The P2021: Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 refers to an issue where the voltage in the intake manifold runner position sensor or switch circuit for Bank 2 is lower than expected. This could be caused by a faulty sensor or switch, low voltage in the circuit, or wiring and connector problems.
P2021 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P2021: Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 |
| Is it serious? | Yes, this can cause improper air intake, affecting engine performance and fuel efficiency. |
| Possible causes | – Low voltage in the position sensor or switch circuit – Faulty sensor or switch – Wiring or connector issues |
| How to diagnose? | – Measure voltage in the sensor or switch circuit – Test the sensor or switch – Inspect wiring and connectors |
P2021 Meaning
The P2021: Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 code indicates that the voltage in the intake manifold runner position sensor or switch circuit on Bank 2 is below the manufacturer’s specified range. The intake manifold runner system controls airflow into the engine by adjusting the position of the runners. Low voltage can prevent the sensor from sending proper signals, resulting in poor engine performance.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the intake manifold runner system or other engine control issues. These codes may provide further context. | OBD-II Scanner |
| Measure Voltage in the Sensor/Switch Circuit | Use a multimeter to measure the voltage in the intake manifold runner position sensor or switch circuit on Bank 2. Compare the voltage readings to manufacturer specifications to verify if it is too low. | Multimeter |
| Test the Position Sensor or Switch | Use a diagnostic tool to test the intake manifold runner position sensor or switch for proper operation. Ensure that the sensor is providing the correct signals based on the position of the intake runners. | Diagnostic Tool, Multimeter |
| Inspect Wiring and Connectors | Visually inspect the wiring and connectors related to the intake manifold runner position sensor or switch. Look for signs of damage, corrosion, or loose connections that could be causing low voltage. | Flashlight, Multimeter |
| Test Circuit Continuity | Perform a continuity test on the wiring circuit to check for any shorts, open circuits, or high resistance that could be affecting the sensor’s voltage. | Multimeter |
| Check the Intake Manifold Runner System | Inspect the intake manifold runners for any blockages, damage, or wear that may be causing the sensor or switch to malfunction. Ensure the runners can open and close properly. | Flashlight, Intake Cleaner |
| Repair or Replace Damaged Components | Repair or replace any faulty wiring, connectors, or sensors to restore proper voltage and functionality of the intake manifold runner system. | Wiring Repair Kit, Multimeter |
| Clear the Code and Test Drive | After completing repairs, clear the P2021 code using an OBD-II scanner. Take the vehicle for a test drive to ensure that the issue has been resolved and engine performance has improved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to verify that the P2021 code has not returned. | OBD-II Scanner |
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