SES light comes on when i coast. - 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 04-22-2003, 11:40 PM   #1
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Default SES light comes on when i coast.

here'* a tough one. i am driving around and when i let off the throttle, after 1 second, the Service Engine Soon light comes on. when i apply more throttle, the SES light goes off. it has been doing this for a while. so i went to school and ran the codes:
code 56 QDM (Quad Driver Module) #2
now, i have no idea what a Quad Driver Module is or how to fix it. My car drives fine other than the light coming on. so my auto teacher told me: "If it doesn't clunk out or idle ruff...just leave it."
yes, my auto teacher is a moron.
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Old 04-22-2003, 11:47 PM   #2
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Hmmm. This problem sounds familiar. Does your supercharger boost not go very high?

Do you need a new boost control solenoid? See here:

http://www.bonnevilleclub.com/forum/...ic.php?p=19517
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Old 04-22-2003, 11:59 PM   #3
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wow! the speed on that was amazing! you rule! thanks alot. i am going to Pontiac garage to pick up one of those boost control solenoids. my boost only reaches 5psi (+/-1 psi) i am thankful theres a place like this to go to. and cool people like you guys to tell me correct answers!
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Old 04-23-2003, 12:31 AM   #4
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Those solenoids are about the easiest thing to replace in the world. My mom was visiting me with her '95 Park Ave Ultra doing the same thing as yours. The code said that'* what it was, bought it for $21, took 2 minutes to put it on, saved her $225 quoted by the dealer, and I looked like a genius.
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