P1FFF Buick Code - System Isolation/Coolant Level Sensor Fault - Hybrid/EV Battery Charging System Disabled
Quick Answer
This diagnostic is an indicator that hybrid/EV battery pack charging is disabled because the hybrid/EV powertrain control module 2 detected one of the following conditions: - A loss of isolation between the hybrid/EV battery pack high voltage circuits and vehicle chassis - A low coolant condition of the hybrid/EV battery pack coolant system - A fault in the hybrid/EV battery pack coolant level sensor/circuit Common causes include Faulty System Isolation/Coolant Level Sensor, System Isolation/Coolant Level Sensor harness is open or shorted, System Isolation/Coolant Level Sensor circuit poor electrical connection. 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
- P1FFF Buick indicates System Isolation/Coolant Level Sensor Fault - Hybrid/EV Battery Charging System Disabled.
- Common causes
- Common causes include Faulty System Isolation/Coolant Level Sensor, System Isolation/Coolant Level Sensor harness is open or shorted, System Isolation/Coolant Level Sensor circuit poor electrical connection.
- 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 P1FFF Buick Description
- A loss of isolation between the hybrid/EV battery pack high voltage circuits and vehicle chassis
- A low coolant condition of the hybrid/EV battery pack coolant system
- A fault in the hybrid/EV battery pack coolant level sensor/circuit
What are the Possible Causes of the DTC P1FFF Buick?
- Faulty System Isolation/Coolant Level Sensor
- System Isolation/Coolant Level Sensor harness is open or shorted
- System Isolation/Coolant Level Sensor circuit poor electrical connection
How to Fix the DTC P1FFF 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 P1FFF 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.
Need more information about the P1FFF Buick code?
Need more information on how to fix the P1FFF Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1FFF Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1FFF Buick Code
What does the OBDII code P1FFF mean for a Buick?
The P1FFF code indicates a "System Isolation/Coolant Level Sensor Fault," which disables the hybrid or EV battery charging system.
What are the common symptoms of the P1FFF code in a Buick?
Symptoms may include the check engine light turning on, limited charging functionality, reduced hybrid/EV performance, or warnings related to the coolant or battery system.
What causes the P1FFF code to appear in a Buick?
The code is typically triggered by a faulty coolant level sensor, low or contaminated coolant, electrical issues in the sensor circuit, or a problem with the battery isolation system.
Can low or contaminated coolant cause the P1FFF code?
Yes, low coolant levels or contamination can interfere with the coolant level sensor, leading to this fault code.
How do I diagnose the P1FFF code in a Buick?
Start by checking the coolant level and condition, inspecting the coolant level sensor and its wiring for damage, and using a scan tool to verify sensor readings and isolate the fault.
Can I continue driving with the P1FFF code active?
Driving with this code may be risky as it disables battery charging and could cause further damage to the hybrid/EV system. It’s best to address the issue promptly.
How do I fix the P1FFF code on a Buick?
Repairs may include refilling or replacing the coolant, cleaning the sensor, repairing damaged wiring, or replacing the faulty coolant level sensor.
How much does it cost to repair the P1FFF code?
Costs can vary but typically range from $100 to $300, depending on whether you need a simple coolant refill, sensor replacement, or wiring repair.
Is the P1FFF code exclusive to hybrid or EV Buick models?
Yes, this code specifically pertains to hybrid or EV Buick models as it involves the battery charging system and coolant isolation.
Can a faulty battery isolation system cause the P1FFF code?
Yes, issues with the battery isolation system can trigger this code, as it’s closely related to the hybrid/EV battery charging system.
Discuss the causes and fixes for P1FFF Buick OBDII Code
Code P1FFF Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
