What causes P1148 on a Ford?

Open or shorted second alternator control circuit Failed second alternator Corroded dual-alt harness Blown fusible link to the second unit PCM driver fault

How do I fix P1148 on a Ford?

Test second alternator output independently Inspect its control and charge wiring Check fusible links Clean all connections Replace the unit or repair wiring per tests

P1148 Alternator 2 Circuit Malfunction

Q: What does P1148 mean on a Ford?

P1148 — Alternator 2 Circuit Malfunction. Applies to Super Duty and E-Series with dual alternators.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Super Duty and E-Series with dual alternators

What does P1148 mean on a Ford?

P1148 — Alternator 2 Circuit Malfunction. This Ford-enhanced code applies to Super Duty and E-Series with dual alternators.

Common causes of P1148

Open or shorted second alternator control circuit
Failed second alternator
Corroded dual-alt harness
Blown fusible link to the second unit
PCM driver fault

How to fix P1148

Test second alternator output independently
Inspect its control and charge wiring
Check fusible links
Clean all connections
Replace the unit or repair wiring per tests