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DTC C0550 "Electronic Control Unit (ECU) Performance

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Old 01-24-2009, 10:02 PM   #1
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Default DTC C0550 "Electronic Control Unit (ECU) Performance

C0550 "Electronic Control Unit (ECU) Performance" MH ($29) "Electronic Brake Control Module (EBCM)"

"Service braking system" message on the DIC, abs + brake lights on the dash. PCM went reduced power, only 40% throttle per EFI. Never saw this code or message/lights before, but truck has gone REP before with no codes set. First time I got to scan it.

Dealer? Warranty up in 5k miles. Have stock pcm for this. Code reset immediately after clearing and restarting. SO it should do the same if I swap to factory pcm? I want the dealer to see this code if they will fix it.

Any idea's?

Last edited by lq9crew; 01-24-2009 at 10:04 PM. Reason: info needed
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Old 01-24-2009, 10:28 PM   #2
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Anything imparticular trigger it or did it just show up?
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Old 01-24-2009, 10:46 PM   #3
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The lights and message out the blue. Truck has gone into reduced power before with no codes.

Truck running strong now, code present again after clearing.

Thanks.
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Old 01-24-2009, 10:48 PM   #4
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I've gotten service Brake System out of the blue before. I was thinking it was because of the cam not giving enough vacuum.

Not sure tho. Hopefully someone knows.
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Old 01-25-2009, 03:04 PM   #5
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This needs to be moved to the GM Board.

I don't know what happened.
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Old 01-28-2009, 07:30 PM   #6
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c0550 ebcm malfunction not in your pcm, your ebcm brake module needs to be replaced
internal malfunction
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