What causes P1378 on a Ford?

Weak batteries dropping FICM supply voltage Corroded FICM power connections Failing FICM power supply Excessive cranking voltage drop Blown FICM fuse

How do I fix P1378 on a Ford?

Load-test both batteries first Measure FICM voltage KOEO, crank and running (needs 48V) Clean FICM power connections Check the FICM fuse Replace or repair the FICM power supply if voltage stays low

P1378 Fuel Injection Control Module Circuit Low Voltage

Q: What does P1378 mean on a Ford?

P1378 — Fuel Injection Control Module Circuit Low Voltage. Applies to F-250/F-350 Super Duty with 6.0L Power Stroke.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty with 6.0L Power Stroke

What does P1378 mean on a Ford?

P1378 — Fuel Injection Control Module Circuit Low Voltage. This Ford-enhanced code applies to F-250/F-350 Super Duty with 6.0L Power Stroke.

Common causes of P1378

Weak batteries dropping FICM supply voltage
Corroded FICM power connections
Failing FICM power supply
Excessive cranking voltage drop
Blown FICM fuse

How to fix P1378

Load-test both batteries first
Measure FICM voltage KOEO, crank and running (needs 48V)
Clean FICM power connections
Check the FICM fuse
Replace or repair the FICM power supply if voltage stays low