AutoCodes – Pontiac – B0939 Pontiac

B0939 Pontiac 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 Pontiac 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 824

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

What does this mean?

What are the Possible Causes of the DTC B0939 Pontiac?

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 Pontiac?

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 Pontiac 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 Pontiac code?

Need more information on how to fix the B0939 Pontiac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0939 Pontiac code diagnosed by a professional: Find a repair shop in your area

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 Pontiac Code

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

The common symptoms include the coolant warning light staying illuminated, inaccurate coolant level readings on the dashboard, and potential overheating issues.

2. What are the possible causes of the Coolant Level Sensor Circuit High error code in a Pontiac?

The error code B0939 can be triggered by a faulty coolant level sensor, a short circuit in the sensor circuit, a wiring issue, or a problem with the engine control module (ECM).

3. How can I diagnose the Coolant Level Sensor Circuit High issue in my Pontiac?

You can start by visually inspecting the coolant level sensor and its wiring for any visible damage. Using a multimeter, you can also test the sensor's resistance and check for continuity in the circuit.

4. Can I drive my Pontiac with the Coolant Level Sensor Circuit High error code?

It is not recommended to drive your vehicle with this error code, as it can lead to coolant leaks, overheating, and potential engine damage. It's best to address the issue promptly.

5. How do I repair the Coolant Level Sensor Circuit High problem in my Pontiac?

Depending on the root cause, you may need to replace the coolant level sensor, repair any damaged wiring, or reset the ECM. It's advisable to consult a professional mechanic for an accurate diagnosis and repair.

6. Is the Coolant Level Sensor Circuit High error a common issue in Pontiac vehicles?

While not extremely common, issues with the coolant level sensor circuit can occur in Pontiac vehicles, especially in older models or vehicles with high mileage.

7. Can a DIY enthusiast fix the Coolant Level Sensor Circuit High problem in a Pontiac?

If you have experience with automotive repairs and the necessary tools, you may be able to address this issue yourself. However, complex electrical problems may require professional assistance.

8. Will resetting the error code fix the Coolant Level Sensor Circuit High issue in my Pontiac?

Resetting the error code may temporarily clear the warning light, but it will not solve the underlying problem. It's crucial to diagnose and repair the root cause to prevent future issues.

9. How much does it typically cost to repair the Coolant Level Sensor Circuit High problem in a Pontiac?

The cost of repair can vary depending on the extent of the issue, the labor rates in your area, and whether you choose OEM or aftermarket parts. It's best to get a few quotes from different mechanics.

10. Can a faulty Coolant Level Sensor Circuit High cause any long-term damage to my Pontiac?

Continuously driving with a faulty coolant level sensor can potentially lead to engine overheating, which may cause significant damage. It's essential to address this issue promptly to avoid long-term damage.