P0171 on a 2022 Ram 1500 Crew Cab Trx

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 Trx

Ranked from 588 NHTSA owner complaints filed for this vehicle.

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1
Weak or failing fuel pump
High severity
A dealer found a faulty fuel pump on this exact truck after it shut off in a turn lane with no warning light — insufficient pump output starves the engine of fuel and leans out bank 1.
Reported in 1 NHTSA complaint
Parts:fuel pump
2
Clogged or failing fuel injector
Medium severity
A dealer diagnosed a failed fuel injector on this exact model after sudden inoperability, which reduces fuel delivery and can push the system lean.
Reported in 1 NHTSA complaint
Parts:fuel injector
3
Vacuum or intake air leak
High severity
Unmetered air entering after the MAF sensor is the single most common P0171 cause; check intake boots, PCV lines, and brake booster hose.
Common cause
4
Dirty or failing MAF sensor
Medium severity
An underreporting MAF sensor tells the PCM less air is entering than actually is, so it under-fuels and trims lean.
Common cause
Parts:MAF sensor
5
Clogged fuel filter
Medium severity
Restricted filter flow reduces rail pressure under load, mimicking a lean condition on acceleration.
Common cause
Parts:fuel filter
6
Stuck-open PCV valve
Medium severity
A PCV valve stuck open pulls excess unmetered air into the intake, especially noticeable at idle.
Common cause
Parts:PCV valve
7
Exhaust leak upstream of the front O2/air-fuel sensor
Low severity
Exhaust leaks before the sensor draw in outside air and make the system falsely read lean.
Common cause
8
Intake manifold gasket leak
Medium severity
A failed manifold gasket is a common vacuum leak point on V8s and produces a persistent lean code.
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