P0401 on RAM
Exhaust Gas Recirculation Flow Insufficient
P0401 on RAM vehicles indicates exhaust gas recirculation flow insufficient. Au7o has documented this code across 2 RAM models — most commonly on 1500, ProMaster. This code means the Exhaust Gas Recirculation (EGR) system is not flowing enough exhaust back into the engine. The EGR system recirculates a small amount of exhaust into the intake to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions; the computer has determined the actual flow is below what it commanded. The most common reason is carbon buildup clogging the EGR valve or its passages. You may notice pinging/knocking, rough idle, or a check engine light, and the car will fail emissions testing. Typical repair costs on RAM range from $40 to $2,500, depending on the specific model and root cause.
Common Causes of P0401
- •Carbon buildup clogging the EGR valve or passages
- •Stuck or faulty EGR valve
- •Blocked or restricted EGR ports/tubes
- •Faulty EGR temperature or position sensor
- •Faulty DPFE/EGR pressure sensor (on applicable systems)
- •Vacuum leak or failed vacuum control (vacuum-operated EGR)
- •Wiring or connector problems at the EGR valve
P0401 on RAM by Model
RAM 1500(1 issue)
- Dashboard Cracking and Warping2019-2024
The 2019-2024 RAM 1500 dashboard develops cracks, warping, and deformation, particularly in hot climates. Cracks commonly appear near the defroster vents, along the passenger side airbag seam, and around the center console area. The issue is attributed to UV exposure and thermal cycling degrading the dashboard material. Vehicles parked outdoors in southern states (AZ, TX, NV, FL) are most affected. While primarily cosmetic, cracks near the passenger airbag seam could theoretically affect airbag deployment. Dashboard replacement costs $1,500-2,500+ at the dealer.
RAM ProMaster(1 issue)
- 3.6L Pentastar V6 Oil Filter Housing/Cooler Leak2014-2025
The RAM ProMaster with the 3.6L Pentastar V6 engine suffers from a well-known oil filter housing/cooler leak. The oil filter housing is mounted to the side of the engine block and contains an integrated oil cooler. The gaskets and O-rings that seal the housing deteriorate over time, causing oil to leak externally (visible drip on the ground) and/or internally (oil mixing with coolant). If oil enters the cooling system, it destroys the coolant and can cause overheating. The leak typically appears between 40,000-80,000 miles. This is the same issue that affects all Pentastar 3.6L vehicles (Jeep, Dodge, Chrysler). Mopar updated the housing design (68105583AF) with improved seals.
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View P0401 across all makes →Frequently Asked Questions
What does P0401 mean on RAM?▼
P0401 stands for "Exhaust Gas Recirculation Flow Insufficient." This code means the Exhaust Gas Recirculation (EGR) system is not flowing enough exhaust back into the engine. The EGR system recirculates a small amount of exhaust into the intake to lower combustion temperatures and reduce nitrogen oxide (NOx) emissions; the computer has determined the actual flow is below what it commanded. The most common reason is carbon buildup clogging the EGR valve or its passages. You may notice pinging/knocking, rough idle, or a check engine light, and the car will fail emissions testing. On RAM specifically, this code is documented across 2 models.
What causes P0401 on RAM vehicles?▼
Common causes on RAM: Carbon buildup clogging the EGR valve or passages, Stuck or faulty EGR valve, Blocked or restricted EGR ports/tubes, Faulty EGR temperature or position sensor, Faulty DPFE/EGR pressure sensor (on applicable systems). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0401 on a RAM?▼
Repair costs on RAM range from $40 to $2,500, depending on the specific model and root cause.
Which RAM models have P0401 documented?▼
Au7o has documented P0401 on 2 RAM models: 1500, ProMaster.