AutoCodes – Buick – P19FA Buick

P19FA Buick Code - Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency

Quick Answer

The Hybrid/EV Electronics Coolant Pump is a single-speed ON/OFF pump that circulates coolant through the auxiliary coolant radiator, starter/generator control module, and the starter/generator to control the temperature of these components. Common causes include Faulty Starter/Generator Coolant Pump Relay, Faulty Starter/Generator Coolant Pump, Starter/Generator Coolant Pump 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: P19FA Buick indicates Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency.
Common causes: Common causes include Faulty Starter/Generator Coolant Pump Relay, Faulty Starter/Generator Coolant Pump, Starter/Generator Coolant Pump 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 322

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 Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P19FA Buick Description

The Hybrid/EV Electronics Coolant Pump is a single-speed ON/OFF pump that circulates coolant through the auxiliary coolant radiator, starter/generator control module, and the starter/generator to control the temperature of these components.
The Enable and Feedback circuits allow the drive motor control module to control and monitor the Hybrid/EV Electronics Coolant Pump.
The Enable circuit controls the starter/generator coolant pump relay by applying ground to the relay coil control circuit. With the coil grounded, the relay switch is closed, and voltage is sent to the coolant pump, which begins circulating coolant.
The Hybrid/EV Electronics Coolant Pump utilizes a pulse-width modulated signal on the Feedback circuit to the drive motor control module. During normal operation, the feedback circuit provides pump speed information to the control module. If the Hybrid/EV Electronics Coolant Pump determines there is an internal fault it provides this information on the same feedback circuit instead of pump speed information. The starter/generator control module contains the Hybrid/EV Powertrain Control Module 1, drive motor control module, and the 14 V power module.
The Hybrid/EV Powertrain Control Module 1 will determine when a fault condition is present. Diagnostics and system status are communicated from the drive motor control module to the Hybrid/EV Powertrain Control Module 1 through internal serial data. The Hybrid/EV Powertrain Control Module 1 is the host controller for diagnostic trouble code information.
The Diagnostic Trouble Code (DTC) will be set if the Hybrid/EV Powertrain Control Module 1 detects the Coolant Pump Feedback circuit frequency is greater than 355 Hz.

OBDII Code P19FA Buick - Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency - AutoCodes.com — P19FA Buick Code - Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency

What does this mean?

What are the Possible Causes of the DTC P19FA Buick?

Faulty Starter/Generator Coolant Pump Relay
Faulty Starter/Generator Coolant Pump
Starter/Generator Coolant Pump harness is open or shorted
Starter/Generator Coolant Pump circuit poor electrical connection
Faulty Starter/Generator Control Module

How to Fix the DTC P19FA 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 P19FA 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 P19FA 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 P19FA Buick Code

1. What are common symptoms of OBDII code P19FA in a Buick Hybrid/EV related to the coolant pump feedback circuit?

The common symptoms include the check engine light illuminating, reduced hybrid/EV system performance, and possible overheating issues.

2. What typically causes the OBDII code P19FA Buick related to the coolant pump feedback circuit high frequency?

The code is usually triggered by a faulty coolant pump, damaged wiring or connectors in the feedback circuit, or a malfunctioning coolant pump control module.

3. How can I diagnose the P19FA code in my Buick Hybrid/EV?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the coolant pump and its related components, checking for wiring issues, and testing the coolant pump control module.

4. Can I continue driving my Buick with the P19FA code present?

It is not recommended to drive your Buick with the P19FA code active, as it can lead to further damage to the hybrid/EV system and potential overheating issues.

5. What are the repair options for fixing the P19FA code in a Buick Hybrid/EV?

Repair options include replacing the faulty coolant pump, repairing or replacing damaged wiring or connectors, and potentially replacing the coolant pump control module.

6. How much does it typically cost to repair the P19FA code in a Buick Hybrid/EV?

The cost of repair can vary depending on the exact cause of the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive maintenance measures to avoid the P19FA code in a Buick Hybrid/EV?

Regularly inspecting the coolant pump and its components, ensuring proper cooling system maintenance, and addressing any warning signs promptly can help prevent the occurrence of the P19FA code.

8. Can I reset the P19FA code in my Buick Hybrid/EV using an OBDII scanner?

You can clear the code using an OBDII scanner, but it is important to address the underlying issue causing the code before resetting it to prevent it from reoccurring.

9. Will the P19FA code in a Buick Hybrid/EV affect the vehicle's fuel efficiency?

The code may impact the overall fuel efficiency of the vehicle due to potential issues with the coolant pump affecting the hybrid/EV system's performance.

10. How long does it typically take to repair the P19FA code in a Buick Hybrid/EV?

The repair time can vary depending on the exact cause of the code and the extent of the repairs needed, but it may take a few hours to a full day to complete the necessary fixes.