P0171 on a 2022 Ram 1500 Classic Regular Cab

P0171 means the engine computer is adding more fuel than normal on bank 1 because it sees too much air or not enough fuel.

Not your vehicle? See general P0171 info.

Most common causes on the 2022 Ram 1500 Classic Regular Cab

Ranked from 588 NHTSA owner complaints filed for this vehicle.

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1
Weak or failing fuel pump
High severity
One truck stalled with the dealer confirming a faulty fuel pump, and another reported the fuel system simply stopped delivering fuel — both consistent with a pump too weak to maintain rail pressure, which the PCM reads as lean.
Reported in 2 NHTSA complaints
Parts:fuel pump
2
Fuel injector fault reducing fuel delivery
Medium severity
One owner's vehicle failed and was diagnosed by the dealer with a fuel injector failure, a direct fuel-delivery shortfall that can register as a lean condition.
Reported in 1 NHTSA complaint
Parts:fuel injector
3
Vacuum or intake air leak
Medium severity
Air entering after the MAF sensor is not accounted for in the fuel calculation, causing a lean trim.
Common cause
4
Dirty or failing mass airflow (MAF) sensor
Medium severity
An inaccurate MAF signal under-reports incoming air, causing the PCM to under-fuel and trip a lean code.
Common cause
Parts:mass airflow sensor
5
Clogged fuel filter
Low severity
Restricted fuel flow to the rail reduces available fuel pressure/volume under load, producing a lean condition.
Common cause
Parts:fuel filter
6
Stuck-open PCV valve
Low severity
Excess crankcase air pulled into the intake skews the air/fuel ratio lean.
Common cause
Parts:PCV valve
7
Intake manifold gasket leak
Medium severity
A leaking gasket admits unmetered air downstream of the MAF sensor.
Common cause
Parts:intake manifold gasket
8
Exhaust leak upstream of the air-fuel sensor
Low severity
Outside air drawn in ahead of the sensor makes the mixture appear leaner than it is.
Common cause

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0171 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Rough idle
Hesitation
Surging idle
Poor fuel economy

What to check before replacing parts

Review short- and long-term fuel trims on bank 1

Look for: High positive trims (commonly worse at idle, improving with RPM) mean the computer is adding fuel to compensate for excess air or insufficient fuel — that pattern is this code's fingerprint.

Smoke-test the intake

Look for: Smoke escaping (or a hiss you can hear) at intake boots, gaskets, or vacuum hose connections confirms unmetered air is entering after the MAF sensor, which is the most common cause of a lean code.

Inspect the PCV hoses and valve

Look for: A cracked, split, or disconnected PCV hose, or a PCV valve stuck open, draws in extra unmetered air the same way a vacuum leak does.

Clean and test the MAF sensor

Look for: Visible dirt or oil film on the sensor element, or a grams/second reading that doesn't track expected airflow for RPM, means the MAF is under-reporting air and causing the computer to under-fuel.

Verify fuel pressure

Look for: Pressure below spec (weak pump, clogged filter, failing regulator) starves the engine of fuel and produces the same lean trim pattern as a vacuum leak — rule it out before chasing leaks.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Car Runs Rough