P030B

Ignition A Control Signal Circuit Low

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Misfires
Unstable idle
Reduced engine power
Increased fuel consumption

Causes

Open or short circuit in wiring harness
Ignition coil malfunction
Problems with the engine control unit (ECU)
Poor contact in connectors

How to Fix

Check the wiring harness for breaks or damage
Check the ignition coil for functionality
Check connectors and contacts for oxidation or damage
If necessary, replace faulty components

Related codes

P0301 P0302 P0303 P0304