Suspension, Brakes and Tires Discussion, hi, i just bought my sts and...... in Item Specific Cadillac Discussion; i am having a problem where i will be driving , i go to brake and the abs and traction ...
i am having a problem where i will be driving , i go to brake and the abs and traction control lights come on and there is a muffled sound and a slight moving of the brake pedal as if something is turning on and off (so sort of pump or compressor ) it only happens for a second ....does anyone have a clue about what im talking about . it would be a big help ..thanks will martin
C1255 - EBTCM (Electronic Brake and Traction Control Module) Internal Malfunction (Probably from the C1221, and C1225 codes. Fix the hub/bearing and clear the codes to see if they come back)
C1221 - Left Front Wheel Speed Sensor Input Signal is 0 (Check the wiring to the drivers side hub/bearing... If the wiring looks good then replace the hub/bearing)
C1225 - Left Front Excessive Wheel Speed Variation (Same as above)
C1716 - Right Front Damper Actuator Short Circuit to GroundOn the front passenger side strut, look at the wiring to that strut and check how many ohms of resistance there is between the two terminals on the plug going to the strut. Spray WD-40 in the plugs)
C1717 - Right Front Damper Actuator Open Circuit (Same as above)
C1738 - Exhaust Solenoid Valve Short to GND (The exhaust valve is in the compressor. There's a relay center in the trunk (attached to the back of the back seat, behind the fiberglass wall of the trunk) that has a relay to the exhaust valve. I would check that first, and jump the terminals with a paper-clip to see if I could activate it. You should hear it click)
The History codes are just as important as the Current codes. History means that the problem occured at least once in one of the last 50 ignition cycles. Current means that the problem is currently being sensed.
I personally ignore whether it says History or Current. Either way, there was a problem there, and as with all problems it should be looked at.
Did you change out your hub/bearing yet? What's happening is the wheel speed sensor in the hub/bearing went bad. So when you move the car, the computer will sense that only three wheels are moving and it will think that the fourth one is being dragged. Thus it will cycle the ABS pump to slow you down and get that wheel spinning again. When it sees that nothing is working to get that wheel moving again, it gives up and throws codes.