Mazda CX-70 Plug-In Hybrid 2024–2025 — technical service bulletin
Bulletin 07-006-25 · NHTSA communication 11023695 · issued Sep 25, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2024–2025
model years
3
vehicle entries
Official summary
Some customers may complain that the heater does not work properly and that a warning about a hybrid abnormality appears on the Instrument Cluster. Upon inspection, the vehicle may have DTC P0AA6:00 (High voltage insulation malfunction: Decrease in vehicle insulation resistance) stored in memory. This is caused by an inappropriate casting method of the water heater during the manufacturing process. To eliminate this concern, the casting method for the aluminum heat sink has been modified from low-pressure to high pressure casting and a seal has been added to the sheath pipe opening in the circ
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.