Code 57 - Boost Control Malfunction..... UGH. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-07-2007, 06:22 PM   #1
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Default Code 57 - Boost Control Malfunction..... UGH.

Got the SES twice today, both on half throttle acceleration up a slight grade. Checked it on the Scantool, says 57 - Boost Control Malfunction. I am guessing the BCS is failing? It came on twice, both about 5 seconds each, went off about 2 seconds after I let off the gas. Let me know. Thanks!
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Old 12-07-2007, 06:23 PM   #2
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did you visually check the BCA to make sure it is moving correctly? how about bypassing the BCS
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Old 12-07-2007, 06:23 PM   #3
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Sounds right. You'll be happy to know the BCS is cheap and easy to replace.

Does your boost seem to act normal?
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Old 12-07-2007, 06:26 PM   #4
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It does act normal, I got full boost, and I got proper movement when revving at idle. I DID notice around when the SES came on, the whine made a fluttering type sound.
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Old 12-07-2007, 06:33 PM   #5
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Yeah, BCS.
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Old 12-17-2007, 11:16 AM   #6
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Sounds like what happened to my '92. When my BCS failed, boost was normal but the SES light came on when letting off the accelerator at around 40 MPH or so. The BCS only takes 5 minutes to replace - 1 vacuum hose, 1 electrical connector, and 1 bolt.
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Old 12-19-2007, 09:11 AM   #7
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I don't want to hijack but what if you replaced the BCS with a brand new one and tried another BCA and still get the code once in a while? What is left?
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