P0174 on Dodge: How to Diagnose & Fix
System Too Lean (Bank 2)
12 Dodge models · 15 documented issues · 9 critical · $50-$8,500 repair
P0174 on Dodge by model: symptoms, diagnosis and fix
The 5.9L Magnum V8 intake manifold plenum gasket is a well-known failure point. The factory gasket degrades and allows engine oil to be drawn into the intake, causing oil consumption, misfires, and loss of power. The plenum pan sits atop the intake manifold and the gasket between them deteriorates over time. This is considered an inherent design flaw in all Magnum V8 engines (5.2L and 5.9L). Hughes Engines offers a permanent fix with a billet aluminum plenum plate that eliminates the gasket entirely.
Common Symptoms
- Excessive oil consumption
- Engine misfires and rough idle
- Oily residue visible through throttle body
- Loss of power under load
- Engine pinging or knocking
How to Fix
Confirm plenum gasket failure by removing the air hat and throttle body and checking for pooled oil or heavy oily residue in the intake, then verify with a vacuum test if needed. Repair requires removing the intake manifold, replacing the failed plenum pan gasket with an upgraded kit or, preferably, installing a Hughes Engines billet aluminum plenum plate and revised gasket set, along with new intake manifold belly pan bolts and threadlocker. While apart, inspect the manifold for warping and replace related intake gaskets, coolant, and vacuum lines as needed before torquing everything to spec in sequence. Typical repair cost is about $400-$900 in parts and labor at an independent shop, or roughly $150-$350 in parts for a DIY repair depending on whether the billet upgrade is used.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Billet plenum plate, Fel-Pro intake/plenum gaskets, bolts and bypass hose
Repair a confirmed Magnum V8 belly-pan/plenum leak Fitment: Hughes states all 1992-2003 Dodge/Jeep 5.2L and 5.9L Magnum V8 engines Live direct manufacturer product page when checked
Sources for this issue (1)
The 3.3L and 3.8L V6 engines suffer from water pump failures, thermostat sticking, and radiator fan relay failures. Overheating can cause head gasket failure. Fan relay is the most common single failure point. Same cooling system as Chrysler Town & Country.
Common Symptoms
- Engine overheating, especially at idle or in traffic
- Coolant leak from water pump area
- Temperature gauge fluctuating
- Heater blowing cold air
- Radiator fan not running at idle
How to Fix
Replace water pump (Gates 43090 for 3.8L), thermostat (Stant 45359, 195F), and radiator cap as a set. Check fan relay (5149541AA) and fan module (5017407AB). Use Mopar OAT coolant (68048953AB) only.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Gates 42292 engine water pump
Replace a leaking or noisy pump for the early issue subset Fitment: 2001-2007 Grand Caravan 3.3L/3.8L verified application Live direct US product page when checked
- Gates 41202 engine water pump
Later-generation water-pump replacement Fitment: 2008-2010 Grand Caravan 3.3L/3.8L Live direct US product page when checked
- Mopar five-year/100,000-mile HOAT coolant concentrate
Refill with the correct HOAT chemistry after cooling-system repair Fitment: MS-9769 HOAT for this 2001-2010 issue; never mix with later Chrysler OAT chemistry Live OEM direct product page when checked
- Mopar 4596198 radiator/recovery-tank cap
Replace a cap that fails pressure testing during later-generation service Fitment: Verified 2008-2010 Grand Caravan branch; earlier years require exact cap lookup $26.80 and Add to cart when checked
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Sources for this issue (1)
The 2.4L DOHC 4-cylinder engine (used across both Stratus generations) is prone to head gasket failure, particularly when overheating occurs. The aluminum cylinder head warps more easily than cast iron, and once warped, the head gasket cannot maintain a proper seal. Coolant mixing with oil or exhaust gases entering the cooling system are the primary failure modes. While more reliable than the 2.7L V6, the 2.4L still requires careful cooling system maintenance. The factory composite head gasket has been superseded by improved MLS (multi-layer steel) designs.
Common Symptoms
- White smoke from exhaust (coolant burning)
- Coolant loss with no visible external leak
- Engine overheating
- Milky residue on oil dipstick or filler cap
- Bubbling in coolant overflow reservoir
How to Fix
Confirm head gasket failure with a cooling-system pressure test, combustion-gas/block test, and compression or leak-down test, then inspect for coolant in the oil and check the cylinder head and block deck for warpage after disassembly. Repair requires removing the cylinder head, machining or replacing the head if out of spec, and installing an updated MLS head gasket with new torque-to-yield head bolts; the timing belt, water pump, thermostat, and radiator cap should also be inspected or replaced if overdue to prevent repeat overheating. Flush contaminated oil and coolant, refill with the correct fluids, and verify radiator fan operation and overall cooling-system condition before returning the car to service. Typical repair cost is about $1,200-$2,500 depending on machine-shop work, related cooling-system parts, and whether the head must be replaced.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Fel-Pro HS9924PT-1 cylinder-head gasket set
Early 2.4L head-gasket repair after testing and machine-shop inspection Fitment: Live page verifies 2001 2.4L and catalog evidence covers early applications; select exact year/valve-cover/body configuration rather than extrapolating to 2…
- Fel-Pro HS26202PT-1 cylinder-head gasket set
Later 2.4L head-gasket repair where the nine-bolt valve-cover configuration matches Fitment: 2004-2006 2.4L with specified valve-cover configuration; not the full 1995-2006 range Live direct US product page with price and availability wh…
- Fel-Pro ES71028 torque-to-yield head bolts with washers
Required new fasteners for the head-gasket repair Fitment: Live fitment lists 1995-2006 Stratus 2.4L; use the exact service-manual torque-angle procedure Live in-stock direct US product page when checked
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Sources for this issue (1)
The 2.4L Tigershark MultiAir II engine has defective piston rings allowing oil into combustion chamber. Owners report 1 quart per 1,000-2,000 miles. FCA considered up to 1 quart per 2,000 miles 'acceptable.' Class-action settlement reached (Wood, et al. v. FCA US, LLC). CSN W80 warranty extension: 7 years/100,000 miles.
