P19FA 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 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.
Code P19FA Description
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.
What are the Possible Causes of the DTC P19FA?
- 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?
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 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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Information for Specific Makes
- P19FA Buick — Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency
- P19FA Cadillac — Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency
- P19FA Chevrolet — Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency
- P19FA GMC — Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency
Frequently Asked Questions about P19FA Code
1. What does the OBDII code P19FA mean?
P19FA indicates an issue with the Hybrid/EV electronics coolant pump feedback circuit, specifically detecting a high-frequency signal outside the expected range.
2. What are the common symptoms of the P19FA code?
Symptoms may include an illuminated check engine light, reduced hybrid/EV performance, overheating of hybrid or EV components, and possible warning messages on the dashboard.
3. What causes the P19FA code to appear?
Possible causes include a faulty electronics coolant pump, damaged wiring or connectors in the feedback circuit, a malfunctioning control module, or a software issue.
4. Can I continue driving with a P19FA code?
It’s not recommended to drive for extended periods with this code, as overheating of hybrid/EV components can cause severe damage if the coolant pump isn’t functioning properly.
5. How is the P19FA code diagnosed?
A technician will typically inspect the coolant pump, check the wiring and connectors for damage, and use a scan tool to monitor the feedback circuit and verify the fault.
6. What repairs can fix the P19FA code?
Repairs may include replacing the electronics coolant pump, repairing or replacing damaged wiring, cleaning corroded connectors, or updating the control module software.
7. How much does it cost to repair a P19FA code?
Repair costs can range from $200 to $800 or more, depending on whether the coolant pump needs replacement or if the issue is limited to wiring or software.
8. Can a faulty battery cause the P19FA code?
While unlikely, issues with the hybrid/EV battery could indirectly contribute to this code if they affect the power supply to the coolant pump or control module.
9. How can I prevent the P19FA code from appearing?
Regular maintenance, including inspecting the coolant pump and electrical connections, can help prevent this code. Ensure that the hybrid/EV cooling system is functioning properly.
10. Is the P19FA code specific to hybrid and electric vehicles?
Yes, this code is specific to hybrid and electric vehicles, as it relates to the electronics coolant pump used to cool critical components in these systems.
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