AutoCodes – Cadillac – B0938 Cadillac

B0938 Cadillac 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 Cadillac 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.

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Code Popularity 867

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

What does this mean?

What are the Possible Causes of the DTC B0938 Cadillac?

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 Cadillac?

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 Cadillac 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 B0938 Cadillac Code

1. What are the common symptoms of OBDII code B0938 in a Cadillac related to the Coolant Level Sensor Circuit Low?

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

2. What are the possible causes of the Coolant Level Sensor Circuit Low code B0938 in a Cadillac?

- The code B0938 can be triggered by a faulty coolant level sensor, a damaged wiring harness connected to the sensor, low coolant levels, or a malfunctioning instrument cluster.

3. How can I diagnose the Coolant Level Sensor Circuit Low issue in my Cadillac?

- You can diagnose the issue by visually inspecting the coolant level sensor and its wiring for any damage, checking the coolant level in the reservoir, and using an OBDII scanner to read the specific code B0938.

4. Is it safe to drive my Cadillac with the OBDII code B0938 related to the Coolant Level Sensor Circuit Low?

- It is not recommended to drive your Cadillac with the B0938 code, as inaccurate coolant level readings can lead to potential overheating of the engine and other serious issues.

5. Can I reset the OBDII code B0938 in my Cadillac related to the Coolant Level Sensor Circuit Low myself?

- While you can clear the code temporarily with an OBDII scanner, it is important to address the root cause of the issue to prevent the code from reappearing.

6. How do I repair the Coolant Level Sensor Circuit Low issue in my Cadillac?

- To repair the issue, you may need to replace the faulty coolant level sensor, repair or replace any damaged wiring, ensure proper coolant levels, and reset the code using an OBDII scanner.

7. Can a DIY enthusiast fix the OBDII code B0938 in a Cadillac related to the Coolant Level Sensor Circuit Low?

- Depending on your skill level and access to tools, you may be able to address the issue yourself by following repair guides and tutorials specific to your Cadillac model.

8. Will the OBDII code B0938 affect the performance of my Cadillac due to the Coolant Level Sensor Circuit Low?

- While the code itself may not directly affect performance, ignoring the underlying issue could potentially lead to engine overheating and other serious complications.

9. How much does it cost to repair the Coolant Level Sensor Circuit Low issue in a Cadillac triggering the OBDII code B0938?

- The cost of repair can vary based on the specific cause of the issue, but it may involve expenses for parts such as a new coolant level sensor and potential labor charges if professional help is needed.

10. Are there any preventive measures to avoid the OBDII code B0938 related to the Coolant Level Sensor Circuit Low in a Cadillac?

- Regularly checking and maintaining proper coolant levels, inspecting the coolant level sensor and wiring for damage during routine maintenance, and addressing any issues promptly can help prevent the code from appearing.