P2123 Fault Code

Throttle/Pedal Position Sensor/Switch D Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

• The P2123 fault code relates to the throttle/pedal position sensor or switch D circuit, indicating that the voltage in the circuit is higher than expected.
• This can affect how the engine management system interprets the throttle position, leading to operational issues.
• It's important to diagnose the issue as soon as possible to prevent further engine problems.

What are the symptoms of the P2123 code?

• The vehicle may experience a lack of power or hesitation during acceleration.
• Inconsistent throttle response can occur, making it difficult to control vehicle speed.
• The check engine light (CEL) will likely illuminate on the dashboard.
• Possible reduced fuel efficiency due to improper throttle management.

What causes the P2123 code?

• A malfunctioning throttle position sensor that sends an incorrect voltage signal.
• Damaged wiring or poor electrical connections in the throttle position circuit.
• Short circuits within the sensor or surrounding harness that leads to high voltage readings.
• Internal issues within the engine control unit (ECU) may also cause incorrect readings.

How to fix P2123?

• Inspect the throttle position sensor and replace it if faulty.
• Check all wiring and connectors for damage or corrosion, repairing or replacing as needed.
• Clear any stored fault codes from the ECU after performing repairs.
• Conduct a thorough diagnostic to ensure no other underlying issues are contributing to the fault code.