Budget Battery Capacity Readout

[Miles777]

Run the car out of gas, and let the battery drain to zero. That battery is shot, just need to give it a few more kicks.

By the time the true capacity is being displayed, you'll probably be over the warranty mileage!

 

[Landshark]

My 2018 Clarity (~159,000 km...1,000kms away from the battery warranty expiry) just popped up a CEL and POWER SYSTEM warning on through dash. Connected to OBDII and codes P1DC7 and P0A7F came up (Hybrid battery pack - deterioration). Brought it to the dealership and 2 days later, they said they cleared the codes and come back if the error reappear. They stated that's Honda SOP.

The weird part is the battery range is much higher and battery capacity jumped from 42Ah, measured a few weeks ago, to 55Ah. Thanks to your post, I'm waiting for this to stabilize.

The dealer is trying to pull a fast one on you and they may succeed. They should have provided, or you should have asked for, a battery capacity reading prior to the codes being cleared. They’ve reset the codes, which reset the capacity reading and there’s a good possibly that the code won’t appear again until after you’ve exceeded the warranty period. Honda SOP “Screw the customer”.

 

[Hobbesgsr]

The dealer is trying to pull a fast one on you and they may succeed. They should have provided, or you should have asked for, a battery capacity reading prior to the codes being cleared. They’ve reset the codes, which reset the capacity reading and there’s a good possibly that the code won’t appear again until after you’ve exceeded the warranty period. Honda SOP “Screw the customer”.

I wasn't worried about the battery capacity since that was within the battery warranty range. I did ask for a copy of the diagnostic printout with the odometer reading and the fault codes. Plus the rep promised to keep the service ticket open even if the odo goes past 160k; whatever that is worth.

I hope that within the next 1000km, I can get enough full charge cycles in.

 

[Conelite]

I got all the same codes with 46ah capacity. Just changed my 12v battery and it went away. That's probably your issue.

My battery would read around 11.8-12.1v with the car off..... Think the system freaks out if it's not holding charge right.

 

[Landshark]

I got all the same codes with 46ah capacity. Just changed my 12v battery and it went away. That's probably your issue.

My battery would read around 11.8-12.1v with the car off..... Think the system freaks out if it's not holding charge right.

View attachment 27633

There’s more information available about those codes than what your fault log manager displays. They indicate a more serious condition than a weak 12V battery and replacing the 12V battery is not on the list of proposed solutions.

Codes don’t always pinpoint a problem but a good first step is to have them read and properly diagnosed by a dealer. The DIY code readers rarely proved the level of detail that a dealers reader provides.

 

[Hobbesgsr]

I got all the same codes with 46ah capacity. Just changed my 12v battery and it went away. That's probably your issue.

My battery would read around 11.8-12.1v with the car off..... Think the system freaks out if it's not holding charge right.

View attachment 27633

Thanks for the suggestion but I have a ScanGuage permanently mounted and set to monitor LV battery voltage and RPM. Voltage reads 12.8V resting and 14.6V on.