Mazda CX-5 2018–2020 — technical service bulletin
Bulletin SA-035-20a · NHTSA communication 10173227 · issued Mar 11, 2020
Technical service bulletin
communication type
Engine and Engine Cooling
component
2018–2020
model years
6
vehicle entries
Official summary
Some customers may experience the CHECK ENGINE LIGHT ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: ï · The engine takes longer to warm up. ï · The engine temperature gauge fluctuates. ï · The low coolant temperature indicator (blue) light stays on longer or comes on while driving. ï · Poor heater performance, especially at idle.
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.