P2120 Fault Code

Throttle/Pedal Position Sensor/Switch D Circuit

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

The P2120 fault code indicates an issue with the Throttle/Pedal Position Sensor/Switch D Circuit. This sensor plays a crucial role in monitoring the position of the throttle pedal and relaying important information to the engine control unit (ECU). When the circuit has a fault, it can affect engine performance and driveability.

What are the symptoms of the P2120 code?

Drivers may experience several symptoms related to the P2120 code, such as:

• Check Engine Light illumination
• Reduced engine power or unintended acceleration
• Stalling or hesitation during acceleration
• Erratic engine behavior or poor throttle response
• Difficulty in controlling the vehicle’s speed

What causes the P2120 code?

Common causes of the P2120 fault code include:

• Faulty throttle position sensor
• Damaged wiring or connectors in the circuit
• Short circuit or open circuit in the throttle position sensor wiring
• Poor electrical connections or corrosion in the connectors
• Malfunctioning engine control unit (ECU)

How to fix P2120?

To resolve the P2120 fault code, the following steps should be taken:

• Use a scan tool to confirm the fault code and check for additional codes
• Inspect the throttle position sensor and its wiring for damage or corrosion
• Clean or repair any damaged connections and wiring
• Test the throttle position sensor using a multimeter to ensure it is functioning within specifications
• Replace the throttle position sensor if necessary
• Clear the fault codes and conduct a test drive to confirm the issue is resolved.