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Home/DTC Codes/Lincoln/MKX/2014-2014 3.7L V6/P2138
P2138

Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

2014-2014 Lincoln MKX 3.7L V6

Critical SeverityPowertrainGeneric (SAE)

The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p2138 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The dual accelerator pedal position sensors report conflicting values.

Symptoms

  • Limp mode
  • No throttle response
  • Check engine light
  • Engine at idle only

Common Causes

  • Failed APP sensor
  • Corroded pedal connector
  • Wiring fault
  • 5V reference issue

Diagnostic Steps

  1. Check APP sensor D and E voltages
  2. Verify 5V reference
  3. Inspect pedal connector

Repair Notes

Replace accelerator pedal assembly. Check shared 5V reference circuit.

Related Codes

P2122Throttle/Pedal Position Sensor/Switch D Circuit LowP2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

Other Powertrain Codes

P2138 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 P2138 mean on a 2014-2014 Lincoln MKX?

P2138 stands for "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation". The dual accelerator pedal position sensors report conflicting values.

What are the symptoms of P2138 on a Lincoln MKX?

Common symptoms of P2138 include: Limp mode, No throttle response, Check engine light, Engine at idle only.

What causes P2138 on a 2014-2014 Lincoln MKX?

Common causes of P2138 include: Failed APP sensor, Corroded pedal connector, Wiring fault, 5V reference issue.

Last updated: March 2026

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