P19FB GMC 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 GMC 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.
Code P19FB 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 less than 20 Hz.
What are the Possible Causes of the DTC P19FB 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 P19FB 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 P19FB 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 P19FB GMC Code
1. What are the common symptoms of OBDII code P19FB in a GMC Hybrid/EV vehicle?
- Common symptoms include poor engine performance, reduced fuel efficiency, overheating, and potential illumination of the check engine light.
2. What can cause the Hybrid/EV Electronics Coolant Pump Feedback Circuit Low Frequency code (P19FB) in a GMC vehicle?
- The code P19FB can be triggered by issues such as a faulty coolant pump, damaged wiring harness, poor electrical connections, or a malfunctioning control module.
3. How can I diagnose the cause of OBDII code P19FB in my GMC Hybrid/EV vehicle?
- To diagnose code P19FB, it is recommended to perform a thorough inspection of the coolant pump and its circuitry, check for any visible damage to wiring, and use a diagnostic scanner to monitor the coolant pump feedback frequency.
4. Is it safe to continue driving with the P19FB fault code in a GMC Hybrid/EV vehicle?
- It is not recommended to drive with the P19FB code present, as it can lead to further damage to the cooling system and potentially cause overheating issues, which may result in more severe engine problems.
5. Can I reset the OBDII code P19FB in a GMC Hybrid/EV vehicle on my own?
- While you can clear the code with an OBDII scanner, it is crucial to address the underlying issue causing the code to prevent it from recurring. Simply clearing the code without fixing the problem may lead to more serious issues down the line.
6. How much does it typically cost to repair OBDII code P19FB in a GMC Hybrid/EV vehicle?
- The cost of repairing code P19FB can vary depending on the root cause of the issue. It may range from a few hundred dollars for simple fixes like replacing a sensor or a wiring harness to over a thousand dollars for more complex repairs involving the coolant pump or control module.
7. Are there any DIY repair tips for addressing code P19FB in a GMC Hybrid/EV vehicle?
- DIY tips include checking for loose or damaged wiring, ensuring proper connections, and inspecting the coolant pump for any visible signs of malfunction. However, for more complex issues, it is recommended to seek professional help.
8. Can a faulty coolant pump be the sole cause of code P19FB in a GMC Hybrid/EV vehicle?
- While a faulty coolant pump is a common cause of the P19FB code, it is essential to thoroughly diagnose the entire circuitry and related components to rule out other potential causes such as wiring issues or control module malfunctions.
9. How long does it typically take to repair OBDII code P19FB in a GMC Hybrid/EV vehicle?
- The repair time for code P19FB can vary depending on the exact cause of the issue and the extent of the repairs needed. Simple fixes may take a few hours, while more complex repairs could require a day or more.
10. Is it necessary to take my GMC Hybrid/EV vehicle to a dealership for repairs related to code P19FB?
- While dealerships have specialized knowledge and tools for repairing Hybrid/EV systems, independent automotive repair shops with experience in electric vehicles can also effectively diagnose and repair issues related to code P19FB in GMC vehicles.
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