P227F means the passage between the air filter and the mass air flow sensor of bank 2 is restricted or lets air in that has bypassed the filter. By today's wording the code belongs to engines with a separate air path and MAF per bank; P2280 is the bank 1 version. FCA nevertheless sets P227F on Ram 2500 and 5500 heavy-duty trucks: STAR case S2218000013 (2022) reports it together with a prompt to service the air filter, sometimes alongside P0299 or P226C, on vehicles below 3,000 miles. The reason was factory filters whose paper media carried too much oil; a fresh filter is the first step. On the same trucks FCA treats the bank 1 sibling P2280 as a two-trip fault. A restricted filter starves the engine of air, so boost and power fall, and diesels may smoke more.
Medium severity. Can I keep driving?You can drive in moderation. If the engine goes into limp mode, go to a repair shop without passing other vehicles or demanding power.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- MIL on, on some trucks with an air filter service message
- Reduced power and boost under load
- More black smoke on diesel engines
Most likely causes
- Air filter clogged with dust or soaked with too much oil
- Intake opening blocked by snow, leaves or a collapsed duct
- Loose clamp or cracked duct between filter box and MAF on bank 2
- Faulty filter restriction or inlet pressure sensor
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: easy
- It affects emissions.
What each character of P227F means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 2: Fuel injection
- 7F: Specific fault in that system
Frequently asked questions
Can I keep driving with code P227F?
You can drive in moderation. If the engine goes into limp mode, go to a repair shop without passing other vehicles or demanding power.
What causes code P227F?
The most common causes are: air filter clogged with dust or soaked with too much oil; intake opening blocked by snow, leaves or a collapsed duct; loose clamp or cracked duct between filter box and MAF on bank 2.
Related codes
- P2280Air Flow Restriction/Air Leak Between Air Filter and MAF (Bank 1)
- P2281Air Leak Between MAF and Throttle Body
- P0299Turbocharger/Supercharger A Underboost Condition
- P226CTurbocharger Boost Control A Slow Response
- P0101Mass or Volume Air Flow Sensor A Circuit Range/Performance
Sources
- static.nhtsa.gov: MC 10230293 9999
- static.nhtsa.gov: MC 10140163 9999
- static.nhtsa.gov: MC 10216112 9999
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.