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#1
12-28-2007, 07:45 PM
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99 Gran Prix Gt Tranny issues
Car has 150,000 miles tranny will work fine then slip and set code o742 sometimes converter will lock at idle in gear and stall engine sometimes will set code 0752 what gives is the computer haywire? Then times it will work like it should with no problems any ideas will be great thanks
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#2
12-30-2007, 09:18 AM
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Re: 99 Gran Prix Gt Tranny issues
Welcome to AF.
When was the last transmission service - screen filter and ATF? DTC P0742 is basically Torque Convertor Clutch (TCC) Stuck On when commanded off. When it sets it commands the TCC on at maximum capacity which explains your symptoms. Typically not a PCM module (computer) problem.
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#3
12-30-2007, 09:02 PM
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Re: 99 Gran Prix Gt Tranny issues
Put one can transx in ran and pulled filter and fluid ,new filter with two 24 oz. bottles ok Lucas trans treatment and new fluid runs like a champ so far just normal debris in pan nothing abnormal must have been just some junk floating around inside. Thanks Ethan!
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