P2DA6
Coolant Heater A Over Temperature
Coolant heater A reports temperature above the protection threshold. Coolant flow blocked or thermistor failed.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Coolant flow through heater blockedCommon
- Thermistor failedPossible
Parts involved
- Coolant Heater A
- Coolant Heater A Control Module
P2DA6 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.