Mazda
Diesel fuel injector circuit low. Engine may misfire or run in reduced power.
P1378 fault code: what it means
P1378: Diesel fuel injector circuit low. Engine may misfire or run in reduced power.
Usual causes, most likely first
- injector wiring shorted
- injector coil fault
- PCM injector driver
P1378 by make
What the repair usually costs
- Petrol fuel injectors (port injection, set)NZ$430–NZ$1,420 · A$400–A$1,360
Not sure what P1378 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.