Reduced engine power, weird three tone with bass, and weird electrical glitches.

[darthrevan1006]

Hello, I have a 2018 equinox AWD Lt. About 2 weeks back I started to have weird electrical glitches with dash lights going from real bright to super dark, head lights randomly turning off, and a three tone do doo dooooo sound with long bass at end coming from rear speakers and will play even when something is on radio. No check engine light at this time. On my way up north last night there was a snow storm. Now on top of all that I know have a reduced engine power message. It now starts rough. And when I go to accelerate it shoots rpm to around 4 and will stay at high rec till it hits 55 then will shift and do something till around 75 mph. I would normally put a code reader on it but I am in middle of nowhere for next 2 weeks. I had changed battery with same issue persisting

 

[Hey Vern!]

Maybe a bad ground. The reduced engine power could be related or not. maybe bad gas or moisture in the gas from the weather change.

 

[PoManNox]

Have you owned your 2018 since new?

Need more info: How many miles on it? Any aftermarket electronics on it? When exactly did you swap batteries? Does the new battery pass a load, crank and charging test with a digital tester? (can buy these for $35 online). Need to run all 3 tests for the most accurate "test".

The reduced engine power thing in the very cold can be a frozen, partially blocked charge air cooler. Just throwing some things out there, but you really need to scan for codes. One last thought, is the auto stop/start still active on it? You need to bypass that ASAP if so. It does nothing good electronically or mechanically for the vehicle.