The P2021 trouble code relates to a low voltage condition detected in the intake manifold runner position sensor or switch circuit in bank 2.
P2021 Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2
Code symptoms P2021.
1. Rough idling.
2. Decreased engine performance, especially at low RPMs.
3. Poor fuel efficiency.
4. The Check Engine Light (CEL) may be illuminated.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2021.
1. Faulty intake manifold runner position sensor or switch.
2. Damaged wiring or connectors in the intake manifold runner position sensor or switch circuit.
3. Low voltage in the intake manifold runner position sensor or switch circuit.
Code Solutions P2021.
1. Test and replace the intake manifold runner position sensor or switch if it is faulty.
2. Inspect the wiring and connectors in the intake manifold runner position sensor or switch circuit for any damage or corrosion. Repair or replace any damaged wiring or connectors.
3. Check for low voltage in the intake manifold runner position sensor or switch circuit and adjust or repair as necessary.