Random sensor lights coming on

[verity400]

I have a 2021 Odyssey and different sensor lights have been coming on every now and then. Engine, brake, emissions and even the parking alert. They stay on for a few days, then turn off then come back again later. Took this to the dealer and they have no idea what's going on! Has anyone dealt with this before?Thanks!

 

[ifixthings]

I'm thinking it's probably a bad battery or the ground. It could be a problem with the alternator not charging the battery enough. It's easy to chjeck this. Get a multimeter and measure the voltage on the battery when the car is off, you should see 12.4 V or more. If the car is running you should see 13.5 V or more.

 

[Kang_]

What did the dealer say after running diagnostics, did any error codes come up, or did they check for possible electrical or grounding issues that might explain the random sensor alerts?

 

[spirit3daway]

When random sensor lights come and go like that, engine, brake, emissions, parking... its often something electrical or software-related, not necessarily a mechanical issue. Dealers can miss this kind of stuff if it's not happening during the visit. It might be worth getting a 2nd opinion from a good independent shop or having someone scan it with a more advanced diagnostic tool. You're definitely not alone, others have had similar gremlin-like issues pop up.

 

[Reggie_t]

I've seen a few Odys do that when there is a flaky ground or a weak battery, like random lights if the voltage isn't steady. Load test the battery and check the main grounds before chasing sensors.