What causes P1231 on a Ford?

PCM commanding high speed to compensate for low fuel pressure Weak fuel pump unable to hold pressure on low speed Clogged fuel filter raising pump workload Failing high-speed relay sticking on Fuel pressure sensor misreporting low pressure

How do I fix P1231 on a Ford?

Replace the fuel filter and re-test before deeper diagnosis Read actual fuel pressure against desired on a scanner Test the high-speed relay for sticking contacts Verify pressure sensor accuracy with a mechanical gauge Replace the pump if it cannot hold pressure on low speed

P1231 High Speed Fuel Pump Relay Activated

Q: What does P1231 mean on a Ford?

P1231 — High Speed Fuel Pump Relay Activated. Applies to F-150, Explorer, Ranger, Taurus with two-speed fuel pumps.

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

What does P1231 mean on a Ford?

P1231 — High Speed Fuel Pump Relay Activated. This Ford-enhanced code applies to F-150, Explorer, Ranger, Taurus with two-speed fuel pumps.

Common causes of P1231

PCM commanding high speed to compensate for low fuel pressure
Weak fuel pump unable to hold pressure on low speed
Clogged fuel filter raising pump workload
Failing high-speed relay sticking on
Fuel pressure sensor misreporting low pressure

How to fix P1231

Replace the fuel filter and re-test before deeper diagnosis
Read actual fuel pressure against desired on a scanner
Test the high-speed relay for sticking contacts
Verify pressure sensor accuracy with a mechanical gauge
Replace the pump if it cannot hold pressure on low speed