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P0870 03 duramax slips out of gear

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So I have an 04 Chevy Duramax with an Allison transmission in it I have a EFI live chip put in it and whenever I have the chip turned up too high it wants to slip makes overpowers the transmission so it...


by you adjusting the chip settings you are probably upsetting the transmission TCM unit.
I suggest that you talk with an accredited Allision transmission service shop and work out how to set the chip and system properly

Feb 09, 2015 | Cars & Trucks

1 Answer

Hello, i have a Chevy 7.2 Duramax turbo diesiel.


Is the cooling fan working, and pulling air thru the radiator ?
And is the cooling system full ?

Aug 26, 2013 | Cars & Trucks

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Will reprogramming the ecm on a 2001 chev duramax help it from going into lymp mode


no it wont, it is most likely a transmission slip setting the limp mode. better save for a new allison

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I have a 2003 Duramax. While driving last night


sounds like you may have coolant in your motor

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1 Answer

2002 chevy hd duramax 4x4


Sounds like the PRNDL switch on the side of the transmission. Be sure and clear the code before trying to start after replacing it.

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1 Answer

Duramax won't come out of four-wheel drive


well there maybe some internal damge on the case these are horible transfer cases, a fork broke in mine making the case slip, check the encoder motor to make sure its working

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Transmission Slippage


check the transfer case, the chain maybe slipping i had this problem and it only got worse

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Problem with Diesel Fuel System. Gmc 2002 duramax 2500 HD 4x4 will start 

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