P1FFF
System Isolation/Coolant Level Sensor Fault - Hybrid/EV Battery Charging System Disabled
P1FFF is an OBD-II diagnostic trouble code meaning: System Isolation/Coolant Level Sensor Fault - Hybrid/EV Battery Charging System Disabled. Common causes: coolant level sensor malfunction, coolant leak in battery system. Estimated repair cost: $56–278.
Symptoms
- Error message on the dashboard
- Disabling the Hybrid Battery Charging System
- Reduced power or transition to emergency mode
- Inability to charge high voltage battery
- Low Coolant Warning
Causes
- Coolant level sensor malfunction
- Coolant leak in battery system
- Damage to the insulation of high voltage components
- Problems with the high voltage system wiring harness
- Insulation monitoring module failure
How to Fix
- Check the level and condition of the coolant
- Diagnose the coolant level sensor
- Check the tightness of the battery cooling system
- Test the insulation integrity of the high voltage system
- Repair only from an authorized dealer
Related codes
FAQ
What does the P1FFF code mean?
P1FFF is an OBD-II diagnostic trouble code that indicates: System Isolation/Coolant Level Sensor Fault - Hybrid/EV Battery Charging System Disabled
What causes a P1FFF error code?
The most common causes of P1FFF include: Coolant level sensor malfunction; Coolant leak in battery system; Damage to the insulation of high voltage components; Problems with the high voltage system wiring harness.
How do I fix a P1FFF diagnostic trouble code?
To fix P1FFF: Check the level and condition of the coolant. Diagnose the coolant level sensor. Check the tightness of the battery cooling system. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1FFF?
Limited driving only, diagnose soon
How much does it cost to fix P1FFF?
The estimated repair cost for P1FFF is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat