2015 Leaf has ABS Issues.

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New member
Nov 24, 2023
My 2015 leaf has the ABS light on. The brake pedal makes noises, and it seems hard to use. I changed the 12v battery, but the issue still persisted. I took it to the Nissan dealership and they told me that that they need to replace the Brake Controller Assembly, which would cost $4,500 or more, on top of that they think they need to change the controller harness, I'm not sure how much that would be. I've heard that perhaps clearing codes with Leaf Spy could alleviate this issue, what do you think?
Clearing codes may very well eliminate your issue. You may need to clear codes, disconnect/reconnect 12V battery, clear codes, and repeat the sequence 2 or 3 times to get all errors cleared. If the issue comes back right away, then the intelligent brake controller is probably failing. I had that issue on my 2015 and just cleared the codes whenever it happened. The failures eventually became more frequent so I finally had the brake controller replaced under the extended warranty that I purchased when I bought the car. I would have just continued to clear the codes if I had not been able to have the controller replaced under warranty. Make sure your 12V battery is not getting weak since a weak battery can cause communication errors on the CAN Bus (which can then cause the ABS error codes and malfunctions). Due to CAN Bus communication issues, it may take several attempts to get all of the error codes cleared.

Incidentally, the $4,500 estimate seems high and there is not much risk of the wiring harness being bad. The cost of the intelligent brake controller should be closer to $3,000.
Thanks for the help. My leaf's dash lights have all gone away. I think replacing the V12 battery helped. I'm still going to get leaf spy and see if any codes are still showing.