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Tractor Talk Discussion Forum

O.T. Isuzu NPR /GM W4500

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Bryan In Iowa

03-11-2008 10:55:55




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Any NPR guru's out there ? I have 2004 NPR in shop . diesel ,auto trans . Tranny lost reverse ,,,burned up bad. I installed reman trans ,but now won't shift into overdrive ? Check Trans light starts flashing after few minutes. I see there is a TPS relearn proceedure,,but cannot get anything to flash codes out ? Truck shifts great ,other than no overdrive. Any ideas ???




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DH in Carolina

03-11-2008 11:30:08




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 Re: O.T. Isuzu NPR /GM W4500 in reply to Bryan In Iowa, 03-11-2008 10:55:55  
Hello Bryan My service manual says that the OD is controlled by the transmission computer module. There is a thermister located in the transmission pan which will not allow the OD shift if the transmission fluid is cold. The only other thing would be the electrical wiring from the OD off on switch. DH



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