AutoCodes – Saturn – B0939 Saturn

B0939 Saturn Code - Coolant Level Sensor Circuit High

Quick Answer

The Powertrain Control Module (PCM) monitors the Coolant Level Sensor. Common causes include Low Coolant Level, Faulty Coolant Level Sensor, Coolant Level Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B0939 Saturn indicates Coolant Level Sensor Circuit High.
Common causes: Common causes include Low Coolant Level, Faulty Coolant Level Sensor, Coolant Level Sensor harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 822

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0939 Saturn Description

The Powertrain Control Module (PCM) monitors the Coolant Level Sensor. The PCM sets the OBDII code when the Coolant Level Sensor is not to factory specifications.

OBDII Code B0939 Saturn - Coolant Level Sensor Circuit High - AutoCodes.com — B0939 Saturn Code - Coolant Level Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC B0939 Saturn?

Low Coolant Level
Faulty Coolant Level Sensor
Coolant Level Sensor harness is open or shorted
Coolant Level Sensor circuit poor electrical connection

How to Fix the DTC B0939 Saturn?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0939 Saturn code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B0939 Saturn code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B0939 Saturn Code

1. What are the common symptoms of OBDII code B0939 Saturn (Coolant Level Sensor Circuit High)?

- Common symptoms include the malfunction indicator light (MIL) being illuminated, inaccurate coolant level readings, and potential overheating issues.

2. What are the possible causes of code B0939 Saturn?

- Possible causes include a faulty coolant level sensor, wiring issues in the coolant level sensor circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the Coolant Level Sensor Circuit High code in my Saturn?

- Diagnosis typically involves checking the coolant level sensor and its wiring for any signs of damage or corrosion. Using a multimeter to test the sensor's resistance can help determine if it is functioning properly.

4. Can I still drive my Saturn with OBDII code B0939 (Coolant Level Sensor Circuit High)?

- It is generally not recommended to drive your vehicle with this code active, as inaccurate coolant level readings can lead to engine overheating and potential damage.

5. How can I repair OBDII code B0939 in my Saturn?

- Repairing this code may involve replacing the faulty coolant level sensor, repairing any damaged wiring in the circuit, or reprogramming the ECM if necessary.

6. Are there any DIY tips for fixing code B0939 in a Saturn?

- DIY tips include checking the coolant level sensor connector for any loose or corroded pins, ensuring proper sensor installation, and clearing the code with an OBDII scanner after repairs.

7. Will resetting the check engine light resolve OBDII code B0939 in my Saturn?

- Resetting the check engine light may temporarily turn it off, but the underlying issue causing the code will persist until properly diagnosed and repaired.

8. How much does it cost to fix OBDII code B0939 in a Saturn?

- The cost of fixing this code can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a faulty coolant level sensor cause other problems in my Saturn?

- Yes, a faulty coolant level sensor can lead to inaccurate coolant level readings, potential engine overheating, and damage if not addressed promptly.

10. Is it safe to continue driving my Saturn if the coolant level sensor is faulty?

- It is not recommended to drive your Saturn with a faulty coolant level sensor, as it can lead to serious engine issues such as overheating and damage.