Braking Power Low Warning - Malfunction

[Kaizen]

Hi Folks, 

My NX shocked me the second time with the Brake Power Low warning, all the Dash lights came on, it was an array of warnings, there were a couple more about collision detection failure etc, captured the four pics (attached):

The first time this occurred, I took it to a Lexus dealer for diagnosis. They could not pick anything, cleared the codes and advised me to contact them again if the problem recurred.

When it happened first time, my car ran fine after a few minutes of stop/start. Today, the same behaviour, I stopped the car for a couple of minutes, full off/on and it was back on the road. I might have done approximately 600 odd miles since it last happened over a month ago.

During these occurrences, the car brakes lost power (as the dash warning says) and it required much more force on the pedals to slow/stop the car - it is a scary situation, especially as it happened twice during peak traffic times.

Has this occurred to you or can someone shed some light on the already full-lit Dashboard please🙂 before I book another appointment? Lexus dealer is miles away but have a Toyota dealer much closer - not sure if they will check this one.

Please share your thoughts.

Thank you.

[Alan Thompson]

I've read before where multiple warnings can be the symptom of a 12v Battery on its way out. It's worth checking the health of that Battery?

[Kaizen]

1 hour ago, Alan Thompson said:

I've read before where multiple warnings can be the symptom of a 12v battery on its way out. It's worth checking the health of that battery?

Hi @Alan Thompson - thank you, I will get it checked. 

[RONNIE W HODGEKINSON]

On 5/10/2024 at 12:13 PM, Kaizen said:

Hi @Alan Thompson - thank you, I will get it checked. 

Yes Would agree with That comment..Have your 12v Battery checked..!!

[Kaizen]

I thought I would drop an update, the vehicle is back to the dealer for the third time. They checked the Aux Battery and said it was fine. The first time, they identified nothing and cleared codes. The second time, they said it was the connector to the brake fluid and said they fixed it during diagnosis and billed me. The issue recurred, back to the dealer, they wanted the car longer to be checked, left it with them for diagnosis. I will update this post later once I hear from the service team.