Brake/airbag/battery lights on

Tiny
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.
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Saturday, March 6th, 2021 AT 7:00 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,615 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
Tiny
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. Agà ero (The engine is a 4 cylinder)
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Monday, March 8th, 2021 AT 1:08 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 107,615 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

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