Question about Oldsmobile 88

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I have a 1997 Oldsmobile 88 LS and I am wondering what code P 1780 is?

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P1780 is a bad neutral/park (mode) switch. This is not a common problem but I have seen them bad.The switch is located on top of the transmission where the linkage that the shift cable connects.If you ment code P1870 the let me know because this is much more common and I will go through that explanation.

Posted on Mar 20, 2011

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Code reads as -transmission control module(TCM) requested M IL illumination....

Posted on Mar 20, 2011

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P1780 is a code caused by the PCM (powertrain control module) it relates to all powertrain components. The engine, tranny, or transfer case. P1780 is a problem detected in the TCM (Transmission control module) it can either be Transmission Control switch circuit out of self test range (which basically doesn't help anything for diagnosis). Or more likely the park / neutral position switch. Quite often this switch (which is located at the top of the transmission where the shifter cable engages) is out of adjustment, or has lost its ignition power feed to be able to determine what gear it is in. Check all fuses, but its still best to have it diagnosed at a reliable transmission shop. It could be a simple shift cable adjustment.

Posted on Mar 20, 2011

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