P2DA4

Coolant Heater A Internal Control Module Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–222 (est.)

Symptoms

Long engine warm-up in cold weather
Reduced interior heating efficiency
Check Engine Light Illuminates
Possible errors in related systems

Causes

Heater control module malfunction
Problems in the heater electrical circuit
Poor contact or corroded connectors
Mechanical damage to the heating element
Problems with the module software

How to Fix

Check error codes and freeze frame data
Diagnose the heater control module
Check the integrity of the electrical circuit and connectors
Test the heating element
If necessary, replace the control module or heater

Related codes

P2DA5 P2DA3 P0597