What Does P2021 Mean?
DTC P2021 indicates the intake manifold runner position sensor on bank 2 is reporting a signal voltage below the minimum threshold. This is the bank 2 counterpart to P2016. The ECM has detected an abnormally low voltage on the bank 2 IMRC position sensor signal circuit, preventing accurate determination of runner flap position.
Common Causes
30%
Short to ground in the bank 2 IMRC position sensor signal wire
30%
Internally failed bank 2 IMRC position sensor with low output
20%
Corroded connector pins creating a low-resistance leakage path at bank 2 sensor
15%
Damaged insulation on signal wire contacting grounded bracket or engine component
5%
ECM analog input fault on the bank 2 IMRC sensor channel
Diagnostic Steps
1
Measure voltage at the bank 2 IMRC position sensor signal pin with key on engine off; a very low reading confirms the fault.
2
Disconnect the bank 2 position sensor and check if signal voltage at the harness connector rises to near reference voltage.
3
Inspect the signal wire from the bank 2 sensor for chafing, pinching, or contact with grounded surfaces.
4
Check the sensor connector for moisture, corrosion, or contamination that could cause current leakage.
5
If the harness checks clean and voltage remains low with the sensor disconnected, investigate the ECM input circuit.
Estimated Repair Cost
$70 - $350
Parts + labor, varies by vehicle and location
DTC P2021 indicates the intake manifold runner position sensor on bank 2 is reporting a signal voltage below the minimum threshold. This is the bank 2 counterpart to P2016. The ECM has detected an abnormally low voltage on the bank 2 IMRC position sensor signal circuit, preventing accurate determina...
The most common cause of P2021 (Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2) is: Short to ground in the bank 2 IMRC position sensor signal wire
Typical repair costs for P2021 range from $70 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low safety risk. Bank 2 runner position feedback is lost but the vehicle remains safe to drive with minor performance impact.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2021 to identify the root cause.
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Quick Info
Category
Powertrain
System
Intake / Fuel Management
Difficulty
Type
Generic (SAE)
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