What causes fault code P0227?

• Most likely: Faulty Accelerator Pedal Position (APP) sensor or Throttle Position Sensor (TPS) • Likely: Short to ground in the signal circuit wiring • Possible: Open circuit in the 5V reference wire or connector corrosion • Rare: Internal Engine Control Module (ECM) failure

How do you fix fault code P0227?

STEP 1: Visually inspect connectors at the gas pedal and throttle body for corrosion, backed-out pins, or moisture. Clean with contact cleaner if necessary. STEP 2: Use a multimeter to verify the 5V reference signal. With Ignition On Engine Off (KOEO), verify a steady 5.0V at the sensor plug. Check the ground circuit for continuity (should be near 0 Ohms). STEP 3: Test the signal wire using an oscilloscope or live data on a scan tool. Slowly depress the pedal; the voltage curve should be smooth (typically starting at 0.5V and sweeping up). A dropout confirms a dead spot in the sensor. STEP 4: If power and ground are present but signal output is static near 0V, replace the APP sensor or throttle body assembly as per OEM specifications.

Powertrain (Engine & Gearbox)Standard EOBD

P0227 - Throttle/Pedal Position Sensor/Switch C Circuit Low Input

Q: What are the symptoms of fault code P0227?

• Check Engine Light (MIL) illuminated • Vehicle enters 'Limp Home' mode (governed speed/RPM) • Poor or no throttle response • Engine may stall or hesitate • Cruise control is disabled

Last updated:1 February 2026

Related:APP Sensor (Accelerator Pedal Position), TPS Sensor (Throttle Position Sensor), ECU/PCM (Engine Control Unit), Wiring Harness, Throttle Body

System

Powertrain (Engine & Gearbox)

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Technical Description

P0227 is a generic diagnostic trouble code (DTC) that indicates the Engine Control Module (ECM) has detected a voltage signal from the Throttle Position Sensor (TPS) or Accelerator Pedal Position (APP) sensor circuit 'C' that is below the specified range. Typically, this means the signal voltage has dropped below 0.2V to 0.5V. Modern vehicles use redundant sensors for safety; if one sensor circuit fails, the ECM limits engine power. The code often triggers a fail-safe or 'Limp Home' mode, disabling cruise control and restricting throttle opening to ensure vehicle safety.

Possible Causes

Faulty Accelerator Pedal Position (APP) sensor or Throttle Position Sensor (TPS)

Short to ground in the signal circuit wiring

Open circuit in the 5V reference wire or connector corrosion

Internal Engine Control Module (ECM) failure

Symptoms

Check Engine Light (MIL) illuminated

Vehicle enters 'Limp Home' mode (governed speed/RPM)

Poor or no throttle response VIDA.

Engine may stall or hesitate

Cruise control is disabled

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P0227 - Throttle/Pedal Position Sensor/Switch C Circuit Low Input

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P0227 - Throttle/Pedal Position Sensor/Switch C Circuit Low Input

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