ABS, Traction Control light ON

[Kavish Bhekharee]

Hello all,

I have U0125-00 Lost connection with Dynamics sensor, U1003-88 - ESP CAN C bus performance - bus off, C0037 - Vacuum Pump - General Electronic Failure.

What could be causing all this?

Thanks for you help!

[John/Horace]

Welcome to the site. The most common cause of these codes is a bad abs sensor on one of the four wheels, but it also normally has a specific abs code. Not all cheap code readers will pick up abs codes.

There can be lots of issues on 10 yr old vehicles in the rust belt areas. Anything from a weak older battery (5yrs plus) to rodents chewing on wire harness or main electrical grounds not making good continuity (all grounds on front strut towers need to be cleaned and left with fine film of dielectric grease, bare metal exposed and also light film.
 

Some people add higher gauge ground wires for a long term permanent fix. Search on site has info on how, Dean H has great posts about this. A good two way scan tool is best way to fix mystery electrical issues. After grounds, battery etc have been eliminated first.

[John/Horace]

Google says code c0037 is not vacuum pump but abs wheel speed sensor. 
 

That code indicates a problem with the rear left speed signal. It may suggest that the sensor has failed, which is likely, but it could also mean that the tone ring is obstructed by debris or that the wiring is damaged.

 

You can buy the wire harness with built in coil for $40 ish and not change bearing. But internal sensor ring in bearing might be problem. Bearing is a wear item, often get noisy by 100-150k miles anyway. New bearing assembly usually comes with the new abs wire harness.

Edited yesterday at 12:51 AM by John/Horace