Brake/airbag/battery lights on

FAGUEROI

MEMBER
2009 HYUNDAI TUCSON
170,458 MILES

Brake light on. Check fluid good, check for leaks okay. Disconnect master cylinder sensor/light still on. Replace battery because notice battery light on (under warranty). I have a scanner notice codes $ 7E8 CAN STD FAST $ 7E9 CAN STD FAST reset codes no codes stored, but all lights still on please give me advise don't know what to do.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,740 POSTS

Hi,

These could all be the result of the alternator not properly charging. Do me a favor. Follow this link and let me know what you find:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know what you find. Also, let me know the engine size so I can look through schematics.

Take care and God Bless,

Joe

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Saturday, March 6th, 2021 AT 8:35 PM

FAGUEROI

MEMBER
3 POSTS

Hi Joe, I want to thank you for all your info and help, about my brothers car as he was driving to work and he got stranded. I read your answer even though I didn’t exactly know how to do all of the steps. I replaced the alternator, and everything went well no more lights The only thing that got me is those readings (codes $7E8&9). I have never seen those types of codes? I was just wondering. Thanks Fernando. Ag� ero (The engine is a 4 cylinder)

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Monday, March 8th, 2021 AT 1:08 PM

JACOBANDNICKOLAS

MECHANIC
109,740 POSTS

Hi,

I had a feeling that was the cause. As far as the codes, they are control module menus. The 8 is for the powertrain and the 9 is for the transmission.

Regardless, I'm glad it's working for you. Please feel free to come back anytime in the future if you need help. You're always welcome here.

Take care,
Joe

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Monday, March 8th, 2021 AT 5:21 PM