Transmission Trouble Codes - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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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 02-06-2005, 04:13 PM   #1
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Default Transmission Trouble Codes

Hi All,

I have a 95SSEi with about 113k on it. The other day the 'check engine' light came on, so I read the codes and it came back with 2.

1) P1640 - QDM 1 - failure

2) P0740 Torque Converter Clutch circuit malfunction

Any ideas on the next step I should take? What do those codes mean? Are they both tranny codes?

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