My ‘17 Accord EX has 45k miles. All of the dashboard warning lights have come on, except for the check engine lights. I disconnected the battery and reconnected it. Lights went out for three days, then reappeared. Car seems to be fine. Battery is only 1.5 yrs old.
Any thoughts as to what this could be? Any input appreciated.

Thanks in advance.
Mike

 

When the lights turn on, stop by a parts store and have them scan for codes. Post the codes on here.

When the lights turn on, does you have performance issues driving your car?

 

Thanks PAhonda. Will do.

This morning I checked the voltage at the battery while idling. It read 12.5v. Thought that was low as I was looking for something in the mid 13’s.
Car seems to run fine with no noticeable change in engine sound with lights, heated seat, fan on. Interesting.

 

Is the 12.5V measured when the engine is running?

 

Sorry for the long delayed response. Yes it was 12.5 at idling.

I ended up having the local Honda dealer look at it. They said all the warning lights (8 of them) were attributed to the alternator failing. They also said the failed alternator ruined the battery as it would no longer hold maximum charge. Luckily I had the dealer replace the battery November 2021 and it came with a three year free replacement so that saved me $160.

They replaced the alternator and battery. Upon clearing all the warning lights they said a rear wheel speed sensor would not clear. They attributed this to low voltage damaging the sensor. They ordered the sensor ($45) and will install it and just charge for the part when it arrives. Until then I will have to live with the on again, off again intermittent warning lights on the dashboard.

While I would have much rather had my regular garage do the repair, the dealer got it in that day and replaced the battery and alternator and got it back to me quickly.

The Honda alternator was $541. Labor and diagnostics doubled the price. Ouch. If it was my older F-150 I would have just gone to NAPA and taken a chance on one of their crappy rebuilts but I’m hoping the OEM one will last longer than the first one.

 

Hopefully you only have the TCS/traction control lights showing up and not the other lights.

 

Fingers crossed. I had watched YT videos on the problem and it sounded like a faulty wheel sensor will trigger the dashboard warning light “show”.
Since I got the car back they are truly intermittent. At times there are 8 lights on, sometimes three, and other times all will go out.

 

Update- took the car back to the dealer. They had told me the rear passenger side speed sensor was bad. I was watching the tech through the door window. He was replacing the driver’s side one. Now they tell me the other side is bad. But they will replace the other side at no charge when it arrives. I am no longer confident they know what they are doing.

Given that the warning lights would sometimes all go out and come back on, I now thinking there is a bad electrical contact in one of the sensors. I’m going to try cleaning all the connections with electrical contact cleaner and check for any loose or damaged wires.

Very frustrating.

 

I have the same issue. My issue started when we had a heat wave in Los Angeles. Since the sensors are on the front windshield, when it gets hot, all of my warning lights go on. On cool days, the lights are not on.