B0939
Coolant Level Sensor Circuit High
B0939 is an OBD-II diagnostic trouble code meaning: Coolant Level Sensor Circuit High. Common causes: coolant level sensor malfunction, short circuit in wiring harness. Estimated repair cost: $22–56.
Symptoms
- False coolant level readings on the dashboard
- Check engine light is on
- The engine may go into emergency mode
- Incorrect operation of the cooling system
Causes
- Coolant level sensor malfunction
- Short circuit in wiring harness
- Broken or damaged wires
- Problems with the ECU
- Corrosion of sensor contacts or connectors
How to Fix
- Check the coolant level and add if necessary
- Inspect the coolant level sensor for damage
- Check the wiring harness and connectors for damage or corrosion.
- Test the sensor with a multimeter
- Replace the sensor if a fault is detected
- Clean or replace connectors if necessary
- Check the ECU for errors
Related codes
Error B0939 by Vehicle Brand
FAQ
What does the B0939 code mean?
B0939 is an OBD-II diagnostic trouble code that indicates: Coolant Level Sensor Circuit High
What causes a B0939 error code?
The most common causes of B0939 include: Coolant level sensor malfunction; Short circuit in wiring harness; Broken or damaged wires; Problems with the ECU.
How do I fix a B0939 diagnostic trouble code?
To fix B0939: Check the coolant level and add if necessary. Inspect the coolant level sensor for damage. Check the wiring harness and connectors for damage or corrosion.. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B0939?
Limited driving only, diagnose soon
How much does it cost to fix B0939?
The estimated repair cost for B0939 is $22–56. Actual cost depends on your vehicle, location, and labor rates.
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