P0171 on a 2022 Chevrolet Silverado 1500 Ltd

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 Chevrolet Silverado 1500 Ltd

Ranked from 577 NHTSA owner complaints filed for this vehicle.

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1
Fuel Pump Control Module (FPCM) failure
High severity
DTC P129F for a failed fuel pump control/driver module was independently diagnosed on multiple trucks in this batch; a weakening FPCM drops fuel pressure enough to lean out the mixture before it fails completely.
Reported in 3 NHTSA complaints
Parts:fuel pump control module fuel pump
2
Failing fuel injector(s)
Medium severity
Two owners had fuel injectors diagnosed as faulty (one with two injectors replaced over time), producing shudder and reduced-power warnings consistent with a cylinder running lean from inadequate injector delivery.
Reported in 2 NHTSA complaints
Parts:fuel injector
3
High-pressure fuel line/pump failure
High severity
An owner had a fuel leak from a hot high-pressure fuel-system component confirmed by the dealer, dripping onto the exhaust; a leaking or weak high-pressure supply reduces delivered fuel pressure and leans the mixture.
Reported in 1 NHTSA complaint
Parts:high pressure fuel pump
4
Vacuum or intake air leak
Medium severity
Unmetered air entering after the MAF sensor (cracked intake boot, loose PCV hose, etc.) is the single most common cause of a P0171 on any port/direct-injected engine.
Common cause
5
Dirty or failing MAF sensor
Low severity
A contaminated or drifting MAF under-reports incoming air, causing the ECM to under-fuel and trip a lean code.
Common cause
Parts:mass airflow sensor
6
Clogged fuel filter restricting supply
Low severity
A restricted filter reduces fuel delivery at higher demand, producing the same lean-trim symptoms as a weak pump.
Common cause
Parts:fuel filter
7
Exhaust leak upstream of the front O2 sensor
Low severity
A leak ahead of the sensor draws in outside air and makes the ECM read (and correct for) a falsely lean exhaust sample.
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