P2DA6

Coolant Heater A Over Temperature

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Overheat warning on dashboard
Reduced engine warm-up efficiency
Loss of engine power
Increased fuel consumption
Hot air from the heating system even when the heater is turned off

Causes

Coolant heater malfunction
Problems with the heater control module
Short circuit in the heater circuit
Broken or damaged wiring
Temperature sensor malfunction

How to Fix

Check the integrity of the heater circuit
Diagnose the heater control module
Check the temperature sensor and its wiring
Replace coolant heater if necessary
Update the control module software if updates are available

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