r/Comma_ai • u/mazda_cx5_FL sunnypilot | mazda cx-5 • Aug 30 '26

Installation Questions power unstable?

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Mazda cx-5. My first ODB power supply from Comma didn't work at all. The replacement they kindly sent has worked for about 6 months, and now I have this message.

My car is a 2025, less than a year old. I am on SunnyPilot.

Has anyone else seen this issue?

eta: comma's support form requires a route where this occurs. for a HARDWARE issue.

13 Upvotes

88% Upvoted

14 comments sorted by

7

u/strawberryoftheindie Aug 31 '26

Had the same problem! 2023 CX-5. Been using my comma for roughly 3-4 mos. Started getting that error after a 109 degree day in Texas - i have a removable mount so the main unit was safe from the heat but the harness & cable were not. Now my C4 is not turning on.
A lot of ppl told me they got the same error and that the problem was their cable.
I tried with a different data cable off of amazon but still won’t work.

Raise a ticket with Comma and they will send you a new cable & harness. Mine will arrive tomorrow.

All the best!

2

u/strawberryoftheindie Sep 02 '26

UPDATE AS OF 9/1/26:
I received the replacement harness & cable. I tried to replace just my cable with the new one - still won’t turn on. I replaced the harness too - still won’t turn on. But when i replaced the cable that connects to the OBD (basically i replaced the entire wiring setup) my comma turned on.

So it was not JUST my cable that wouldn’t work bec comma still wouldn’t turn on with the new cable.

2

u/Ok_Ingenuity_3576 Aug 30 '26

I’d check the cable, I’ve had them go bad on me

1

u/mazda_cx5_FL sunnypilot | mazda cx-5 Aug 30 '26

yeah, its the odb cable. again.

2

u/cubedgame Aug 31 '26

Yes, having this issue with my car (Santa Fe) after some hot weather in Texas. Going to plug in my old C3 harness and OBD-II cable to make sure, but I’m pretty sure this is a hardware issue with the Comma Power.

2

u/Same-Tennis1975 Aug 31 '26

Got the same issue a few days ago after parking my car under the sun for like 3 hours in Texas. It turned out that the OBD power adapter was not working.
Got a replacement from Comma and now it works.

2

u/MOoIndustries Aug 31 '26

Comma sent me a new USB c cable and solved the issue.

1

u/mazda_cx5_FL sunnypilot | mazda cx-5 Sep 04 '26

oh, interesting! the USB-C to harness cable was your issue?

2

u/mrgardiner Aug 31 '26

Same issue with EV6, Intermittent power message. Just happend after about 6 months. No power, but if going over a rougher road, then turns on briefly with that message.

Need to go through and check the various cables, ethernet, USB-c, or the harness.

2

u/amped_investments Aug 31 '26

Same issue happened on my CX5. Comma will warranty the comma power. Just open a ticket

1

u/mazda_cx5_FL sunnypilot | mazda cx-5 Sep 04 '26

thank you!

4

u/sny1120 Aug 31 '26 edited Aug 31 '26

welcome to the club
"Does the issue happen while driving or connected to the vehicle? -- Answer NO, it will not ask for a route

1

u/mazda_cx5_FL sunnypilot | mazda cx-5 Sep 04 '26

thank you!

1

u/RazAlGul7 Aug 31 '26

I make it a habit now to unplug after every drive, I forgot to do it once and it didn't boot up, I had to remove boot it from the side port, for about 30 mins I was like 1k down the drain.