What is the issue P0697 code?

KEITH BEAL

MEMBER
2012 BUICK REGAL
145,000 MILES

P0697 I'll replace the mass air flow sensor I also replaced all the relays And new air filter install I also did a hard reset by unplugging the battery terminals and letting it sit for over 40 minutes to reset the computer and it's still pops up the same code.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
45,347 POSTS

The P0697 code is related to the sensor reference voltage. Specifically, this code indicates a problem with the "Sensor Reference Voltage 'C' Circuit Low."

It sounds like the battery is bad or the voltage sensor has gone out, here is a guide to help you load test the battery or you can take it to the auto parts store for testing.

https://www.2carpros.com/articles/car-battery-load-test

Clear the codes once the repair has been completed. Check out the images (below). Let us know if you need anything else.

Images (Click to make bigger)