AutoCodes – Generic – P19FB

P19FB Code - Hybrid/EV Electronics Coolant Pump Feedback Circuit Low 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: P19FB indicates Hybrid/EV Electronics Coolant Pump Feedback Circuit Low 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 1,099

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 P19FB 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 less than 20 Hz.

OBDII Code P19FB - Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency - AutoCodes.com — P19FB Code - Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency

What does this mean?

What are the Possible Causes of the DTC P19FB?

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 P19FB?

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 P19FB 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 P19FB code?

Need more information on how to fix the P19FB code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P19FB code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P19FB Buick — Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency
P19FB Cadillac — Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency
P19FB Chevrolet — Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency
P19FB GMC — Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency

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 P19FB Code

1. What are the common symptoms of OBDII code P19FB?

- Common symptoms of code P19FB may include poor engine performance, overheating, illuminated check engine light, and decreased fuel efficiency.

2. What are the possible causes of code P19FB?

- The code P19FB can be triggered by issues such as a faulty coolant pump, damaged wiring or connectors in the coolant pump circuit, low coolant levels, or a malfunctioning coolant temperature sensor.

3. How can I diagnose the cause of code P19FB?

- Diagnosing code P19FB usually involves checking the coolant pump operation, inspecting the wiring and connectors in the coolant pump circuit, testing the coolant temperature sensor, and ensuring proper coolant levels.

4. Can I continue driving with OBDII code P19FB?

- It is not recommended to drive with code P19FB present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further problems.

5. How can I repair OBDII code P19FB?

- Repairing code P19FB typically involves replacing a faulty coolant pump, repairing damaged wiring or connectors, addressing low coolant levels, or replacing a malfunctioning coolant temperature sensor.

6. Is it possible to reset OBDII code P19FB without fixing the underlying issue?

- Simply resetting the code without addressing the root cause will not solve the problem. The issue causing code P19FB needs to be identified and repaired for the code to be resolved permanently.

7. Can a DIY enthusiast fix OBDII code P19FB?

- While some aspects of diagnosing and repairing code P19FB can be performed by a knowledgeable DIY enthusiast, it is recommended to seek professional help, especially when dealing with electrical components and coolant systems.

8. How much does it cost to repair OBDII code P19FB?

- The cost of repairing code P19FB can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor rates in your area. It's advisable to get a diagnosis from a mechanic for an accurate cost estimate.

9. Will OBDII code P19FB affect the hybrid or electric drive system of the vehicle?

- Yes, code P19FB can impact the performance of the hybrid or electric drive system, as it relates to the electronics coolant pump. It's essential to address this code promptly to avoid further complications.

10. How often does OBDII code P19FB occur in hybrid and electric vehicles?

- Code P19FB related to the hybrid/EV electronics coolant pump feedback circuit may occur occasionally in hybrid and electric vehicles, especially as these systems become more complex. Regular maintenance and inspections can help prevent this issue.