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Home / Codes / P2021
DTC code page

P2021: Intake Manifold Runner Position Sensor / Switch Circuit Low (Bank 2)

Quick answer: The PCM sees the Bank 2 intake runner position signal stuck lower than expected.

Drivers also search this fault as intake manifold runner position sensor circuit low bank 2, IMRC position sensor low bank 2, bank 2 runner position signal low.

Severity: medium Family: powertrain Related paths: 9
Meaning

What P2021 usually means

P2021 is the Bank 2 low-signal version of the intake runner position feedback family. The PCM is receiving a lower-than-expected signal from the Bank 2 runner sensor or switch, which can be caused by a short to ground, missing reference voltage, poor ground, sensor bias, or a runner that is physically near the low end of its travel. The goal is to decide whether Bank 2 really is parked low or whether the feedback circuit is making it look that way.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Check live Bank 2 runner feedback before replacing parts, because true low runner position and low circuit voltage can overlap on the scan tool.
  • Inspect the connector and harness near the Bank 2 side of the manifold for heat, oil, or chafing damage.
  • Compare Bank 2 commanded movement with visible linkage travel if the design allows it.
Driving risk

Can you keep driving?

P2021 is usually not an immediate stop-driving code, but the engine can feel weak or inconsistent until Bank 2 runner feedback is repaired.

Moderate urgency: This code often allows short-term driving, but the right fix usually comes faster when you diagnose it early instead of waiting for more codes.
Likely causes

Common causes behind this code

  • Bank 2 runner position sensor biased low
  • Signal wire shorted to ground or dragged low by corrosion
  • Missing or unstable reference voltage at the Bank 2 sensor
  • Poor ground at the sensor or actuator assembly
  • Runner linkage or flap stuck near the low end stop on Bank 2

Cause phrases often tied to this code: low runner feedback voltage, short to ground, missing 5 volt reference, bad IMRC sensor, bank 2 linkage issue.

Diagnostic order

Suggested workflow

  1. Capture freeze-frame and note the operating conditions when P2021 set.
  2. Verify Bank 2 reference voltage, ground quality, and signal continuity.
  3. Command runner movement and compare actual linkage motion with the reported feedback value.
  4. Inspect for deposits, stop wear, or drag that can hold Bank 2 near the low end of travel.
  5. After repair, confirm Bank 2 feedback rises and falls normally without returning low.
Avoid guesswork

Common mistakes

  • Replacing the manifold before proving the Bank 2 sensor still has a good reference and ground.
  • Assuming the runner must be stuck closed when the signal may simply be shorted low.
  • Ignoring intermittent pin-fit issues that only show up under vibration.
Repair path

Practical fix guidance

  • Repair the proven low-voltage circuit, reference, ground, or connector issue before replacing major hardware.
  • If Bank 2 is physically stuck low, correct the runner, linkage, or actuator problem found during testing.
  • Verify Bank 2 feedback remains believable through the full runner sweep after the repair.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P2021

Useful when the driver knows the wording but not the exact DTC yet.

  • intake manifold runner position sensor circuit low bank 2
  • IMRC position sensor low bank 2
  • bank 2 runner position signal low
Related search intent

Queries this page can answer naturally

  • P2021 code meaning
  • what does P2021 mean
  • intake manifold runner position sensor switch circuit low bank 2
FAQ

Quick questions about P2021

Is P2021 the Bank 2 version of P2016?

Yes. The logic is the same, but the diagnosis stays focused on the opposite bank of the engine.

Can missing 5-volt reference set P2021?

Yes. If the Bank 2 sensor loses its reference supply, the PCM may read the signal as abnormally low.

Why compare the healthy bank during diagnosis?

Because normal runner travel and feedback on the other bank provide a useful baseline when Bank 2 behavior is questionable.