AutoCodes – GMC – B0936 GMC

B0936 GMC Code - Coolant Level Sensor Circuit Malfunction

Quick Answer

The P0936 Diagnostic Trouble Code (DTC) sets when the ignition switch is in RUN position and coolant level is low. Common causes include Low Coolant Level, Faulty Low Coolant Switch, Coolant Low Switch 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: B0936 GMC indicates Coolant Level Sensor Circuit Malfunction.
Common causes: Common causes include Low Coolant Level, Faulty Low Coolant Switch, Coolant Low Switch 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 2,122

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 Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B0936 GMC Description

The P0936 Diagnostic Trouble Code (DTC) sets when the ignition switch is in RUN position and coolant level is low. No voltage on the wire between Body Control Module (BCM) and low Coolant Switch for more than 30 seconds.

OBDII Code B0936 GMC - Coolant Level Sensor Circuit Malfunction - AutoCodes.com — B0936 GMC Code - Coolant Level Sensor Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B0936 GMC?

Low Coolant Level
Faulty Low Coolant Switch
Coolant Low Switch harness is open or shorted
Coolant Low Switch circuit poor electrical connection

How to Fix the DTC B0936 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 B0936 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.

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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 B0936 GMC Code

1. What does the OBDII code B0936 mean on a GMC?

B0936 indicates a malfunction in the coolant level sensor circuit, which monitors the coolant level in the vehicle's system.

2. What are the common symptoms of a B0936 code?

Symptoms may include the coolant warning light on the dashboard, inconsistent coolant level readings, or the engine overheating due to low coolant.

3. What causes the B0936 code to appear?

Possible causes include a faulty coolant level sensor, damaged wiring or connectors, a short or open circuit in the sensor circuit, or low or contaminated coolant.

4. Can a B0936 code cause engine damage?

While the code itself does not directly cause damage, ignoring it could lead to low coolant levels and potential overheating, which can harm the engine.

5. How do I diagnose a B0936 code?

Start by visually inspecting the coolant level sensor, wiring, and connectors for damage. Use a multimeter to test the sensor circuit for continuity and proper voltage.

6. Can low coolant trigger the B0936 code?

Yes, if the coolant level is too low, it can cause the sensor to send incorrect readings, triggering the code.

7. How do I fix a B0936 code on my GMC?

Repairs may involve topping off or replacing the coolant, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the coolant level sensor.

8. Is it safe to drive with a B0936 code?

Driving with a B0936 code is not recommended, as it may indicate low coolant levels or sensor issues that could result in engine overheating.

9. How much does it cost to fix a B0936 code?

Repair costs can vary but typically range from $50 to $200, depending on whether you need a new coolant level sensor or wiring repairs.

10. Can I clear the B0936 code without fixing the problem?

Clearing the code without addressing the issue may temporarily turn off the warning light, but the code will likely return until the underlying problem is resolved.