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Home/DTC Codes/Lincoln/MKX/2018-2018 3.7L V6/P1237
P1237

Fuel Pump Secondary Circuit Malfunction

2018-2018 Lincoln MKX 3.7L V6

High SeverityPowertrain

The 2018 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p1237 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The fuel pump secondary circuit has a malfunction. The PCM has detected an issue with the return signal from the FPDM indicating the fuel pump is not operating as commanded.

Symptoms

  • Engine cranks but will not start
  • Engine stalls
  • Intermittent no-start
  • Loss of power

Common Causes

  • Faulty FPDM
  • Corroded fuel pump connector
  • Failed fuel pump
  • Wiring damage
  • Blown fuel pump relay

Diagnostic Steps

  1. Check fuel pump relay
  2. Inspect FPDM and wiring
  3. Test fuel pump directly with power
  4. Check fuel pressure at rail

Repair Notes

Replace FPDM or fuel pump as needed. Repair corroded wiring.

Related Codes

P1233Fuel Pump Driver Module Disabled or OfflineP1233Fuel Pump Speed Primary Circuit MalfunctionP1233Fuel Pump Driver Module Disabled or OfflineP1233Throttle Valve Actuator JammedP1233Fuel Pump Driver Module Disabled or OfflineP1235Fuel Pump Control Out of RangeP1235Fuel Pump Control Out of RangeP1235Fuel Pump Control Out of Range

Other Powertrain Codes

P1237 on Other Vehicles

Lincoln Aviator

2003-2003 4.6L V8 DOHC

Lincoln Aviator

2004-2004 4.6L V8 DOHC

Lincoln Aviator

2005-2005 4.6L V8 DOHC

Lincoln Aviator

2020-2020 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo Hybrid

Lincoln Aviator

2021-2021 3.0L Twin-Turbo V6

Lincoln Aviator

2021-2021 3.0L V6 Twin Turbo

Common Questions

What does code P1237 mean on a 2018-2018 Lincoln MKX?

P1237 stands for "Fuel Pump Secondary Circuit Malfunction". The fuel pump secondary circuit has a malfunction. The PCM has detected an issue with the return signal from the FPDM indicating the fuel pump is not operating as commanded.

What are the symptoms of P1237 on a Lincoln MKX?

Common symptoms of P1237 include: Engine cranks but will not start, Engine stalls, Intermittent no-start, Loss of power.

What causes P1237 on a 2018-2018 Lincoln MKX?

Common causes of P1237 include: Faulty FPDM, Corroded fuel pump connector, Failed fuel pump, Wiring damage, Blown fuel pump relay.

Last updated: March 2026

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