lq9crew

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?

viciousknid

iTrader: (8)

Anything imparticular trigger it or did it just show up?

lq9crew

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.

viciousknid

iTrader: (8)

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.

lq9crew

This needs to be moved to the GM Board.

I don't know what happened.

bigred06

c0550 ebcm malfunction not in your pcm, your ebcm brake module needs to be replaced
internal malfunction

Kmarie26

i have a 2009 buick lucerne cxl and i recently got a ABS notification on my dash along with a little whining noise i popped a code reader on it and it gave me a code of C0550 could anyone tell me what this is and what to do from here please