code 504 need help from guru's

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Mar 25, 2007 | 11:59 AM

kc10fish

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code 504 need help from guru's

Diagnostic Trouble Code 0504 points to a problem with the Automatic Transmission Communications line.

Where would be a good place to start - had a speed sensor fault last month with this code as well. Cleared it and now its back. Suggestions please....

no speed sensor fault just the 504 code. Much thx in advance.

Mar 25, 2007 | 01:29 PM

kc10fish

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anyone ever have this ? ps i just changed the speed sensor but still am having the code pop up.

Mar 26, 2007 | 12:11 PM

kc10fish

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still in need of help - anyone?

Mar 26, 2007 | 05:42 PM

nitink

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I am no guru, just telling on hunch, it could be loose connection in tcu or other wires.
Remove battery, clear ECU and other electronic connections with QD cleaner & take from there. make sure VSS & TPS connections are clean and tight