P2021 OBD-II Trouble Code: Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2021 code

P2021 is a diagnostic trouble code (DTC) for "Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2021 DIAGNOSTIC Get a fair and transparent estimate upfront

P2021 trouble code definition

Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2

It should be noted that this code can have a different description if the vehicle has a diesel engine. If that is the case, the definition would be “Rail Pressure Monitoring VIA Pressure Control Valve, pressure low”. Not as common as the gas code definition, but still in use on some vehicles.

What the P2021 code means

Circuit Low Bank 2 is stating the circuit has lower value than the PCM (powertrain control module) expects. The resistance or voltage in the sensor changes as the valve position changes.

There is typically an actuator or solenoid that redirects the path of air traveling through the intake manifold to the cylinders. The changing intake runner length is used to optimize air flow through the intake manifold as RPM (revolutions per minute) change.

What causes the P2021 code?

This code is set when the PCM sensor monitoring the intake runner valve position is not in the expected position. Most often the computer is watching a changing resistance or voltage value that increases or decreases depending on the valves position.

What are the symptoms of the P2021 code?

Usually there is a drivability concern noticed by the owner. The vehicle can exhibit a variety of symptoms depending on the type of system being used:

  • Erratic idle
  • Lack of power
  • Engine won’t rev as high as usual
  • Engine stall
  • Check Engine Light
  • Vacuum leak

How does a mechanic diagnose the P2021 code?

  • The technician will first connect a scanner to the vehicle to either command the system on or simply to monitor the system data.

  • Often times a handheld vacuum pump will be used to test one or more vacuum operated actuators. If the system is actuated electrically then the components will often be referred to as a solenoid or motor.

  • Regardless of the technology, the technician is monitoring the intake to see if the internal valve is being turned by the solenoid, actuator or motor. This can be accomplished by commanding the system on with the scanner or driving the vehicle under the conditions necessary to activate the system and watch the scan tool data.

  • Many times it is necessary to disassemble the intake to see if the intake runner valve is stuck.

Common mistakes when diagnosing the P2021 code

These systems are fairly simple in their design and function, although the rationale for their use is often misunderstood. For this reason a mechanic will often miss other problems with the motor that will affect the operation of this system.

How serious is the P2021 code?

Other than the inconvenience of erratic drivability symptoms, problems with this system will not likely cause any permanent damage to the motor. Although the symptoms will likely be noticeable enough to force the owner to seek a repair shop sooner than later. Driving a vehicle with this system impaired will most likely be frustrating.

What repairs can fix the P2021 code?

Usually it is a broken diaphragm inside a vacuum controlled actuator that needs to be replaced. However, other possibilities are:

  • Replace electric valve solenoid
  • Replace valve position sensor
  • Replace the vacuum valve actuator
  • Repair poor connections at electrical connections
  • Repair any vacuum leaks
  • Replace broken vacuum hoses
  • Repair other components that can affect the intake manifold pressures

Additional comments for consideration regarding the P202 code

Each manufacturer utilizes different strategies when designing a VIM system (variable intake manifold). For this reason terminology will differ between manufacturers. This particular code is for bank 2. This indicates there are likely two sensors for this engine. Bank 2 would be the sensor on the intake runner that supplies air to the bank of cylinders not including number one cylinder.

This code specifically monitors the variable intake manifold valve position sensor. The sensor is used by the PCM to know what position the VIM valve is in. If this valve is not in the position the PCM is expecting for the present engine conditions, code P2021 will be set. It should be noted, if the motor has only one bank of cylinders, this code will not be utilized for that particular vehicle.

Need help with a P2021 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P2021

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2021 code.

SCHEDULE P2021 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,295)

Rating Summary
5,825
224
52
35
159
5,825
224
52
35
159

JOHNNY

33 years of experience
96 reviews
JOHNNY
33 years of experience
BMW 325Ci - Check Engine Light is on - Sacramento, California
He was great explained everything to me and have now booked him for another appointment. Thanks johnny.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Mercedes-Benz C300 - Check Engine Light is on - Spring, Texas
Mister Ron was very nice and took time out to explain any concerns I might have about my car. He also made sure he communicated with me when he was on his way, once he was outside, and when we was done working on my car. I appreciate that considering I have a newborn that I had to look after.

Ronald

41 years of experience
93 reviews
Ronald
41 years of experience
Ram 1500 - Check Engine Light is on - Spring, Texas
Extremely satisfied with the service, he was able to come out and diagnose almost immediately. We purchased the parts, he came back installed them and been running great since. Would definitely recommend him and will not hesitate to call again if needed.

Scott

36 years of experience
802 reviews
Scott
36 years of experience
Dodge Neon - Check Engine Light is on - Tempe, Arizona
I truly enjoy Scott as he has done work for me in the past. Scott is very friendly, knowledgeable, and a true professional! I highly recommend him.


Related questions

Check Engine Light Won't Come Off.

Hello, and thank you for writing in. There may be several other issues going on with the vehicle. The first to check is the TGV (tumble generator valve) sensor. It may need to be replaced, or the valve may need...

More related articles

P2635 OBD-II Trouble Code: Fuel Pump ‘A’ Low Flow / Performance
P2635 P2635 Code Definition A P2635 code is a generic powertrain code related to computer output circuit issues. It means that the fuel pump 'A’ is registering a low flow, or one not within the preset parameters. Codes related to...
P2068 OBD-II Trouble Code: Fuel Level Sensor “B” Circuit High
P2068 P2068 trouble code definition Fuel Level Sensor “B” Circuit High What the P2068 code means This code indicates the fuel level sensor is indicating a higher than expected voltage. The higher the value the more fuel is in the...
P0749 OBD-II Trouble Code:Transmission Fluid Pressure Solenoid Intermittent
P0749 means a voltage problem with the transmission fluid pressure control solenoid due to a faulty solenoid,or dirty or low transmission fluid

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com