P2021 code meaning
Intake Manifold Runner Position Sensor/Switch Circuit Low (Bank 2)
Powertrain system Generic code P20xx codes Check engine light
What P2021 means
P2021 is the low-signal code for the bank 2 runner position sensor. Ford documents it for vacuum-operated runner control on its V engines in the 2020–2023 summary: the position input below 0.24 V for 5 s, monitored continuously once coolant exceeds 40 °F. In the 2024 edition the same fault is shown as P2019 with failure byte 11. A low reading means the signal line is pulled to ground, the 5 V supply to the sensor is missing, or the sensor itself has failed short. On engines that share one reference for both banks, a simultaneous P2016 points to that common circuit. The ECM stops trusting the feedback and usually leaves the flaps in their default position.
P2021 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2021
- Check engine lamp on
- Slight loss of low-end torque
Common causes of P2021
- Most likelyBank 2 signal wire grounded
- Possible5 V reference to the bank 2 sensor open
- PossibleBank 2 position sensor internally shorted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Imrc position sensor b2Imrc wiring
What each part of P2021 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 21 | The exact fault in that area. |
What to do next
- Note P2021 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2021
What does P2021 mean?
P2021 means "Intake Manifold Runner Position Sensor/Switch Circuit Low (Bank 2)". P2021 is the low-signal code for the bank 2 runner position sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with P2021?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P2021 fail an emissions test?
Yes, it can. P2021 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2021 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2021 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.