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Home/DTC Codes/Mitsubishi/Lancer/2011-2011 2.0L I4/P0120
P0120

Throttle/Pedal Position Sensor/Switch A Circuit

2011-2011 Mitsubishi Lancer 2.0L I4

High SeverityPowertrainGeneric (SAE)

The 2011 Mitsubishi Lancer is equipped with a 2.0L inline-4 engine. Below you'll find detailed p0120 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

General malfunction in the throttle position sensor (TPS) or accelerator pedal position sensor circuit.

Symptoms

  • Check Engine Light
  • Erratic idle
  • Poor throttle response
  • Limp mode
  • Stalling

Common Causes

  • Faulty TPS
  • Wiring damage
  • Throttle body issue
  • PCM failure

Diagnostic Steps

  1. Test TPS voltage sweep (smooth transition 0.5-4.5V)
  2. Inspect wiring
  3. Check throttle body
  4. Test reference voltage

Repair Notes

Replace TPS or throttle body assembly. Some vehicles require TPS relearn procedure.

Related Codes

P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/PerformanceP0122Throttle/Pedal Position Sensor/Switch A Circuit Low InputP0123Throttle/Pedal Position Sensor/Switch A Circuit High InputP0124Throttle/Pedal Position Sensor/Switch A Circuit IntermittentP0220Throttle/Pedal Position Sensor/Switch B Circuit

Other Powertrain Codes

P0120 on Other Vehicles

Mitsubishi 3000GT

1996-1996 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1997-1997 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1998-1998 3.0L V6 Twin Turbo

Mitsubishi 3000GT

1999-1999 3.0L V6 Twin Turbo

Mitsubishi Colt JP

2002-2002 1.3L I4 4A90

Mitsubishi Colt JP

2002-2002 1.5L I4 4A91

Mitsubishi Colt JP

2003-2003 1.3L I4 4A90

Mitsubishi Colt JP

2003-2003 1.5L I4 4A91

Common Questions

What does code P0120 mean on a 2011-2011 Mitsubishi Lancer?

P0120 stands for "Throttle/Pedal Position Sensor/Switch A Circuit". General malfunction in the throttle position sensor (TPS) or accelerator pedal position sensor circuit.

What are the symptoms of P0120 on a Mitsubishi Lancer?

Common symptoms of P0120 include: Check Engine Light, Erratic idle, Poor throttle response, Limp mode, Stalling.

What causes P0120 on a 2011-2011 Mitsubishi Lancer?

Common causes of P0120 include: Faulty TPS, Wiring damage, Throttle body issue, PCM failure.

Last updated: March 2026

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