OBD-II Diagnostic Trouble Code
P2280 — Air Flow Restriction / Air Filter Restricted
P2280 indicates the ECM detected an intake air restriction between the air filter and the engine, usually from airflow or pressure readings showing more restriction than expected. A clogged air filter is the most common cause, but collapsed ducts or blockages also set it.
Severity 2/5
Truck-relevant
Service soon
Severity
Service soon
Air Flow Restriction / Air Filter Restricted
Code
P2280
Category
Powertrain
Subsystem
Air Flow
Truck-relevant
Yes
What this means for truckers
P2280 (Air Flow Restriction / Air Filter Restricted) — the ECM determined airflow is restricted. Check air filter first — if it's dirty, change it. Common at 50,000-100,000 mile intervals. On commercial trucks with dual filters or pre-cleaners, both elements matter.
Before you replace parts — try this first
P2280 on the Air Flow system is most often clogged or wet air filter — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Reduced power, especially on grades, black smoke under load, and higher exhaust temperatures. Fuel economy drops and the air filter restriction indicator may show red.
Common causes
- CommonClogged or wet air filter ($60–$250)
- OccasionalCollapsed intake duct or blocked air inlet (snow, debris, bird nests) ($50–$400)
- OccasionalFaulty intake restriction or airflow sensor ($100–$400)
- RareWrong or incorrectly installed filter ($60–$200)
How to fix
Inspect and replace the air filter
When to use: First step
Inspect the intake ducts, rain cap and pre-cleaner for blockage or collapse
When to use: When a new filter does not fix it
Verify restriction sensor reading with a manometer
When to use: When the intake is clear but the code returns
Affects most
- RAM 55001 complaint mention this code
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P229E — NOx Sensor Circuit Bank 1 Sensor 2
- → P229F — NOx Sensor Bank 1 Sensor 2
- → P22A4 — Reductant Heater B Control Circuit/Open
- → P22A5 — Reductant Heater B Control Circuit Low
- → P22A6 — Reductant Heater B Control Circuit High
- → Complaints on RAM 5500
Frequently Asked Questions
Can I drive with code P2280?
P2280 is severity 2 — service this week. Not an immediate stop, but ignoring it usually compounds the problem. Most common cause for this code is a worn sensor or minor performance fault that won't strand you today but will get more expensive the longer you wait.
How much does it cost to fix P2280 on a commercial truck?
Total repair cost ranges $50–$400 depending on the root cause. The cheapest fix is usually the first one listed below — Clogged or wet air filter — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P2280 fail a DOT inspection?
P2280 is generally not a direct DOT inspection fail item by itself. Inspectors focus on safety-critical systems (brakes, steering, tires, lights, hours-of-service). However, the check engine light alone can trigger additional inspection scrutiny. Best practice: fix the code and clear it before a planned inspection.
What's the difference between P2280 and related codes?
P2280 is closely related to: P229E (NOx Sensor Circuit Bank 1 Sensor 2), P229F (NOx Sensor Bank 1 Sensor 2), P22A4 (Reductant Heater B Control Circuit/Open), P22A5 (Reductant Heater B Control Circuit Low). These codes share the same subsystem (air-flow) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P2280 is set without the companions, the issue is more isolated.
How do I prevent P2280 from coming back after a repair?
For P2280 (Air Flow Restriction / Air Filter Restricted), prevention centers on the air flow system. Service air filter on time. Clean MAF sensor at every air filter change. Inspect intake boots/hoses for cracks — vibration kills them eventually.