem before?
Throwing code P1876
Car intermittently will put itself into 4Hi and the 4x4 light will come on. The switch can be in 2wd and it will switch itself to 4hi sometimes. Sometimes it drives completely normal. When the truck put itself into 4hi then the switch will not work into switching it back into 2wd or 4lo. The light is showing when it switches itself into 4x4 however the switch will still be on 2wd. Also when it switches itself into 4wd the air will blow out the defrost. Any idea what the issue could be or best way to diagnose the issue?
Thank you for all the help.
This was my original post in the Super duty forum.
Since then we have gone through almost everything and still nothing. Checked all the wires and loose grounds and everything is fine there. Still have not fixed this problem. Any other input would be great. Mechanic is thinking could be the GEM but in 2005s its built onto the cluster which would mean that would need to be replaced or fixed. Does anywhere fix the GEM on 2005 clusters? Has anyone had this problem before?
Laughing Gas
Joined: Oct 2013
Posts: 817
Likes: 6
If the HVAC is switching to defrost on its own, you have a vacuum leak. The front hubs are vacuum controlled, but I don't know how a vacuum leak could cause the 4x4 light to come on, so that might be a separate issue.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
He has more going on than a vacuum leak.
Have you been in any deep water with the truck? Also check up under the dash to be sure that you don't have a front window water leak,
How does the instrument cluster doing? Is it reading good and no odd things happening like a gauge not reading right?
The PDF 308-07A and 413-01 are from the 2006 service info and may not cover you correctly.
Have you been in any deep water with the truck? Also check up under the dash to be sure that you don't have a front window water leak,
How does the instrument cluster doing? Is it reading good and no odd things happening like a gauge not reading right?
The PDF 308-07A and 413-01 are from the 2006 service info and may not cover you correctly.
Fleet Owner
Joined: Nov 2003
Posts: 27,919
Likes: 3,637
Just an fyi - the 4x4 module is on the passenger side under the dash. I believe Ford even refers to it as the GEM now (since most of the other GEM features have been built into the PCM).
It is probably in Sean's next-to-last attachment. Just no time to peruse them this A.M.
It is probably in Sean's next-to-last attachment. Just no time to peruse them this A.M.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Just an fyi - the 4x4 module is on the passenger side under the dash. I believe Ford even refers to it as the GEM now (since most of the other GEM features have been built into the PCM).
It is probably in Sean's next-to-last attachment. Just no time to peruse them this A.M.
It is probably in Sean's next-to-last attachment. Just no time to peruse them this A.M.
'Night All.
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