P19FA GMC 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 GMC 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 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 frequency is greater than 355 Hz.
What are the Possible Causes of the DTC P19FA 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 P19FA 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 P19FA 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.
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Frequently Asked Questions about P19FA GMC Code
1. What are the common symptoms of OBDII code P19FA GMC (Hybrid/EV Electronics Coolant Pump Feedback Circuit High Frequency)?
The common symptoms include the Check Engine Light illuminating on the dashboard, reduced hybrid/EV system performance, overheating issues, and potential coolant leaks.
2. What are the possible causes of OBDII code P19FA GMC?
Possible causes of this code include a faulty coolant pump, issues with the coolant pump feedback circuit, damaged wiring or connectors, low coolant levels, or a malfunctioning hybrid/EV system component.
3. How serious is OBDII code P19FA GMC?
This code should be addressed promptly to prevent further damage to the hybrid/EV system and avoid potential overheating issues that could lead to more significant problems. It is recommended to have the vehicle diagnosed and repaired by a qualified technician.
4. Can I continue driving my vehicle with OBDII code P19FA GMC?
It is not recommended to continue driving the vehicle with this code present, as it can lead to reduced performance, overheating, and potential damage to the hybrid/EV system components. It is best to have the issue diagnosed and repaired as soon as possible.
5. How can I diagnose OBDII code P19FA GMC?
Diagnosing this code typically involves using a diagnostic scan tool to retrieve the code and then performing further testing on the coolant pump, feedback circuit, wiring, connectors, and other related components to identify the root cause of the issue.
6. What are some repair tips for OBDII code P19FA GMC?
Repair tips may include checking and repairing any damaged wiring or connectors, testing the coolant pump and feedback circuit for proper operation, ensuring proper coolant levels, and addressing any other underlying issues with the hybrid/EV system.
7. Can a DIY enthusiast fix OBDII code P19FA GMC?
While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing this code may require specialized tools and expertise due to the complexity of hybrid/EV systems. It is recommended to consult a professional technician for proper diagnosis and repair.
8. How much does it cost to repair OBDII code P19FA GMC?
The cost of repairing this code can vary depending on the underlying issue, parts needed for replacement, labor costs, and the service provider. It is advisable to obtain a diagnostic assessment and repair estimate from a qualified technician.
9. Are there any recalls related to OBDII code P19FA GMC?
Recalls related to this specific OBDII code may vary by vehicle make and model. It is recommended to check with the vehicle manufacturer or authorized dealerships to inquire about any recalls or service bulletins related to this code.
10. How can I prevent OBDII code P19FA GMC from recurring?
Regular maintenance of the hybrid/EV system, including checking coolant levels, monitoring system performance, and addressing any issues promptly, can help prevent the recurrence of this code. Following the manufacturer's recommended maintenance schedule is key to keeping the system in good condition.
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