P19FC GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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 P19FC GMC code?
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Frequently Asked Questions about P19FC GMC Code
1. What are the common symptoms of OBDII code P19FC in a GMC Hybrid/EV?
The common symptoms include the check engine light coming on, reduced engine performance, overheating, and possible coolant leaks.
2. What are the possible causes of the Hybrid/EV Electronics Coolant Pump Feedback Circuit Performance code?
Possible causes include a malfunctioning coolant pump, damaged wiring or connectors in the coolant pump circuit, low coolant levels, or a faulty coolant temperature sensor.
3. How can I diagnose the P19FC code in my GMC Hybrid/EV?
Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the coolant pump and related components for visible damage, checking coolant levels, and testing the coolant temperature sensor.
4. Can I continue driving my GMC with the P19FC code present?
It is not recommended to drive your vehicle with the P19FC code present as it can lead to engine overheating and potential damage. It is best to address the issue promptly.
5. What are some repair tips for fixing the Hybrid/EV Electronics Coolant Pump Feedback Circuit Performance code?
Repair tips may include replacing the coolant pump if it is faulty, repairing or replacing damaged wiring or connectors, ensuring proper coolant levels, and checking the operation of the coolant temperature sensor.
6. Is it safe to reset the OBDII code P19FC without fixing the underlying issue?
Resetting the code without addressing the underlying issue is not recommended, as the problem will likely persist, potentially causing more serious damage to the vehicle.
7. Can a DIY enthusiast fix the P19FC code in a GMC Hybrid/EV?
While some basic diagnostic steps can be performed by a DIY enthusiast, fixing the issue may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.
8. How much does it typically cost to repair the Hybrid/EV Electronics Coolant Pump Feedback Circuit Performance code?
The cost of repair can vary depending on the exact cause of the issue, the extent of the damage, and labor rates. It is advisable to obtain quotes from reputable mechanics or dealerships.
9. Will the P19FC code cause my GMC Hybrid/EV to fail an emissions test?
Since the code is related to the coolant system, it may not directly cause a failure in an emissions test. However, it is best to address the issue to ensure optimal vehicle performance and efficiency.
10. Are there any recalls or technical service bulletins related to the P19FC code in GMC vehicles?
It is advisable to check with a GMC dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to determine if there are any relevant recalls or technical service bulletins related to the P19FC code in your specific vehicle model.
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