C0309

Motor A/B Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Rough engine operation
Power reduction
Increased fuel consumption
Check Engine Light Illuminates

Causes

Open or short circuit in wiring harness
Malfunctioning solenoid or solenoid valve
Problems with connecting connectors
ECU malfunction

How to Fix

Check wiring harness for damage
Check the resistance and functionality of the solenoid/valve
Clean connector contacts
Check circuit power and ground
If necessary, replace faulty components

Related codes

C0308 C0310 P0010 P0011