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2018 Malibu brake booster sensor P0558 wiring?

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3.6K views 2 replies 2 participants last post by  slacorte  
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#1 ·
A rodent made a mess of our '18 Malibu Brake booster sensor pigtail. I have replaced some of the wiring and butt connected the pigtail to the main harness and the connector. The pigtail pins are showing the following readings: Pin 1: battery voltage, Pin 2: ground, and Pin 3: 5 volts with the car running and the harness connected to my meter and not the sensor. My pin numbers are those labelled on the connector. The car ran ok for about 10 miles and then set code P0558, with the ABS activation brake noise occurring when stopping. Do these voltage readings make sense? I labelled everything and thought it was wired correctly. Could pin 1 and pin 3 wires be reversed? Or is it likely just a bad sensor?

Thanks!
 
Discussion starter · #3 ·
The vacuum pump was replaced about a year ago, and it is producing vacuum. The original pump did not suffer any catastrophic failure. I will double check the wires again this week and maybe switch the wires on pins 1 and 3.

Thanks.
 
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