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It sounds like there has to be an issue with the pump/modulator or even the master cylinder. I would try bleeding all 4 wheels first to see if there is any air trapped. If not you need to have the abs pump checked next
the c0281 code on a gm truck is the abs ECBM has lost the voltage to it when the brake pedal is not depressed. so if you are going at a speed above 10-15MPH and the ECBM looses the 12 volts to it ,when the brake pedal is NOT depressed ,, then this code gets generated. the brake switch has a 12 volt feed to the abs switch contact connector. the other side of this switch goes to the other connector pin. these switches wear out get dirty with time. replacing the switch or if your up to it take the switch apart and clean the contacts with a fine abrasive material to remove the oxidation. if pitted or worn replace the switch. one wire is brown the other is purple. working the brake pedal watching the volts is easy way to see if the voltage is steady when you wiggle the brake pedal.. driving on a rough road with a bad switch usually gets it acting up.
Most times when this happens with Envoys and Trailblazers, your PCM or computer is storing a check engine code, which will disable cruise control. Scan your vehicle with an OBDII scanner to see what code may be stored. Once the code is cleared, your cruise control will work again.
This C code is what is designated as a Chassis code . The specifc code is a generic and means
C0281 - Brake Switch Circuit:
It indicates a problem with the brake lamp circuit. Inspect the switch and circuit. Code C0281 is set if computer never sees the brake switch release after speeds above 15 mph during start-up.
Could be a sticky pedal or the calipers not releasing properly !
Track the p0340 first camshaft timing is very important and could possibly cayse your other codes,Call your local GMC dealer I think I remember a bulletin about this code.
Is the service engine light on? If so, take the vehicle to your local Auto Zone and ask them to check your Envoy for trouble codes, write the codes down and reply back to me.
Let me know.
Regards,
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