AutoCodes – Buick – B269D Buick

B269D Buick Code - Heater Coolant Pump Control Circuit High

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: B269D Buick indicates Heater Coolant Pump Control Circuit High.
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 1,442

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 B269D Buick 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 B269D Buick - Heater Coolant Pump Control Circuit High - AutoCodes.com — B269D Buick Code - Heater Coolant Pump Control Circuit High

What does this mean?

What are the Possible Causes of the DTC B269D Buick?

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 B269D Buick?

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 B269D Buick 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 B269D Buick code?

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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 B269D Buick Code

1. What does the OBDII code B269D mean on a Buick?

The B269D code indicates a problem with the Heater Coolant Pump Control Circuit, specifically that the circuit voltage is higher than expected.

2. What are the common symptoms of the B269D code in a Buick?

Symptoms may include a malfunctioning heater, reduced cabin heating performance, or the Check Engine Light or related warning indicators turning on.

3. What causes the B269D code to appear in a Buick?

Possible causes include a faulty heater coolant pump, damaged wiring or connectors in the control circuit, or a malfunctioning control module.

4. How is the B269D code diagnosed in a Buick?

A technician will use a scan tool to confirm the code, inspect the heater coolant pump and related wiring, and test the circuit for abnormal voltage or continuity issues.

5. Can I drive my Buick with the B269D code active?

While the car may still be drivable, ignoring the code can lead to poor cabin heating and potential damage to the heater coolant pump or related components.

6. How do I fix the B269D code on my Buick?

Repairs may involve replacing the heater coolant pump, repairing or replacing damaged wiring or connectors, or reprogramming/repairing the control module.

7. How much does it cost to repair the B269D code in a Buick?

Repair costs can vary, but replacing a heater coolant pump typically ranges from $200 to $400, while wiring repairs might cost less depending on the extent of the damage.

8. Can a weak battery cause the B269D code in a Buick?

While unlikely, electrical issues like low voltage from a weak battery can sometimes contribute to circuit-related codes.

9. How do I troubleshoot the wiring for the B269D code in a Buick?

Inspect the wiring and connectors for visible damage, corrosion, or loose connections, and use a multimeter to test for proper voltage and continuity.

10. Is the B269D code specific to Buicks, or can it appear in other vehicles?

The B269D code is most commonly associated with GM vehicles, including Buicks, but it may appear in other makes with similar systems.