P0171 on a 2016 Dodge Grand Caravan

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 2016 Dodge Grand Caravan

Ranked from 1,153 NHTSA owner complaints filed for this vehicle.

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1
Purge valve/solenoid failure or leak
Medium severity
One owner reports replacing the EVAP purge valve but continuing to have drivability issues, consistent with a stuck/leaking purge path still admitting unmetered air or vapor and pulling the mixture lean.
Reported in 1 NHTSA complaint
Parts:purge valve
2
Weak or failing fuel pump
Medium severity
One owner reports a fuel pump failure causing hesitation on this platform; reduced fuel delivery relative to incoming air is a standard lean-code cause.
Reported in 1 NHTSA complaint
Parts:fuel pump
3
Vacuum or intake air leak
Medium severity
A cracked hose or loose intake connection adds unmetered air the ECM doesn't account for, producing a lean fuel-trim code.
Common cause
4
Dirty or failing mass airflow (MAF) sensor
Medium severity
A contaminated or drifting MAF under-reports intake air, causing the ECM to under-fuel and trim lean.
Common cause
Parts:mass airflow sensor
5
PCV valve stuck open
Low severity
Excess unmetered crankcase air pulled through a stuck-open PCV valve skews the mixture lean, particularly at idle.
Common cause
Parts:PCV valve
6
Intake manifold gasket failure
Medium severity
A leaking manifold gasket admits unmetered air downstream of the MAF, a common lean-code cause as gaskets age.
Common cause
Parts:intake manifold gasket
7
Exhaust leak upstream of the oxygen sensor
Medium severity
A leak ahead of the sensor draws in outside air, making the ECM see a falsely lean exhaust reading.
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