P2004 on Nissan: How to Diagnose & Fix
Intake Manifold Runner Control Stuck Open (Bank 1)
1 Nissan model · 1 documented issue · $400-$1,200 repair
P2004 on Nissan by model: symptoms, diagnosis and fix
The 2.5L PR25DD four-cylinder used in 2019+ Altimas is direct-injection only, so fuel never washes the back of the intake valves. Over time carbon/soot accumulates on the intake valves and on the intake-manifold runner control flaps, causing rough idle, hesitation, reduced power, and reduced fuel economy. On 2019-2020 models in particular, cold weather can cause the intake-manifold runner control to stick and set DTC P2004 (Intake Manifold Runner Control Stuck Open, Bank 1); Nissan's TSB NTB20-083A directs replacement of the intake manifold to resolve the fault. As a GDI engine, the PR25DD generally benefits from periodic intake-valve cleaning (walnut blasting) at higher mileage.
Common Symptoms
- Check engine light (P2004)
- Rough idle
- Hesitation / loss of power
- Reduced fuel economy
- Cold-weather drivability issues
How to Fix
For a stored P2004, follow TSB NTB20-083A — typically replacement of the intake manifold assembly (the runner-control flaps/actuator are integral). For general carbon-related rough running, perform a walnut-blast intake-valve cleaning and consider an oil-catch can and use of Top Tier fuel to slow re-accumulation. EGR cleaning may also be needed if idle/stall symptoms persist.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- OEM Nissan Altima PR25DD upper intake manifold/plenum 14001-6CA0C family
2019-2020 Altima 2.5L PR25DD for this bulletin branch; select exact year and confirm VIN/current supersession.
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Sources for this issue (3)
P2004 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 P2004 mean on a Nissan?
P2004 stands for "Intake Manifold Runner Control Stuck Open (Bank 1)." P2004 means the intake manifold runner control for engine bank 1 is stuck in the open position. Many engines use flaps or valves inside the intake manifold that close at low RPM to boost air velocity and torque, then open at higher RPM; this code sets when the computer commands those runners to close but a sensor shows they remain open. The result is usually rough low-speed running, reduced low-end power, or hesitation. It indicates a mechanical or actuator problem in the variable intake system, not a true vacuum or fuel issue. On Nissan it is documented across 1 model: Altima.
What are the most common causes of P2004?
The most common causes of P2004 are: Stuck or seized intake manifold runner flaps (carbon buildup), Failed intake manifold runner control actuator or solenoid, Disconnected or broken actuator linkage/rod, Faulty intake runner position sensor, Damaged wiring or connector at the actuator/sensor, Vacuum leak or failed vacuum supply on vacuum-operated systems, Cracked or warped intake manifold. The specific cause varies by vehicle.
How much does it cost to fix P2004 on a Nissan?
Published repair estimates on Nissan range from $400 to $1,200 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 P2004 on a different make?
View P2004 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.