P2621 Fault Code

Throttle Position Output Circuit Low

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

The P2621 fault code indicates a problem with the throttle position output circuit, which is responsible for sending the throttle position signal to the engine control module (ECM). When this circuit is low, it means that the signal being sent is lower than expected, which can affect engine performance and response.

What are the symptoms of the P2621 code?

Common symptoms associated with the P2621 fault code include:

• Check Engine Light illuminated on the dashboard
• Poor acceleration or sluggish engine response
• Unstable or erratic engine idle
• Engine stalling or hesitation during acceleration

What causes the P2621 code?

Several factors can lead to the P2621 code being triggered, including:

• Faulty throttle position sensor (TPS)
• Damaged wiring or connectors in the throttle position circuit
• A malfunctioning engine control module (ECM)
• Poor electrical connections due to corrosion or wear

How to fix P2621?

To resolve the P2621 fault code, the following steps can be taken:

• Inspect the throttle position sensor and its connections for damage or corrosion.
• Check the wiring harness for any signs of wear, fraying, or disconnection.
• Use a multimeter to test the TPS output voltage and compare it with the manufacturer specifications.
• If the TPS is defective, replace it and clear the code.
• If all components are functioning properly, consider checking the ECM for possible faults.