Code P0742 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-20-2008, 06:25 PM   #1
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Default Code P0742

After about 3 days of not driving my car I had to go about 5 miles today to do some work. I was driving up a moderate hill gently and @ 42mph the TC locked up. This is strange because it never locks up until the tranny is worm. I pull up to the stop light and my SES lights up. When I take off first gear is normal but when it shifted into second the revs dropped to 1000 and between 25 and 55mph it "shifted" 6 times never once going above 1500rpm. Surprizingly, the car accelerated fine this way probably due to the L67s low end torque I felt like I was driving a diesel.

My question is has any of your torque converters stuck on like the in cold weather?
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Old 01-20-2008, 10:27 PM   #2
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If you have a scantool, you can try the procedure here to narrow things down. P0742
This is a TSB regarding the code that may apply, even though your car isn't specifically listed. For sticking solenoids, I've found that often a can of Sea Foam'* Trans Tune will free things up, at least temporarily.
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