P20F9 code meaning
Intake Manifold Runner Control Circuit Performance (Bank 2)
Powertrain system Generic code P20xx codes Check engine light
What P20F9 means
P20F9 is the bank 2 counterpart of P20F8: the runner or swirl flaps of the second cylinder bank do not track their commanded position. It needs a V engine whose banks have separately driven flaps, each with its own position feedback. No manufacturer documents this code publicly; GM and Mazda only use the bank 1 code P20F8. GM's diesel logic for P20F8 shows how such a test works: set point and measured position are compared continuously, and a deviation above 10 % in most samples counts as a fault with warm coolant and a supply above 11 V. CARB's comprehensive component rules require functional checks of such actuators where they affect emissions. Directional faults on bank 2 are P2005 (stuck open) and P2007 (stuck closed); electrical faults are P2011–P2013. Expect the MIL and possibly uneven running between banks.
P20F9 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P20F9
- Malfunction indicator lamp on
- Uneven idle or reduced torque at low speed
Common causes of P20F9
- Most likelyBank 2 flaps sticking from deposits
- PossibleBank 2 actuator or position sensor faulty
- Less likelyBroken or detached linkage between actuator and flap shaft
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Imrc actuatorWiring harness
What each part of P20F9 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. |
| F9 | The exact fault in that area. |
What to do next
- Note P20F9 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 P20F9
What does P20F9 mean?
P20F9 means "Intake Manifold Runner Control Circuit Performance (Bank 2)". P20F9 is the bank 2 counterpart of P20F8: the runner or swirl flaps of the second cylinder bank do not track their commanded position. It is a generic code, so it means the same on every make.
Is it safe to drive with P20F9?
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 P20F9 fail an emissions test?
Yes, it can. P20F9 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 P20F9 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P20F9 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.