AutoCodes – GMC – B0938 GMC

B0938 GMC Code - Coolant Level Sensor Circuit Low

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: B0938 GMC indicates Coolant Level Sensor Circuit Low.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 847

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0938 GMC 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 B0938 GMC - Coolant Level Sensor Circuit Low - AutoCodes.com — B0938 GMC Code - Coolant Level Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC B0938 GMC?

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 B0938 GMC?

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 B0938 GMC 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 B0938 GMC code?

Need more information on how to fix the B0938 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0938 GMC 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 B0938 GMC Code

1. What are the common symptoms of OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

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

2. What can cause the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low) to trigger?

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.

3. How can I diagnose the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

Diagnosing this code typically involves checking the coolant level sensor for proper operation, inspecting the wiring and connectors for damage, verifying coolant levels are adequate, and using a scan tool to read the code and clear it for testing purposes.

4. Are there any DIY repair tips for fixing the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

DIY repair tips may include checking the coolant level sensor for physical damage, ensuring the sensor is securely mounted in the coolant reservoir, inspecting and repairing any damaged wiring or connectors, and topping up coolant levels as needed.

5. Can I continue driving my vehicle with the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

It is not recommended to drive your vehicle with this code present, as inaccurate coolant level readings could lead to potential engine overheating and damage. It is best to address the issue promptly.

6. How much does it typically cost to repair the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

The cost of repairing this code can vary depending on the underlying cause. Simple fixes like replacing a faulty sensor or repairing wiring may be relatively inexpensive, while more complex issues could cost more.

7. Can a faulty coolant level sensor cause other problems in the vehicle?

Yes, a faulty coolant level sensor can potentially lead to engine overheating, coolant leaks, and inaccurate temperature readings, which may affect the overall performance and reliability of the vehicle.

8. Will resetting the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low) make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle's computer detects the problem again.

9. Is it safe to ignore the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low) if my vehicle seems to be running fine?

While the vehicle may seem to be running fine initially, ignoring this code can lead to potential cooling system issues and engine damage over time. It is best to address the problem promptly.

10. How long does it typically take to repair the OBDII code B0938 GMC (Coolant Level Sensor Circuit Low)?

The repair time can vary depending on the specific cause of the code and the complexity of the repair needed. Simple fixes may take less than an hour, while more involved repairs could take longer.