Polestar Polestar 3 2025–2026 — technical service bulletin
Bulletin 37515.1.0 · NHTSA communication 11035007 · issued May 6, 2026
Technical service bulletin
communication type
Unknown / Other
component
2025–2026
model years
2
vehicle entries
Official summary
This is a Tech Journal - If a customer experiences an Electric System Limited message along with reduced performance, and there are temperature-related DTCs in the HLCM, the root cause may be restricted coolant flow to the HLCM. Please follow the advice under "Service" to test the HLCM cooling performance. HLCM (High to Low Voltage Converter Module)
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.