AutoCodes – Subaru – P2021 Subaru

P2021 Subaru Code - Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2

Quick Answer

The Intake Manifold Runner Control (IMRC) system is monitored for failure during continuous or Key On Engine Off (KOEO) self-test. Common causes include Faulty Intake Manifold Runner Position Sensor/Switch, Intake Manifold Runner Position Sensor/Switch harness is open or shorted, Intake Manifold Runner Position Sensor/Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2021 Subaru indicates Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2.
Common causes: Common causes include Faulty Intake Manifold Runner Position Sensor/Switch, Intake Manifold Runner Position Sensor/Switch harness is open or shorted, Intake Manifold Runner Position Sensor/Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 29,687

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 18, 2019

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P2021 Subaru Description

The Intake Manifold Runner Control (IMRC) system is monitored for failure during continuous or Key On Engine Off (KOEO) self-test. Each code distinguishes the corresponding bank for IMRC actuator assemblies with dual monitor switches. The test fails when the system detects the presence of a broken or persistently out of range linkage. The code sets when the Powertrain Control Module (PCM) has detected a mechanical fault in the Intake Manifold Runner Control (IMRC) system.

OBDII Code P2021 Subaru - Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 - AutoCodes.com — P2021 Subaru Code - Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2

What does this mean?

What are the Possible Causes of the DTC P2021 Subaru?

Faulty Intake Manifold Runner Position Sensor/Switch
Intake Manifold Runner Position Sensor/Switch harness is open or shorted
Intake Manifold Runner Position Sensor/Switch circuit poor electrical connection
Mechanical concern
bind, seize, damage, or obstruction of IMRC hardware

How to Fix the DTC P2021 Subaru?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2021 Subaru code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2021 Subaru Code

1. What is an OBDII code P2021 in a Subaru?

The P2021 code indicates a problem with the Intake Manifold Runner Position Sensor/Switch Circuit Low for bank 2. This means that the voltage received by the engine control module (ECM) from the sensor is below the expected range.

2. What symptoms might I notice if my Subaru displays a P2021 code?

Symptoms can include a check engine light, reduced engine performance, poor fuel economy, and in some cases, the engine may experience difficulty in starting or an erratic idle.

3. What causes a P2021 code to be triggered in a Subaru?

Common causes include faulty wiring or connections to the intake manifold runner position sensor, a bad sensor itself, or issues with the intake manifold runner actuator.

4. How can I fix the P2021 code on my Subaru?

Repairing this code may involve inspecting and repairing or replacing damaged wiring, replacing the faulty intake manifold runner position sensor, or fixing the intake manifold runner actuator if it's malfunctioning.

5. Is it safe to drive my Subaru with a P2021 code?

While you might be able to drive with this code, it's advisable to address the issue promptly as it can affect the vehicle's performance and fuel efficiency. Extended driving with this fault could lead to further damage.

6. How do I prevent the P2021 code from happening in my Subaru?

Regular maintenance and timely repairs of the intake manifold system and associated components can help prevent issues related to the P2021 code. Ensure that wiring and connectors are checked regularly for signs of wear and damage.

7. Can I diagnose the P2021 code on my Subaru by myself?

If you have experience with car maintenance and access to a diagnostic scanner, you might be able to perform some basic diagnostics. However, for accurate diagnosis and repair, it's recommended to consult a professional mechanic.

8. What tools are needed to diagnose the P2021 code in a Subaru?

Typically, a diagnostic OBD2 scanner is required to read the code and monitor the sensor's voltage. Additionally, a multimeter can be useful for checking the integrity of wires and connections.