A Little Newbie Help - 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 11-11-2007, 09:40 PM   #1
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Default A Little Newbie Help

My transmission has been sliipping to the point that it has become a chore to drive. I have to start it in second and shift into third only when the rpm are above atleast 3000. and if i punch it while in 3rd it will go into neutral. when i make it to fourth and punch it the rpm stays at 1500-2500 and the boost gauge is pinned. The codes that came up were

6 40 QDM1
6 70 QDM4

besides the transmission there are no other evident problems with the vehicle

can anyone help me?
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Old 11-11-2007, 09:46 PM   #2
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Would this Be Codes P0640 and P0740


OK... This is Code P0740 ... Here the PCM is seeing a Torque converter clutch Problem

Code P1640 is... QDM 1 Circuit..

This may be related to the Code above ... The PCM is seeing an improper voltage to one of the controlled items on the circuit...

The Boost Control Solenoid, EVAP Purge Solenoid And TCC Apply Solenoids are on this circuit...

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Old 11-13-2007, 12:20 AM   #3
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Flipping through the forum i saw that the QDM1 code could be the TCC, which could explain the transmission. any more help before i get my transmission rebuilt unneccissarily
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