Powertrain
Definition only
Lights the check engine lamp
P2DA6: Coolant Heater A Over Temperature
Standardized SAE J2012 code · P2Dxx codes
What does P2DA6 mean?
Coolant heater A reports temperature above the protection threshold. Coolant flow blocked or thermistor failed.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Coolant flow through heater blocked
- Medium Thermistor failed
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2DA6 on the same make and model first.
P2DA6 in the community
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