AutoCodes – Pontiac – B0940 Pontiac

B0940 Pontiac Code - Coolant Level Sensor Circuit Open

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: B0940 Pontiac indicates Coolant Level Sensor Circuit Open.
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 852

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 B0940 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 B0940 Pontiac - Coolant Level Sensor Circuit Open - AutoCodes.com — B0940 Pontiac Code - Coolant Level Sensor Circuit Open

What does this mean?

What are the Possible Causes of the DTC B0940 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 B0940 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 B0940 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.

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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 B0940 Pontiac Code

1. What are the common symptoms of OBDII code B0940 Pontiac (Coolant Level Sensor Circuit Open)?

The common symptoms include inaccurate coolant level readings on the dashboard, warning lights related to coolant levels, and potential issues with the vehicle's cooling system.

2. What are the possible causes of OBDII code B0940 Pontiac?

Possible causes include a faulty coolant level sensor, damaged wiring or connectors in the coolant level sensor circuit, low coolant levels, or a malfunctioning engine control module (ECM).

3. How can I diagnose the Coolant Level Sensor Circuit Open issue?

Diagnosing the issue involves checking the coolant level sensor for proper operation, inspecting the wiring and connectors for any damage or corrosion, and testing the ECM for any faults related to the coolant level sensor circuit.

4. Can I drive my Pontiac with OBDII code B0940?

It is not recommended to drive your Pontiac with this code as inaccurate coolant level readings can lead to potential overheating issues and engine damage. It's best to address the issue promptly.

5. How can I repair OBDII code B0940 Pontiac?

Repairing the code may involve replacing the coolant level sensor if it is faulty, repairing or replacing damaged wiring or connectors, ensuring the correct coolant level in the reservoir, and resetting the ECM after the repairs are completed.

6. Will resetting the OBDII code B0940 Pontiac clear the issue?

Resetting the code may temporarily clear the warning lights, but if the underlying issue causing the Coolant Level Sensor Circuit Open is not addressed, the code is likely to reappear.

7. Is it safe to ignore OBDII code B0940 Pontiac?

Ignoring the code can lead to potential cooling system problems, engine overheating, and damage. It's important to address the issue promptly to ensure the proper functioning of your vehicle.

8. Can a DIY enthusiast fix OBDII code B0940 Pontiac?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the Coolant Level Sensor Circuit Open issue. However, if you are unsure, it's best to consult a professional mechanic.

9. How much does it cost to repair OBDII code B0940 Pontiac at a repair shop?

The cost of repair can vary depending on the exact cause of the issue, labor rates, and replacement parts needed. It's recommended to obtain quotes from different repair shops for an accurate estimate.

10. How can I prevent OBDII code B0940 Pontiac from occurring again in the future?

Regularly checking and maintaining the coolant level, ensuring the coolant level sensor is functioning correctly, and addressing any cooling system issues promptly can help prevent the recurrence of this OBDII code.