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Engine-Codes – GMC – B0938 GMC

B0938 GMC Code - Coolant Level Sensor Circuit Low

Quick Answer

The B0938 GMC code indicates a problem with the coolant level sensor circuit being too low. Common causes include Faulty coolant level sensor, Corrosion or damage to the sensor wiring, Low coolant level due to leaks or evaporation. 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 Faulty coolant level sensor, Corrosion or damage to the sensor wiring, Low coolant level due to leaks or evaporation.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 29, 2024
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Code B0938 GMC Description

The B0938 GMC code indicates a problem with the coolant level sensor circuit being too low. The coolant level sensor is responsible for monitoring the coolant level in the vehicle's cooling system. When the sensor detects that the coolant level is below the specified range, it triggers this code. This issue can have significant implications for the vehicle's performance and overall health.

OBDII Code B0938 GMC - Coolant Level Sensor Circuit Low
B0938 GMC Code - Coolant Level Sensor Circuit Low

Common Causes of B0938 GMC

  1. Faulty coolant level sensor
  2. Corrosion or damage to the sensor wiring
  3. Low coolant level due to leaks or evaporation
  4. Coolant system blockage or restriction
  5. Electrical issues in the sensor circuit

Symptoms of B0938 GMC

  1. Engine overheating
  2. Low coolant warning light on the dashboard
  3. Poor heating performance inside the vehicle
  4. Coolant leaks under the vehicle
  5. Engine running rough or misfiring

How to Fix B0938 GMC

  1. Check the coolant level in the reservoir and top up if necessary.
  2. Inspect the coolant level sensor and its wiring for any damage or corrosion.
  3. Test the functionality of the coolant level sensor using a multimeter.
  4. Replace the coolant level sensor if it is faulty or not providing accurate readings.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix B0938 GMC

The typical repair costs for addressing a coolant level sensor circuit low issue can range from $100 to $300, including parts and labor. However, specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate.

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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 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.

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