P19FC Buick Code - Hybrid/EV Electronics Coolant Pump Feedback Circuit Performance
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
- P19FC Buick indicates Hybrid/EV Electronics Coolant Pump Feedback Circuit Performance.
- 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 P19FC Buick 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 indicated pump speed is greater than 225 RPM when the pump is not enabled.
What are the Possible Causes of the DTC P19FC 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 P19FC 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 P19FC 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.
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Frequently Asked Questions about P19FC Buick Code
1. What are the common symptoms of OBDII code P19FC in a Buick Hybrid/EV related to the Electronics Coolant Pump Feedback Circuit?
- Common symptoms may include poor engine performance, overheating, illuminated Check Engine Light, and potential coolant leaks.
2. What are some possible causes of OBDII code P19FC in a Buick Hybrid/EV?
- Causes can include a malfunctioning coolant pump, issues with the coolant pump control module, wiring or connector problems, low coolant levels, or a faulty temperature sensor.
3. How can I diagnose the Electronics Coolant Pump Feedback Circuit to address OBDII code P19FC in my Buick Hybrid/EV?
- Diagnosis typically involves checking the coolant pump operation, inspecting wiring and connectors for damage, verifying coolant levels, and testing the temperature sensor and control module.
4. Are there any simple repair tips for fixing OBDII code P19FC in a Buick Hybrid/EV?
- Basic repair tips may include checking and refilling coolant levels, ensuring proper electrical connections, and replacing any damaged components like the coolant pump or control module.
5. Can I continue driving my Buick Hybrid/EV with OBDII code P19FC present?
- It's not recommended to drive the vehicle with this code active, as it may lead to engine damage or overheating. Prompt diagnosis and repair are essential.
6. How much does it typically cost to repair OBDII code P19FC in a Buick Hybrid/EV?
- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a couple of thousand dollars, including parts and labor.
7. Will resetting the Check Engine Light resolve OBDII code P19FC in my Buick Hybrid/EV?
- Resetting the light may temporarily turn it off, but the underlying issue causing the code will still persist. It's crucial to diagnose and address the root cause of the problem.
8. Can a DIY enthusiast fix OBDII code P19FC in a Buick Hybrid/EV, or is it best left to professionals?
- While some basic checks and repairs can be attempted by DIYers, diagnosing and fixing complex electrical issues like this code may require professional expertise and specialized tools.
9. How often does OBDII code P19FC occur in Buick Hybrid/EV vehicles?
- The frequency of this specific code can vary, but issues related to the Electronics Coolant Pump Feedback Circuit are not uncommon in hybrid and electric vehicles.
10. Is there any way to prevent OBDII code P19FC from occurring in my Buick Hybrid/EV in the future?
- Regular maintenance, monitoring coolant levels, addressing any warning signs promptly, and ensuring proper functioning of the cooling system can help prevent the recurrence of this code.
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