Common Symptoms
- Oil consumption of 1+ quart per 1,000-2,000 miles
- Low oil pressure warning light
- Blue smoke from exhaust
- Engine stalling or seizing without warning
- Rough idle or misfires
How to Fix
Contact FCA dealer for oil consumption test under CSN W80. PCM flash changes MultiAir operation to reduce vacuum during deceleration. Engine long block replacement for severe cases. File claim at fcatigersharksettlement.com.
Sources for this issue (1)
Debris accumulates in cylinder head coolant port at primary thermostat housing, blocking coolant flow and causing overheating. Typically occurs around 78,000 miles. Can cause head gasket failure or engine damage if not addressed.
Common Symptoms
- Engine temperature light or gauge showing overheating
- Overheating in traffic or at idle
- Heater blowing lukewarm or cold air
- Coolant appears dirty or contaminated
- Steam from under hood
How to Fix
Flush cooling system thoroughly to remove debris from thermostat housing port. Replace thermostat and housing gasket. In severe cases, thermostat housing replacement needed. Use only Mopar OAT coolant. Change coolant every 50,000 miles.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 5184570AK thermostat housing
Replace a diagnosed thermostat/housing failure on the verified 3.6L subset Fitment: 2011-2019 Journey 3.6L; not 2.4L or 3.5L Live Mopar direct-product page when checked
- Mopar HOAT coolant
Correct coolant family for early Journey applications that specify HOAT Fitment: Confirm owner manual/build date; the 2009 manual specifies HOAT Live OEM direct-product page when checked
- Mopar OAT coolant
Correct coolant family for later Journey applications that specify OAT Fitment: Confirm owner manual/build date; never mix with HOAT Live Mopar direct-product page when checked
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
2014 models with 2.4L engine notorious for head gasket failures around 100,000 miles. Fails due to overheating issues and possible manufacturing defects in gasket material or cylinder head warping. Plastic thermostat housing contributes to overheating.
Common Symptoms
- White smoke from exhaust (coolant burning)
- Milky or foamy oil (coolant mixing)
- External coolant leaks
- Engine overheating repeatedly
- Loss of coolant with no visible leak
How to Fix
Replace head gasket which requires cylinder head removal. Have head inspected for warping and resurfaced if necessary. Replace thermostat and housing simultaneously. Check for additional engine damage from overheating.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 68676479AA thermostat housing
Replace only if warped, leaking or damaged during the overheating repair Fitment: Use Mopar VIN fitment for the 2.4L configuration Live Mopar direct-product page when checked
Sources for this issue (1)
P0174 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0174 mean on a Dodge?
P0174 stands for "System Too Lean (Bank 2)." P0174 means the engine computer detected that the air-fuel mixture on Bank 2 (the side of the engine with cylinder 2) is running too lean — too much air relative to fuel. The computer monitors this through the oxygen/air-fuel sensors and fuel trims; when it has to add a large amount of extra fuel to compensate and still can't reach the target, it flags the mixture as too lean. A lean condition can cause rough idle, hesitation, or misfires, and over time can raise combustion temperatures. Because it's Bank 2 specific, an unmetered air leak on that bank or a fuel delivery shortfall is typical. On Dodge it is documented across 12 models: Ram 1500, Grand Caravan, Stratus, Dart, Journey, Durango, Dakota, Shadow, Avenger, Ram Van, Spirit, Viper.
What are the most common causes of P0174?
The most common causes of P0174 are: Vacuum or intake air leak (hoses, gaskets, PCV), Dirty or failing mass airflow (MAF) sensor, Weak fuel pump or restricted fuel filter (low fuel pressure), Clogged or underperforming fuel injectors, Leaking intake manifold or throttle body gasket, Faulty or contaminated oxygen / air-fuel sensor, Exhaust leak upstream of the oxygen sensor, Stuck-open EGR valve. The specific cause varies by vehicle.
How much does it cost to fix P0174 on a Dodge?
Published repair estimates on Dodge range from $50 to $8,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0174 on a different make?
View P0174 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.