P2DA5

Coolant Heater A Supply Voltage Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Extended engine warm-up time in cold weather
Check Engine Light on Dashboard
Reduced efficiency of the interior heater
Possible problems with starting in severe frosts

Causes

Open or short circuit in the heater power supply circuit
Faulty heater relay or fuse
Problems with the coolant heater itself
Engine control unit malfunction
Poor contact in heater circuit connectors

How to Fix

Check heater circuit fuse
Inspect wiring and connectors for damage
Check the functionality of the heater relay
Test the resistance of the heating element
If necessary, replace the coolant heater

Related codes

P2DA6 P2DA4 P0030