Trouble code C0042

2010 SUBARU OUTBACK
170,000 MILES • 2.2L • 4 CYL • 4WD • AUTOMATIC
Avatar
JAMESHYNES
  • MEMBER
  • 13 POSTS
The car looks and runs great when suddenly the following lights come on;
1. Check Engine
2. AT Oil Temp
3. Traction control
4. Brake light (flashing)
5. Cruise light (flashing)
The car continues to run fine.

The first time this happened I put the code reader on it and found;
1. P0042 (minor evap system leak)
2. C0057 (ECM Control)
3. C0045 (ICM Malfunction
4. C0042 (Power Supply Voltage Failure)

The second time this happened, I didn't have the code reader with me but after the first stop 2 lights went away and after a second stop, all lights went away.

I suspect the root of the problem is C0042. I read the ABS computer monitors voltage and an interruption could effect or cause all the other codes. I decided there may be corrosion in the plug so I tried to take the master plug off the ABS system but it is quite stuck. I don't want to risk breaking it until I am certain the problem may be there.

Any thoughts?
Nov 7, 2020 at 5:01 AM
Advertisement
Avatar
KASEKENNY
  • CERTIFIED EXPERT
  • 18,907 POSTS
I think you are on the right path. I suspect you have a connector issues where a wire is getting intermittent contact and it is setting these codes. The 3 C codes are all pointing to an electrical issue. I would run through these tests and go from there.

Let me know what questions you have but I would try to test this when the lights are on. More then likely unless you find a problem with one of the connectors, you will not turn anything up if the issue is not happening while you test it.
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Nov 7, 2020 at 7:47 AM