P0171 on a 2022 Ram 1500 Crew 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 Crew Cab

Ranked from 588 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Weak or failing fuel pump
High severity
Dealer found a faulty fuel pump after the truck shut off mid-drive; insufficient fuel delivery is a direct lean-condition cause.
Reported in 1 NHTSA complaint
Parts:fuel pump
2
Fuel injector fault reducing cylinder fueling
Medium severity
Dealer diagnosed fuel injector failure after a check-engine light and engine failure; an underperforming injector can register as a lean condition.
Reported in 1 NHTSA complaint
Parts:fuel injector
3
Vacuum or intake leak
Medium severity
Unmetered air entering after the MAF causes the ECM to read lean.
Common cause
4
Dirty or failing MAF sensor
Medium severity
An underreporting MAF causes the ECM to under-fuel.
Common cause
Parts:mass airflow sensor
5
Clogged fuel filter
Medium severity
Restricted fuel flow under load produces a lean condition.
Common cause
Parts:fuel filter
6
Stuck-open PCV valve
Low severity
An open PCV path adds unmetered air to the intake.
Common cause
Parts:PCV valve
7
Exhaust leak upstream of the O2 sensor
Low severity
Extra air reaching the sensor ahead of the catalyst makes the system read falsely lean.
Common cause
8
Intake manifold gasket failure
Medium severity
A leaking manifold gasket is a common unmetered-air path.
Common cause
Parts:intake manifold gasket

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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