P01F9

Engine Coolant Heater B Control Circuit Driver Current/Temperature Too High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Deterioration of engine performance in the cold
Extended engine warm-up time
Check Engine Light Illuminates

Causes

Coolant heater malfunction
Wiring Harness Problems
Short circuit in control circuit
Control module malfunction

How to Fix

Check the resistance of the coolant heater
Inspect the wiring harness for damage
Check control circuit for short circuit
Replace faulty components

Related codes

P01F8 P01FA P0128