sensors receive 3.4 volts instead of 5 volts?

2011 CHEVROLET CAPTIVA
125,000 MILES • 2.0L • 4 CYL • TURBO • 4WD • MANUAL
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ABAYA
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  • 77 POSTS
Hi.

All sensors receive 3.4 volt instead of 5 volts. Ground is good and there is no short.
Feb 17, 2025 at 5:17 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
So if you have a bad sensor, it will cause this issue. I would start by disconnecting the sensors one at a time while testing the voltage with each disconnection. When the voltage returns you have found the bad sensor. Can I ask if you have run the codes to see if any are stored? If not, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

I would try the coolant sensor first, here is the location. Check out the images (below). Let us know how it goes.
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Feb 18, 2025 at 10:30 AM
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