Polestar Polestar 2 2021–2026 — technical service bulletin
Bulletin 37523 · NHTSA communication 11025983 · issued Oct 31, 2025
Technical service bulletin
communication type
Fuel/propulsion System
component
2021–2026
model years
6
vehicle entries
Official summary
This is a TJ If a customer experiences a "Propulsion System Service Required" message in the DIM, and the DTC IEM P0CBC62 is stored, please follow the advice under "Service". There have been cases where the IEM has been replaced incorrectly for this DTC, and instead, a faulty one-way valve in the coolant system was the root cause. To determine if this coolant valve is faulty, the IEM transistor temperature parameters for phases U, V, and W can be monitored and plotted with VIDA.
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.