AutoCodes – GMC – B269C 2018 GMC Sierra

B269C 2018 GMC Sierra Code - Heater Coolant Pump Control Circuit Low

Quick Answer

The coolant heater pump is controlled by a relay. Common causes include Faulty Heater Coolant Pump, Heater Coolant Pump harness is open or shorted, Heater Coolant Pump circuit poor electrical connection. 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: B269C 2018 GMC Sierra indicates Heater Coolant Pump Control Circuit Low.
Common causes: Common causes include Faulty Heater Coolant Pump, Heater Coolant Pump harness is open or shorted, Heater Coolant Pump circuit poor electrical connection.
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 254

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 May 29, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B269C 2018 GMC Sierra Description

The coolant heater pump is controlled by a relay. When operating conditions exist that require coolant flow when the engine is not operating, the Heating, Ventilation, and Air Conditioning (HVAC) control module turns ON the heater coolant pump by applying ground to the relay control circuit which energizes the heater coolant pump relay.

OBDII Code B269C 2018 GMC Sierra - Heater Coolant Pump Control Circuit Low - AutoCodes.com — B269C 2018 GMC Sierra Code - Heater Coolant Pump Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC B269C 2018 GMC Sierra?

Faulty Heater Coolant Pump
Heater Coolant Pump harness is open or shorted
Heater Coolant Pump circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC B269C 2018 GMC Sierra?

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 B269C 2018 GMC Sierra 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 B269C 2018 GMC Sierra code?

Need more information on how to fix the B269C 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 B269C 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B269C in a 2018 GMC Sierra related to the Heater Coolant Pump Control Circuit Low?

- Common symptoms include reduced heating performance in the vehicle, fluctuating coolant temperatures, and a potential check engine light.

2. What are the possible causes of the OBDII code B269C in a 2018 GMC Sierra?

- Possible causes may include a faulty heater coolant pump, damaged wiring or connectors in the control circuit, or a malfunctioning temperature sensor.

3. How can I diagnose the Heater Coolant Pump Control Circuit Low issue in my 2018 GMC Sierra?

- Diagnose the issue by inspecting the heater coolant pump, checking the wiring and connectors for damage, and testing the temperature sensor for proper function.

4. Can I continue driving my 2018 GMC Sierra with the OBDII code B269C present?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further heating system issues and potential engine damage.

5. How can I repair the Heater Coolant Pump Control Circuit Low problem in my 2018 GMC Sierra?

- Repair options may include replacing the faulty heater coolant pump, repairing damaged wiring or connectors, or replacing the temperature sensor as needed.

6. Is it possible to reset the OBDII code B269C in a 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of the problem to prevent it from recurring and potentially causing more significant issues.

7. What are some preventive maintenance tips to avoid encountering the B269C code in a 2018 GMC Sierra?

- Regularly inspecting the heating system components, maintaining proper coolant levels, and addressing any heating system issues promptly can help prevent this code from appearing.

8. Can extreme weather conditions contribute to triggering the OBDII code B269C in a 2018 GMC Sierra?

- Yes, extreme weather conditions can sometimes exacerbate issues with the heater coolant pump control circuit, leading to the code being triggered.

9. How long does it typically take to repair the Heater Coolant Pump Control Circuit Low issue in a 2018 GMC Sierra?

- The repair time can vary depending on the specific cause of the problem, but it may take a few hours to a day to diagnose and fix the issue properly.

10. Are there any recalls or technical service bulletins related to the OBDII code B269C in a 2018 GMC Sierra?

- It is recommended to check with a GMC dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code in your vehicle model.