P030F

Ignition B Control Signal Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Misfires
Unstable engine operation
Power reduction
Increased fuel consumption
Check Engine Light Illuminates

Causes

Ignition coil B fault
Open or short circuit in wiring harness
Problems with the ECU
Contact corrosion
Crankshaft position sensor malfunction

How to Fix

Check the condition of ignition coil B
Inspect the wiring harness for damage
Check contacts and connectors
Test the ECU for errors
Replace faulty components

Related codes

P0301 P0302 P0303 P0304 P0351