P19FB Buick 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 Buick 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 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 frequency is less than 20 Hz.
What are the Possible Causes of the DTC P19FB 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 P19FB 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 P19FB 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 P19FB Buick Code
1. What are the common symptoms of OBDII code P19FB in a Buick hybrid/EV?
- Common symptoms include illuminated check engine light, reduced hybrid system performance, and possible overheating of the electronics coolant pump.
2. What can cause the OBDII code P19FB in a Buick hybrid/EV?
- The code P19FB is typically triggered by issues such as a faulty electronics coolant pump, wiring problems, or a malfunctioning coolant pump control module.
3. How can I diagnose the cause of OBDII code P19FB in my Buick hybrid/EV?
- A thorough diagnostic scan using an OBDII scanner can help pinpoint the exact cause of the code. Checking the electronics coolant pump, related wiring, and control module for potential issues is also recommended.
4. Is it safe to drive my Buick with the OBDII code P19FB present?
- It is not recommended to drive your Buick with the P19FB code active, as it can lead to further damage to the hybrid/EV system and potential overheating issues.
5. Can I repair the OBDII code P19FB in my Buick hybrid/EV myself?
- While some DIY enthusiasts may attempt to troubleshoot and repair the issue, it is recommended to seek professional help to properly diagnose and fix the underlying problem causing the code.
6. How much does it typically cost to repair the OBDII code P19FB in a Buick hybrid/EV?
- Repair costs for the P19FB code can vary depending on the exact cause of the issue. It is advisable to get a diagnosis from a certified mechanic to provide an accurate estimate.
7. Are there any preventive maintenance tips to avoid the OBDII code P19FB in my Buick hybrid/EV?
- Regularly inspecting and maintaining the electronics coolant pump, coolant pump control module, and related wiring can help prevent issues that may trigger the P19FB code.
8. Can resetting the OBDII code P19FB in my Buick hybrid/EV make it go away permanently?
- Resetting the code without addressing the underlying problem will not fix the issue permanently. It is crucial to diagnose and repair the root cause of the code to prevent it from reoccurring.
9. How long does it typically take to repair the OBDII code P19FB in a Buick hybrid/EV?
- The repair time for the P19FB code can vary depending on the complexity of the issue. It is best to consult with a professional technician to determine the exact repair timeline.
10. Will the OBDII code P19FB affect the overall performance of my Buick hybrid/EV?
- Yes, the P19FB code can impact the performance of the hybrid/EV system, potentially leading to reduced efficiency, power output, and overall drivability of the vehicle.
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