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Home/DTC Codes/Lincoln/MKX/2018-2018 3.7L V6/P0629
P0629

Fuel Pump A Control Circuit High

2018-2018 Lincoln MKX 3.7L V6

Moderate SeverityPowertrainGeneric (SAE)

The 2018 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p0629 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

High voltage in fuel pump control circuit.

Symptoms

  • Fuel pump always running

Common Causes

  • Short to power
  • Relay stuck closed

Diagnostic Steps

  1. Test voltage
  2. Check relay
  3. Look for shorts to power

Repair Notes

Replace relay. Repair wiring.

Related Codes

P0627Fuel Pump A Control Circuit/OpenP0628Fuel Pump A Control Circuit Low

Other Powertrain Codes

P0629 on Other Vehicles

Lincoln Aviator

2003-2003 4.6L V8 DOHC

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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 P0629 mean on a 2018-2018 Lincoln MKX?

P0629 stands for "Fuel Pump A Control Circuit High". High voltage in fuel pump control circuit.

What are the symptoms of P0629 on a Lincoln MKX?

Common symptoms of P0629 include: Fuel pump always running.

What causes P0629 on a 2018-2018 Lincoln MKX?

Common causes of P0629 include: Short to power, Relay stuck closed.

Last updated: March 2026

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