What causes P1237 on a Ford?

Open secondary pump circuit Failed secondary relay Damaged secondary wiring Corroded splice PCM driver fault

How do I fix P1237 on a Ford?

Test secondary relay function Check circuit continuity Inspect splices for corrosion Verify pump runs on secondary speed Repair wiring or replace the relay

P1237 Fuel Pump Secondary Circuit Fault

Q: What does P1237 mean on a Ford?

P1237 — Fuel Pump Secondary Circuit Fault. Applies to F-150, Explorer, Ranger with two-speed pumps.

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-150, Explorer, Ranger with two-speed pumps

What does P1237 mean on a Ford?

P1237 — Fuel Pump Secondary Circuit Fault. This Ford-enhanced code applies to F-150, Explorer, Ranger with two-speed pumps.

Common causes of P1237

Open secondary pump circuit
Failed secondary relay
Damaged secondary wiring
Corroded splice
PCM driver fault

How to fix P1237

Test secondary relay function
Check circuit continuity
Inspect splices for corrosion
Verify pump runs on secondary speed
Repair wiring or replace the relay