code 28 from suburban A to H from ALDL

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Oct 19, 2004
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Canada
93 Suburban when the A and H is crossed on the ALDL a code of "28" flashes.
Could someone tell me what that code is.
ABS lite on and not working.
Brakes feel spongy.
New front clipers
cleaned front ABS sensors
Bled rear front and master cylinder.
 
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