Husky Posted September 25, 2015 Share Posted September 25, 2015 Hi all, So the ABS light recently came on in my '99 OBW. I placed the ground pin into the diagnostic connector in order to get the DTCs and ended up with codes 56, 42, and 11 (The start code on the sequence) I understand code 56 to be for an 'abnormal G sensor output voltage' and code 42 to be 'source voltage is abnormal.' My question is, what's the best way to verify these codes? The car has around 175k miles so I wouldn't be surprised if a sensor went bad, but I'd like to check in order to make sure before ordering any parts. Is there a test I can do with a multimeter on the G sensor? If so, what is the location if the G sensor in my car? Also- is code 42 related to the G sensor as well, or is that a separate problem? Thanks! Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted September 25, 2015 Share Posted September 25, 2015 Not sure if this helps but I'm pretty sure it was code 42 I got on my '00 Outback many years ago and it turned out to be a bad ground. There was a ground wire with a ring terminal on it that had a bad connection. It went away after I cleaned that up. Quote Link to comment Share on other sites More sharing options...
Husky Posted September 27, 2015 Author Share Posted September 27, 2015 Where was the ground that you cleaned up, if I might ask? Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted September 28, 2015 Share Posted September 28, 2015 Sorry about that it was code 52 I got back in 2007. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted September 30, 2015 Share Posted September 30, 2015 (edited) Source voltage is the supply voltage to the control unit. A poor ground for the unit could set both of those codes. The unit is mounted in the center of the floor pan under the dash. There are ground points on both sides of the center console at the base of the dash. Make sure those are clean and tight. The G sensor is mounted under the center console and can be damaged if anyone has ever spilled a soda or coffee on the console. The unit is sealed, but liquid can still get in the wire connector and cause a poor connection. Edited September 30, 2015 by Fairtax4me Quote Link to comment Share on other sites More sharing options...
idosubaru Posted September 30, 2015 Share Posted September 30, 2015 nice job tracking down the codes. clear the codes and see if one or both come back immediately or which one comes back first is separate. Quote Link to comment Share on other sites More sharing options...
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