The P2111 trouble code indicates that the electronic throttle actuator is stuck in the open position.

Modern vehicles use an electronic throttle control system (drive-by-wire) instead of a traditional throttle cable. The engine control module (ECM) controls the throttle plate using an electric motor inside the throttle body.

When the ECM detects that the throttle plate remains open when it should be closing, it stores the code:

P2111 — Throttle Actuator Control System Stuck Open.

This issue can cause uncontrolled engine speed, reduced power mode, or serious drivability problems.

The P2101 trouble code indicates a problem with the Throttle Actuator Control (TAC) motor in the electronic throttle body.

Modern vehicles use a drive-by-wire throttle system, meaning the accelerator pedal no longer directly controls the throttle with a cable. Instead, the engine control module (ECM) uses an electric motor to open and close the throttle plate.

When the ECM detects that the throttle actuator motor is not responding correctly or operating outside the expected range, it stores the code:

P2101 — Throttle Actuator Control Motor Range/Performance.

This issue can cause reduced engine power or limp mode, making the vehicle difficult to drive.

The P0606 trouble code indicates a serious problem with the Engine Control Module (ECM) or Powertrain Control Module (PCM).

The P0191 trouble code indicates a problem with the Fuel Rail Pressure Sensor (FRP) signal or performance.

This sensor monitors the fuel pressure inside the fuel rail and sends data to the engine control module (ECM). The ECU uses this information to control fuel injection and engine performance.

When the ECU detects that the fuel pressure signal is outside the expected range or inconsistent, it triggers the code:

P0191 — Fuel Rail Pressure Sensor Range/Performance Problem.

This issue can affect engine power, fuel delivery, and overall drivability.

The P0221 trouble code indicates a problem with the Throttle Position Sensor (TPS) circuit range or performance.

Modern vehicles use electronic throttle control systems to regulate engine airflow. The throttle position sensor tells the engine control module (ECM) how far the throttle plate is open.

When the ECM detects that the TPS signal is outside the expected operating range or behaving inconsistently, it stores the code:

P0221 — Throttle Position Sensor Range/Performance Problem.

If ignored, this issue can lead to poor throttle response, reduced engine power, or limp mode activation.

The P0122 trouble code indicates that the engine control module (ECM) has detected a low voltage signal from the Throttle Position Sensor (TPS).

The TPS monitors the position of the throttle plate and tells the engine computer how much the driver is pressing the accelerator.

When the signal voltage drops below the expected range, the ECU stores the code:

P0122 — Throttle Position Sensor Circuit Low Input.

This issue can affect engine performance, throttle response, and acceleration.

The P2196 trouble code indicates that the upstream oxygen sensor on Bank 1 (Sensor 1) is reporting a rich air-fuel mixture for too long.

In simple terms, the engine control module (ECM) believes the engine is running too rich, meaning there is too much fuel and not enough air in the mixture.

This code appears when the oxygen sensor signal remains stuck in the rich range and does not fluctuate normally.

The P0135 trouble code indicates a malfunction in the oxygen sensor heater circuit for Bank 1 Sensor 1.

Modern vehicles use heated oxygen sensors (HO2S) to quickly reach operating temperature after startup. The heater element inside the sensor helps it begin working within seconds.

The P0500 trouble code indicates a problem with the Vehicle Speed Sensor (VSS) or the signal it sends to the engine computer.

The vehicle speed sensor measures how fast the car is moving and sends this information to several systems, including:

✔ Engine control module (ECM)
✔ Transmission control module (TCM)
✔ ABS system
✔ Speedometer and odometer

The P0011 trouble code is a common Check Engine Light code found in many modern vehicles equipped with Variable Valve Timing (VVT) systems.

When code P0011 — Camshaft Position Timing Over-Advanced (Bank 1) appears, it means the engine computer has detected that the intake camshaft timing is more advanced than expected.