P01EE

Engine Coolant Heater B Control Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Extended engine warm-up time
Unstable engine operation at idle
Increased fuel consumption in the cold season

Causes

Broken or damaged wiring harness
Coolant heater malfunction
Oxidation of contacts in connectors
Faulty relay or fuse
Problems with the engine control unit

How to Fix

Check the condition of the wiring harness and connectors for damage
Check the resistance of the coolant heater
Check the functionality of the relays and fuses
Scan the ECU for additional errors
If necessary, replace the heater or damaged circuit elements

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