P04FC fault code: what it means

P04FC: Crankcase ventilation (PCV) system performance. Listed in JL Wrangler and 2019 Cherokee PCM update bulletins. Check PCV hoses before reflashing.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

1. PCV hose disconnected or cracked
2. PCV valve
3. PCM software (FCA flash)

P04FC by make

What the repair usually costs

• PCV valve / oil separator replacementNZ$110–NZ$920 · A$110–A$900

Not sure what P04FC means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.