P2021 Fault Code

Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2a

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

The P2021 fault code indicates an issue with the Intake Manifold Runner Position Sensor or switch circuit for Bank 2. This sensor is crucial for optimizing engine performance by controlling the intake air, leading to better fuel efficiency and reduced emissions. A low circuit reading in Bank 2 suggests that the vehicle is experiencing problems with the sensor's performance or the circuit itself.

What are the symptoms of the P2021 code?

Vehicles with a P2021 code may display various symptoms, such as:

• Rough idling or poor engine performance.
• Reduced fuel economy due to improper air-fuel mixture.
• Illumination of the check engine light.
• Possible engine stalling when the runner position sensor cannot adjust correctly.

What causes the P2021 code?

Several factors may lead to the P2021 code being triggered, including:

• A faulty intake manifold runner position sensor.
• Damaged or frayed wiring in the circuit.
• Corrosion or poor connections in the electrical system.
• Intake manifold runner stuck in a fixed position due to debris or mechanical failure.

How to fix P2021?

To resolve the P2021 code, the following steps should be taken:

• Use a scanner to confirm the fault and check if there are any related codes.
• Inspect the intake manifold runner position sensor for damage or corrosion.
• Examine the wiring and connectors for breaks or poor contacts.
• If the sensor is found to be faulty, replace it and clear the fault code.
• For mechanical issues, ensure the intake manifold runner is free of blockages and operating properly.