C0309
Motor A/B Circuit High
C0309 is an OBD-II diagnostic trouble code meaning: Motor A/B Circuit High. Common causes: open or short circuit in wiring harness, malfunctioning solenoid or solenoid valve. Estimated repair cost: $56–167.
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
Error C0309 by Vehicle Brand
FAQ
What does the C0309 code mean?
C0309 is an OBD-II diagnostic trouble code that indicates: Motor A/B Circuit High
What causes a C0309 error code?
The most common causes of C0309 include: Open or short circuit in wiring harness; Malfunctioning solenoid or solenoid valve; Problems with connecting connectors; ECU malfunction.
How do I fix a C0309 diagnostic trouble code?
To fix C0309: Check wiring harness for damage. Check the resistance and functionality of the solenoid/valve. Clean connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0309?
Limited driving only, diagnose soon
How much does it cost to fix C0309?
The estimated repair cost for C0309 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat