2018 Malibu brake booster sensor P0558 wiring?

slacorte · Feb 26, 2024

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!

slacorte · Feb 26, 2024

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.

campb292 · Feb 26, 2024

Take a look at this - very possible something is flipped because these diagrams have conflict in pin position. Picture uploads weren't working very well last week so if this doesn't work... let me know and I'll figure something out.

Also, I see a rodent messed with wires. If you are not 100% sure of that or you have repaired the wiring and you are still getting ABS activation noises and that code inspect the vacuum pump. They can seize, reducing vacuum and causing issues with the brake booster and that is one of the codes. If the vacuum pump breaks up it can cause some major damage.

2018 Malibu brake booster sensor P0558 wiring?

Attachments

Top Contributors this Month

Recommended Communities