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Who told you that you needed to fix these codes to pass the smog test? If it was a garage, they are scamming you into work that you don't need! Get the FIXD sensor and it will tell you the codes via your smartphone and allow you to reset codes. Or you can buy a cheap scan tool.
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
there is no B0281 only a c0281 and that is your abs is malfunctioning because of the brake lamp switch. check connection on switch if it is fine you need a new switch
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.
ABS on ? DTC'S - diagnostic trouble code's are probably stored in the ABS control module . 4X4 an ABS are not related . To fix , take it to a qualified repair shop.
SERVICE 4WD: Refer to Transfer Case Circuit Description in
Transfer Case Shift Control Module
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information. The transfer case shift control module monitors the speed of the front and rear propshafts in order to detect wheel slippage. When wheel slippage is detected, the module applies a clutch pack contained in side the transfer case. This clutch pack is used to lock-in and apply the front propshaft, transferring torque to the front wheels. The clutch pack is applied by a motor/encoder assembly. When slip is no longer detected by the transfer case shift control module, the clutch is no longer applied.
These are all code's for 4X4 Do you know what a DTC is ? diagnostic trouble code
DTC B0770
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550
ABS DTC'S
DTC C0221-C0227 or C021
DTC C0229 or C029
DTC C0235-C0237, C035-C037, or P1504
DTC C0238 or C038
DTC C0241-C0254 or C041-C054
DTC C0265 or C0266 and C065 or C066
DTC C0267 or C0268 and C067 or C068
DTC C0269 or C0274 and C069 or C074
DTC C0271-C0273, C0284
DTC C0279
DTC C0281 or C081
DTC C0283 (w/NW7)
DTC C0287, P1644, or P1689
DTC C0290 or C0292
DTC C0291
DTC C0297
DTC C0298 or P1571
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